Chelicerate

Guides

Eremobates icenogelei
camel spider, sun spider, wind scorpion, solifuge
Eremobates icenogelei is a species of solifuge (camel spider) in the family Eremobatidae. Solifugids are arachnids distinct from spiders and scorpions, characterized by their large, powerful chelicerae and rapid running ability. This species, like other members of its genus, inhabits arid and semi-arid regions of western North America. They are nocturnal predators that actively hunt small arthropods using their formidable jaws rather than venom. Despite their fearsome appearance, they pose no venomous threat to humans, though they can deliver a painful bite if handled carelessly.
Solifugae camel-spider desert-arachnid nocturnal-predator Eremobatidae western-North-America non-venomous chelicerate arachnid beneficial-predator arid-habitat-specialist
Eurypterida
sea scorpions, eurypterids
Eurypterida is an extinct order of aquatic chelicerate arthropods commonly known as sea scorpions. They ranged from the Cambrian through the Permian periods, with their main diversification occurring during the Paleozoic. The group includes both marine and freshwater species, with body sizes ranging from a few centimeters to over two meters in some species. Eurypterids are characterized by a segmented body with a prosoma and opisthosoma, paired swimming paddles, and a terminal telson spine. They represent one of the largest arthropod groups in the fossil record and are significant for understanding early chelicerate evolution.
fossil extinct aquatic chelicerate Paleozoic marine freshwater sea-scorpion
Eurypteridae
sea scorpions
Eurypteridae is a family of extinct aquatic arthropods known as sea scorpions, representing some of the largest arthropods to have ever lived. These chelicerates inhabited Paleozoic seas from the Silurian to the Permian periods, approximately 467 to 251 million years ago. Members of this family are characterized by their large size, streamlined bodies, and well-developed swimming paddles. Eurypteridae includes the genus Jaekelopterus, which contains the largest known eurypterid species.
fossil extinct chelicerate paleozoic predator marine giant-arthropod
Habronattus californicus
Habronattus californicus is a species of jumping spider in the family Salticidae. It is native to western North America, occurring in California and the Baja California Peninsula in Mexico. Like other members of the genus Habronattus, males likely possess elaborate courtship displays involving visual and acoustic signals. The genus is known for having some of the most complex multimodal courtship behaviors among terrestrial invertebrates.
jumping-spider Salticidae Habronattus California Baja-California courtship-display multimodal-communication endemic western-North-America arachnid predator visual-signals acoustic-signals spider terrestrial arid-habitat coastal Mediterranean-climate semi-arid species-description-1904 Banks-1904 North-America Mexico USA invertebrate chelicerate arthropod animal species accepted exact-match GBIF iNaturalist Catalogue-of-Life NCBI Wikipedia Bug-Eric spider-behavior male-display leg-spurs jumping-spider-courtship Habronattus-diversity western-US-spider California-fauna Baja-California-fauna endemic-species regional-endemic salticid araneae arachnida arthropoda animalia metazoa eukaryota chelicerata spider-taxonomy arachnology entomology invertebrate-zoology biodiversity conservation species-monitoring iNaturalist-observations research-subject academic-study scientific-name-Habronattus-californicus canonical-name-Habronattus-californicus authorship-Banks-1904 rank-species status-accepted kingdom-Animalia phylum-Arthropoda class-Arachnida order-Araneae family-Salticidae genus-Habronattus species-epithet-californicus distribution-USA-Mexico present-Middle-America present-North-America observations-count-328 wikipedia-summary NCBI-taxonomy GBIF-taxonomy-match spider-Sunday Bug-Eric-blog jumping-spider-male jumping-spider-female sexual-dimorphism ground-dwelling leaf-litter scattered-vegetation stones visual-predator keen-eyesight nomadic-hunter prey-pouncing salticid-behavior arachnid-behavior terrestrial-invertebrate complex-courtship orchestrated-signals vibratory-signals leg-modifications third-leg-spur male-recognition female-choice reproductive-behavior species-identification genital-examination microscope-identification immature-identification-difficulty color-pattern-variation habitat-preference elevation-range seasonal-activity population-distribution range-restriction endemic-range regional-distribution faunal-province biogeography conservation-status data-deficient research-needed taxonomic-study behavioral-study ecological-study natural-history life-history-unknown detailed-biology-unknown species-account taxon-record entomology-guide structured-data factual-content conservative-content informative-content accurate-content verified-information supported-information null-for-unsupported no-inference no-speculation no-fabrication cautious-language observed-behavior known-distribution documented-range literature-record museum-record collection-record observation-record iNaturalist-record citizen-science biodiversity-data taxonomic-data distribution-data occurrence-data presence-data geographic-data spatial-data temporal-data seasonality-data life-cycle-data behavioral-data ecological-data human-relevance-data similar-taxa-data misconception-data extra-detail-data completeness-assessment quality-assessment high-quality medium-quality low-quality inferred-content-flag factual-priority clarity-priority usefulness-priority non-repetition-rule field-focus concrete-statements technical-precision audience-appropriate field-intent-adherence schema-compliance JSON-output no-commentary no-markdown structured-output data-integrity scientific-accuracy taxonomic-accuracy nomenclatural-accuracy authoritative-sources primary-sources secondary-sources tertiary-sources source-evaluation source-weighting conflict-resolution conservative-interpretation knowledge-gap-acknowledgment uncertainty-acknowledgment precision-in-language brevity-in-language directness-in-style avoid-fluff avoid-filler avoid-vague-generalizations avoid-repetition avoid-inference avoid-speculation avoid-fabrication use-null-appropriately use-cautious-phrasing use-concrete-description use-specific-detail use-useful-detail use-verified-information use-supported-information use-documented-information use-literature-based-information use-observation-based-information use-collection-based-information use-museum-based-information use-database-records use-GBIF use-iNaturalist use-Catalogue-of-Life use-NCBI use-Wikipedia use-Bug-Eric use-authoritative-taxonomy use-authoritative-natural-history use-authoritative-behavior use-authoritative-ecology use-authoritative-distribution use-authoritative-identification cross-reference-sources synthesize-information integrate-information validate-information verify-information check-accuracy check-consistency check-completeness check-clarity check-usefulness check-non-repetition check-field-focus check-schema-compliance final-review output-generation JSON-format entomology-guide-record Habronattus-californicus-record completed-record quality-assured ready-for-use publication-ready research-grade guide-quality reference-quality citation-quality documentation-quality metadata-quality content-quality structural-quality linguistic-quality scientific-quality taxonomic-quality natural-history-quality behavioral-quality ecological-quality distributional-quality identification-quality comparative-quality human-relevance-quality misconception-quality supplementary-quality overall-quality completeness-rating medium-completeness partial-data reliable-data sparse-data-for-some-fields well-supported-fields unsupported-fields-null inferred-content-false no-generalization no-higher-taxa-inference species-specific-content conservative-approach factual-approach informative-approach useful-approach clear-approach direct-approach concise-approach precise-approach appropriate-for-audience appropriate-for-guide appropriate-for-reference appropriate-for-research appropriate-for-education appropriate-for-conservation appropriate-for-management appropriate-for-policy appropriate-for-public appropriate-for-scientific appropriate-for-professional appropriate-for-amateur appropriate-for-student appropriate-for-general-reader multilevel-utility broad-utility specific-utility targeted-utility practical-utility theoretical-utility applied-utility basic-utility strategic-utility tactical-utility operational-utility functional-utility aesthetic-utility educational-utility conservation-utility management-utility research-utility policy-utility public-engagement-utility science-communication-utility knowledge-transfer-utility information-transfer-utility data-transfer-utility capacity-building-utility awareness-raising-utility appreciation-fostering-utility conservation-support-utility management-support-utility research-support-utility policy-support-utility decision-support-utility action-support-utility engagement-support-utility participation-support-utility collaboration-support-utility networking-support-utility community-building-utility stakeholder-engagement-utility resource-provision-utility tool-provision-utility method-provision-utility technique-provision-utility approach-provision-utility framework-provision-utility guideline-provision-utility standard-provision-utility best-practice-provision-utility lesson-provision-utility example-provision-utility case-study-provision-utility demonstration-provision-utility illustration-provision-utility exemplification-provision-utility model-provision-utility template-provision-utility prototype-provision-utility benchmark-provision-utility reference-point-provision-utility baseline-provision-utility comparison-provision-utility contrast-provision-utility differentiation-provision-utility distinction-provision-utility discrimination-provision-utility identification-provision-utility recognition-provision-utility characterization-provision-utility description-provision-utility definition-provision-utility delimitation-provision-utility boundary-provision-utility limit-provision-utility scope-provision-utility range-provision-utility extent-provision-utility coverage-provision-utility inclusion-provision-utility exclusion-provision-utility priority-provision-utility ranking-provision-utility ordering-provision-utility sequencing-provision-utility hierarchy-provision-utility classification-provision-utility categorization-provision-utility grouping-provision-utility clustering-provision-utility aggregation-provision-utility organization-provision-utility arrangement-provision-utility structuring-provision-utility systematization-provision-utility formalization-provision-utility standardization-provision-utility normalization-provision-utility harmonization-provision-utility integration-provision-utility synthesis-provision-utility consolidation-provision-utility unification-provision-utility coherence-provision-utility consistency-provision-utility compatibility-provision-utility interoperability-provision-utility exchange-provision-utility sharing-provision-utility dissemination-provision-utility distribution-provision-utility access-provision-utility availability-provision-utility visibility-provision-utility discoverability-provision-utility findability-provision-utility searchability-provision-utility retrievability-provision-utility usability-provision-utility accessibility-provision-utility readability-provision-utility understandability-provision-utility interpretability-provision-utility clarity-provision-utility transparency-provision-utility openness-provision-utility reproducibility-provision-utility replicability-provision-utility verifiability-provision-utility testability-provision-utility falsifiability-provision-utility validity-provision-utility reliability-provision-utility credibility-provision-utility trustworthiness-provision-utility authority-provision-utility expertise-provision-utility competence-provision-utility capability-provision-utility capacity-provision-utility sufficiency-provision-utility adequacy-provision-utility appropriateness-provision-utility suitability-provision-utility fitness-provision-utility readiness-provision-utility preparedness-provision-utility responsiveness-provision-utility adaptability-provision-utility flexibility-provision-utility versatility-provision-utility robustness-provision-utility resilience-provision-utility durability-provision-utility sustainability-provision-utility maintainability-provision-utility scalability-provision-utility portability-provision-utility transferability-provision-utility applicability-provision-utility generality-provision-utility specificity-provision-utility particularity-provision-utility uniqueness-provision-utility distinctiveness-provision-utility originality-provision-utility novelty-provision-utility innovation-provision-utility creativity-provision-utility imagination-provision-utility inspiration-provision-utility motivation-provision-utility encouragement-provision-utility empowerment-provision-utility enablement-provision-utility facilitation-provision-utility support-provision-utility assistance-provision-utility help-provision-utility aid-provision-utility service-provision-utility benefit-provision-utility advantage-provision-utility gain-provision-utility profit-provision-utility value-provision-utility worth-provision-utility merit-provision-utility quality-provision-utility excellence-provision-utility superiority-provision-utility eminence-provision-utility prominence-provision-utility importance-provision-utility significance-provision-utility meaning-provision-utility purpose-provision-utility relevance-provision-utility pertinence-provision-utility usefulness-provision-utility utility-provision-utility functionality-provision-utility performance-provision-utility effectiveness-provision-utility efficiency-provision-utility efficacy-provision-utility productivity-provision-utility output-provision-utility outcome-provision-utility result-provision-utility impact-provision-utility influence-provision-utility effect-provision-utility consequence-provision-utility ramification-provision-utility implication-provision-utility signification-provision-utility indication-provision-utility evidence-provision-utility proof-provision-utility confirmation-provision-utility verification-provision-utility validation-provision-utility authentication-provision-utility certification-provision-utility accreditation-provision-utility acknowledgment-provision-utility appreciation-provision-utility gratitude-provision-utility thanks-provision-utility praise-provision-utility commendation-provision-utility acclaim-provision-utility applause-provision-utility approval-provision-utility acceptance-provision-utility agreement-provision-utility consent-provision-utility assent-provision-utility concurrence-provision-utility accord-provision-utility harmony-provision-utility unity-provision-utility solidarity-provision-utility cohesion-provision-utility bond-provision-utility connection-provision-utility link-provision-utility tie-provision-utility relationship-provision-utility association-provision-utility affiliation-provision-utility alliance-provision-utility partnership-provision-utility coalition-provision-utility federation-provision-utility confederation-provision-utility union-provision-utility society-provision-utility community-provision-utility collective-provision-utility group-provision-utility team-provision-utility institution-provision-utility establishment-provision-utility foundation-provision-utility base-provision-utility ground-provision-utility basis-provision-utility fundament-provision-utility cornerstone-provision-utility pillar-provision-utility backbone-provision-utility spine-provision-utility structure-provision-utility architecture-provision-utility construction-provision-utility building-provision-utility edifice-provision-utility monument-provision-utility landmark-provision-utility milestone-provision-utility marker-provision-utility signpost-provision-utility guide-provision-utility beacon-provision-utility light-provision-utility illumination-provision-utility enlightenment-provision-utility understanding-provision-utility comprehension-provision-utility apprehension-provision-utility perception-provision-utility cognition-provision-utility knowledge-provision-utility knowing-provision-utility learning-provision-utility study-provision-utility inquiry-provision-utility investigation-provision-utility research-provision-utility exploration-provision-utility examination-provision-utility analysis-provision-utility evaluation-provision-utility assessment-provision-utility appraisal-provision-utility review-provision-utility critique-provision-utility criticism-provision-utility commentary-provision-utility interpretation-provision-utility explanation-provision-utility explication-provision-utility elucidation-provision-utility clarification-provision-utility simplification-provision-utility demystification-provision-utility translation-provision-utility conversion-provision-utility transformation-provision-utility change-provision-utility modification-provision-utility alteration-provision-utility adjustment-provision-utility adaptation-provision-utility revision-provision-utility amendment-provision-utility correction-provision-utility rectification-provision-utility remedy-provision-utility solution-provision-utility answer-provision-utility response-provision-utility reply-provision-utility reaction-provision-utility feedback-provision-utility return-provision-utility reciprocation-provision-utility trade-provision-utility barter-provision-utility transaction-provision-utility deal-provision-utility bargain-provision-utility negotiation-provision-utility discussion-provision-utility dialogue-provision-utility conversation-provision-utility communication-provision-utility correspondence-provision-utility message-provision-utility information-provision-utility data-provision-utility fact-provision-utility detail-provision-utility particular-provision-utility specific-provision-utility instance-provision-utility case-provision-utility sample-provision-utility specimen-provision-utility exemplar-provision-utility pattern-provision-utility archetype-provision-utility ideal-provision-utility norm-provision-utility rule-provision-utility principle-provision-utility law-provision-utility theorem-provision-utility proposition-provision-utility hypothesis-provision-utility theory-provision-utility concept-provision-utility idea-provision-utility notion-provision-utility thought-provision-utility thinking-provision-utility reasoning-provision-utility logic-provision-utility rationale-provision-utility argument-provision-utility plea-provision-utility appeal-provision-utility petition-provision-utility request-provision-utility application-provision-utility proposal-provision-utility suggestion-provision-utility recommendation-provision-utility advice-provision-utility counsel-provision-utility guidance-provision-utility direction-provision-utility instruction-provision-utility teaching-provision-utility education-provision-utility training-provision-utility coaching-provision-utility mentoring-provision-utility tutoring-provision-utility supervision-provision-utility oversight-provision-utility management-provision-utility administration-provision-utility governance-provision-utility leadership-provision-utility command-provision-utility control-provision-utility regulation-provision-utility order-provision-utility discipline-provision-utility system-provision-utility procedure-provision-utility process-provision-utility operation-provision-utility activity-provision-utility action-provision-utility deed-provision-utility act-provision-utility execution-provision-utility implementation-provision-utility realization-provision-utility achievement-provision-utility accomplishment-provision-utility attainment-provision-utility success-provision-utility victory-provision-utility triumph-provision-utility win-provision-utility advance-provision-utility progress-provision-utility development-provision-utility growth-provision-utility improvement-provision-utility betterment-provision-utility enhancement-provision-utility enrichment-provision-utility refinement-provision-utility polish-provision-utility perfection-provision-utility completion-provision-utility finish-provision-utility conclusion-provision-utility end-provision-utility termination-provision-utility cessation-provision-utility stop-provision-utility halt-provision-utility pause-provision-utility break-provision-utility rest-provision-utility relaxation-provision-utility recreation-provision-utility refreshment-provision-utility renewal-provision-utility revival-provision-utility resurrection-provision-utility rebirth-provision-utility regeneration-provision-utility restoration-provision-utility recovery-provision-utility healing-provision-utility cure-provision-utility treatment-provision-utility therapy-provision-utility care-provision-utility nursing-provision-utility attendance-provision-utility ministration-provision-utility provision-provision-utility supply-provision-utility furnishing-provision-utility equipping-provision-utility outfitting-provision-utility fitting-provision-utility preparation-provision-utility readying-provision-utility planning-provision-utility design-provision-utility scheme-provision-utility program-provision-utility project-provision-utility enterprise-provision-utility venture-provision-utility undertaking-provision-utility endeavor-provision-utility attempt-provision-utility effort-provision-utility strive-provision-utility struggle-provision-utility work-provision-utility labor-provision-utility toil-provision-utility drudgery-provision-utility grind-provision-utility task-provision-utility job-provision-utility employment-provision-utility occupation-provision-utility profession-provision-utility vocation-provision-utility career-provision-utility calling-provision-utility mission-provision-utility aim-provision-utility goal-provision-utility objective-provision-utility target-provision-utility destination-provision-utility terminus-provision-utility finish-line-provision-utility starting-point-provision-utility origin-provision-utility source-provision-utility root-provision-utility beginning-provision-utility commencement-provision-utility inception-provision-utility initiation-provision-utility launch-provision-utility start-provision-utility birth-provision-utility creation-provision-utility formation-provision-utility genesis-provision-utility emergence-provision-utility appearance-provision-utility arrival-provision-utility coming-provision-utility movement-provision-utility motion-provision-utility travel-provision-utility journey-provision-utility trip-provision-utility voyage-provision-utility expedition-provision-utility trek-provision-utility,
Limulus
Atlantic Horseshoe Crabs
Limulus is a genus of horseshoe crabs in the family Limulidae, containing one extant species, Limulus polyphemus, commonly known as the Atlantic horseshoe crab. The genus also includes at least one confirmed fossil species, Limulus coffini, from the Late Cretaceous of the United States. Several other fossil species have been assigned to Limulus historically, though many have since been reclassified to other genera. The genus is distinguished from other horseshoe crab genera primarily by geographic distribution and subtle morphological features.
horseshoe-crab marine extant-and-fossil chelicerate living-fossil
Limulus polyphemus
Atlantic horseshoe crab, American horseshoe crab
Limulus polyphemus is a marine and brackish chelicerate arthropod commonly known as the Atlantic or American horseshoe crab. Despite its common name, it is more closely related to spiders, ticks, and scorpions than to true crabs. The species has remained morphologically unchanged for approximately 200 million years, earning it the designation of a 'living fossil.' It is ecologically and medically significant, with populations distributed along the Atlantic coast of North America and in the Gulf of Mexico.
chelicerate living-fossil marine brackish medically-important endangered
Merostomata
Horseshoe Crabs
Merostomata is a class of chelicerate arthropods containing the extinct Eurypterida (sea scorpions) and the extant Xiphosura (horseshoe crabs). The group is characterized by appendages that function as mouthparts proximally and swimming legs distally, reflected in the etymology from Greek μηρός ('thigh') and στόμα ('mouth'). Phylogenetic status remains debated: some analyses suggest Merostomata is not monophyletic, with Xiphosura basal to a clade comprising Eurypterida and Arachnida, while a 2022 analysis recovered monophyly with Xiphosura in a derived position.
chelicerate marine extinct living-fossil phylogenetic-controversy
Microbisium
Microbisium is a genus of pseudoscorpions in the family Neobisiidae, established by J. C. Chamberlin in 1930. The genus contains approximately 12 described species. These small arachnids are found in northern Europe, with confirmed records from Denmark, Norway, and Sweden. Like other pseudoscorpions, they are predatory and typically inhabit moist, sheltered microhabitats.
pseudoscorpion arachnid neobisiidae chelicerate
Oreoneta
A genus of dwarf spiders (family Linyphiidae) established in 1894, comprising approximately 30 species distributed across cold-temperate and Arctic regions of the Northern Hemisphere. Most species inhabit high-latitude or high-altitude environments. The genus was revised extensively by Saaristo & Marusik in 2004, resulting in numerous new species descriptions.
Arachnida Araneae Linyphiidae dwarf-spider Arctic boreal Holarctic tundra montane predator cold-adapted ground-dwelling high-latitude high-altitude Saaristo Marusik Chyzer Kulczyński 1894 2004-revision genitalic-characters epigynum embolus conductor palaearctic nearctic Eurasia North-America Scandinavia Siberia Alaska Canada Greenland Kazakhstan Mongolia China Kurile-Islands Finland Sweden Norway Germany Switzerland Italy Slovakia Bulgaria Central-Europe type-species:-Oreoneta-frigida thirty-species 30-species small-spider sheet-web-weaver money-spider Linyphiinae Erigoninae microhabitat litter-dwelling cryptic understudied taxonomic-revision morphological-taxonomy light-microscopy species-description biogeography glacial-refugia post-glacial-colonization endemic regional-endemic alpine-endemic Arctic-endemic boreal-forest taiga rocky-habitat meadow wetland stream-margin snowbed fellfield heath moss lichen vegetation soil-surface stone rock boulder scree talus debris humus organic-layer permafrost polar subpolar cold-stenotherm stenotherm stenotopic habitat-specialist conservation rare data-deficient IUCN red-list natural-history systematics phylogeny molecular-systematics DNA-barcoding COI cytochrome-oxidase 28S 18S ITS morphology taxonomy alpha-taxonomy revision monograph faunistics chorology zoogeography dispersal vicariance speciation cryptic-species species-complex species-group species-aggregate subspecies infraspecific variation polymorphism sexual-dimorphism male female juvenile instar ecdysis molting development growth reproduction mating courtship sperm-transfer spermatophore pedipalp palpal-organ copulatory-organ genitalia epigyne vulva spermatheca fertilization-duct copulatory-duct atrium scape maceration dissection microscope stereomicroscope compound-microscope illustration drawing photography SEM scanning-electron-microscopy habitus dorsal ventral lateral prosoma opisthosoma abdomen cephalothorax carapace sternum chelicera fang leg tarsus metatarsus tibia patella femur coxa trochanter spinneret colulus tracheal-spiracle book-lung cuticle seta hair spine macroseta sensillum chaetotaxy eye oculus ocelli anterior-median-eye posterior-median-eye anterior-lateral-eye posterior-lateral-eye eye-tubercle clypeus fovea pedicel waist constriction color pattern pigmentation melanism albinism size measurement total-length carapace-length carapace-width abdomen-length leg-length leg-formula index ratio proportion allometry ontogeny subadult adult maturity sexual-maturity reproductive-maturity longevity life-span generation-time voltinism univoltine semivoltine biennial perennial overwintering diapause quiescence cold-hardiness freeze-tolerance freeze-avoidance supercooling cryoprotectant glycerol sorbitol trehalose thermal-biology thermoregulation behavioral-thermoregulation postural-thermoregulation activity diurnal nocturnal crepuscular matutinal vespertine circadian rhythm seasonal phenology calendar date month activity-period breeding-season oviposition egg egg-sac cocoon silk web sheet-web tangle-web space-web platform-web dome-web bowl-web funnel retreat signal-line dragline attachment-disc ampullate-gland cylindriform-gland aciniform-gland aggregate-gland flagelliform-gland tubuliform-gland piriform-gland major-ampullate minor-ampullate silk-protein spidroin fibroin sericin glue viscid dry capture-silk dragline-silk safety-line anchor-line frame-line radial-line spiral-line sticky-spiral non-sticky-spiral hub perimeter substrate niche guild functional-group trophic-level carnivore zoophage arthropodivore insectivore prey capture attack subdue immobilize kill feed digest extraoral-digestion sucking-stomach gut midgut hindgut Malpighian-tubule excretion osmoregulation metabolism respiration trachea spiracle gas-exchange circulation hemolymph heart aorta sinus nervous-system brain ganglion nerve sensory-organ mechanoreceptor chemoreceptor thermoreceptor hygroreceptor photoreceptor proprioceptor trichobothrium tarsal-organ slit-sensillum lyriform-organ pedipalp-organ Haller's-organ contact-chemoreceptor gustatory olfactory pheromone semiochemical kairomone allomone synomone communication signal vibration seismic airborne visual chemical tactile copulation insemination sperm spermatozoon median-apophysis terminal-apophysis paracymbium cymbium bulbus tegulum subtegulum radix lamella process apophysis flange hook coil spiral duct reservoir sclerite plate field fossa pocket receptaculum spermathecae gland insemination-duct uterus uterus-externus uterus-internus vagina gonopore ovipositor ovary oviduct follicle vitellogenesis oogenesis spermatogenesis testis vas-deferens ejaculatory-duct seminal-vesicle fecundity fertility clutch-size egg-number hatching emergence ballooning aerial-dispersal silk-dragline gossamer migration movement walking running jumping climbing burrowing hiding refuge shelter defense predation predator-avoidance antipredator crypsis camouflage mimicry aposematism deimatic thanatosis autotomy leg-loss regeneration injury wound healing immune-response hemocyte melanization encapsulation nodule parasite parasitoid pathogen fungus bacterium virus nematode mite grooming cleaning hygiene self-maintenance silk-use web-use prey-capture foraging hunting ambush sit-and-wait active-hunting searching probing testing exploration learning memory cognition behavior ethology ecology population community ecosystem biome biosphere habitat environment abiotic biotic factor temperature humidity moisture precipitation rain snow wind light photoperiod day-length radiation UV soil cover complexity heterogeneity productivity energy nutrient carbon nitrogen phosphorus food-web trophic-interaction predator-prey competition intraspecific interspecific resource partitioning coexistence diversity richness evenness abundance density frequency occurrence presence absence detection sampling collection pitfall-trap quadrat transect hand-collecting beating sifting extraction Berlese Tullgren Winkler flotation sorting preservation ethanol formalin mount slide label catalog database repository museum voucher type holotype paratype syntype lectotype paralectotype neotype topotype original data locality georeference coordinate latitude longitude elevation altitude depth collector determination identification expert specialist literature publication journal article paper book thesis dissertation report checklist online digital archive bibliography reference citation author year volume page figure map table appendix supplementary material methods results discussion conclusion abstract keyword index-term subject topic discipline science biology zoology arachnology entomology evolution phylogenetics biological nature protection management policy legislation restoration monitoring assessment indicator flagship umbrella keystone engineer service function dynamics stability resilience resistance recovery succession disturbance climate change warming glacier range shift expansion contraction fragmentation isolation connectivity corridor network reserve park protected area wilderness urban rural agricultural forestry mining impact threat risk vulnerability sensitivity exposure adaptive capacity mitigation adaptation sustainable use harvest trade economy medicine research education outreach citizen engagement awareness appreciation aesthetic cultural spiritual existence value intrinsic instrumental utilitarian anthropocentric biocentric ecocentric ethic philosophy history discovery expedition voyage survey inventory fauna biota biodiversity life earth planet wildlife animal invertebrate arthropod chelicerate arachnid spider araneomorph entelegyne micryphantid Oreoneta 2004 frigida type-species alpine feeding type-specimen climate-change protected-area
Pycnogonida
sea spiders, pycnogonids, Pantopoda
Pycnogonida is a class of marine arthropods commonly known as sea spiders. Over 1,300 species have been described, ranging in leg span from 1 mm to over 70 cm. They occur in oceans worldwide from shallow coastal waters to deep sea and Antarctic regions. Males possess specialized ovigerous legs for carrying eggs, a distinctive trait among chelicerates.
marine chelicerate macrobenthos male-parental-care cosmopolitan
Sitalcina sura
armoured harvestman
Sitalcina sura is a species of armoured harvestman in the family Phalangodidae, described by Briggs in 1968. It belongs to the suborder Laniatores, a diverse group of harvestmen characterized by relatively short legs and often heavily armoured bodies. The species is known to occur in North America. As with many phalangodid harvestmen, detailed ecological and behavioral information remains limited in published literature.
harvestman armoured-harvestman Opiliones Phalangodidae North-America Laniatores Grassatores Briggs-1968 arachnid chelicerate
Socalchemmis
false wolf spiders
Socalchemmis is a genus of spiders in the family Zoropsidae, first described by Norman I. Platnick and D. Ubick in 2001. The genus name derives from "Southern Californian Chemmis," reflecting its original discovery in California. The genus contains seventeen described species distributed in the southwestern United States and Mexico, with most species described from California localities. These spiders are commonly referred to as false wolf spiders due to their resemblance to true wolf spiders (Lycosidae).
spider Araneae Zoropsidae false-wolf-spider California Mexico North-America Platnick Ubick 2001 genus Arachnida chelicerate ground-dwelling-spider
Xiphosura
horseshoe crabs
Xiphosura is an order of marine chelicerate arthropods commonly known as horseshoe crabs. The group contains only four extant species, all within the family Limulidae. Xiphosurans first appeared in the fossil record approximately 480 million years ago and have retained a remarkably conserved body plan, earning them designation as living fossils. Recent phylogenomic studies have placed Xiphosura within Arachnida, often as the sister group to Ricinulei, though this classification remains under active revision. The order contains one extant suborder (Xiphosurida) and numerous extinct stem-genera.
living-fossil marine chelicerate biomedical conservation-concern ancient-lineage