Circatidal-rhythm
Guides
Anurida
Anurida is a genus of springtails (Collembola) in the family Neanuridae, established in 1865 by Laboulbène. The genus has cosmopolitan distribution with species occupying diverse habitats including intertidal marine zones, river floodplains, riparian areas, and forest ecosystems. Well-studied species include the intertidal specialist Anurida maritima, which exhibits complex tidal-entrained behaviors, and the terrestrial A. granaria, which has documented mycophagous associations. The genus shows notable morphological diversity in chaetotaxy and eye reduction, with some species groups exhibiting cryptic genetic divergence despite morphological similarity.
Collembolaspringtailsintertidaltidal-behaviorcryptic-speciesendosymbiontsWolbachiaSpiroplasmadiapauseunivoltinemycophagychaetotaxyNeanuridaecosmopolitan-distributioncircatidal-rhythmegg-diapausesalt-marshriver-floodplainriparian-zoneforest-habitatBeringian-faunagenetic-divergence-without-morphological-changetidal-entrainmentaggregation-behaviorsexual-dimorphism-in-foragingstarvation-mortalityholometabolous-like-developmentsetal-reductionocelli-reductionhammerae-groupAnurida-maritima-species-groupLaboulbène-1865PoduromorphaNeanurinaePseudachorutinaeterrestrialmarine-intertidalfreshwater-ripariannutrient-cyclingorganic-matter-decompositionfungal-dispersalapothecia-feedingclay-wall-nestsair-filled-cavitiestidal-refugeweather-dependent-activitytemperature-dependent-diapause-terminationmitochondrial-genome-divergenceancient-circatidal-behaviorcytoplasmic-incompatibilitymale-killingType-V-cif-genesgenome-wide-differentiationPool-seq-phylogenomicsHolarctic-distributiontemperate-zone-adaptationoverwintering-eggsautumn-mortalityphysiological-stressforaging-efficiencylow-temperature-limitationtidal-inundation-responsebehavioral-synchronizationnest-constructionsexual-reproductioncolonial-aggregationfungal-associationPeziza-arvernensisriverinagranariaoctoculatahirsutaelegansreductanarlibisetosaVladivostok-Botanical-GardenPrimorsky-KraiPolandSouthern-BrazilNorth-western-EuropeUnited-KingdomThe-NetherlandsAndeanArcticSub-arcticCapeCaribbeanCentral-Australiaconiferous-broadleaved-forestprotected-forestvertical-clay-wallscreek-wallssalt-marsh-foragingmarsh-wanderingnest-marsh-exchangemolting-refugeegg-deposition-sitessexually-mature-aggregationhibernating-eggsspring-hatchingsummer-egg-layingautumn-diapause-terminationwinter-development-suppressionadult-deathstarvation-riskglycogen-depletionlipid-depletionbody-size-declinesluggishness-at-low-temperaturelimited-low-water-periodtemperate-survival-strategycosmopolitan-species-with-local-adaptationgenetic-crosses-neededsex-ratio-studies-neededendosymbiont-effects-unknownreproductive-manipulation-potentialselfish-genetic-elementsmaternal-inheritancephylogenomic-analysissingle-copy-orthologous-genesnuclear-genome-divergencemitochondrial-lineage-associationspecies-group-conceptmorphological-stasisevolutionary-divergencesystematic-revision-neededtribe-validityNeanurinae-subdivisionPseudachorutinae-placementhigher-rank-taxonomy-matchGBIF-recordsiNaturalist-observationsCatalogue-of-Life-acceptanceNCBI-taxonomyEntognathaHexapodaEukaryotaMetazoaAnimaliaArthropodaspringtail-biodiversitysoil-mesofaunaintertidal-invertebratemarine-terrestrial-transition-zoneestuarine-ecologytidal-flat-ecologyfloodplain-ecologyriparian-ecologyforest-floor-ecologymycophagous-collembolanfungal-feeding-springtailnutrient-cyclerdecomposerdetritivoreorganic-matter-processorecosystem-engineer-(nest-construction)microhabitat-specialisthabitat-partitionsexual-dimorphismbehavioral-plasticityenvironmental-cue-responsephototaxis-modificationthermotaxis-responsehydrotaxis-responseaggregation-pheromone-(inferred)social-behavior-(colonial)reproductive-behaviorcourtshipoviposition-site-selectionegg-guarding-(absent)diapause-evolutionlife-history-strategyunivoltinismsemelparity-(effective)annual-life-cycleseasonal-polyphenism-(absent)developmental-arrestcold-requirement-for-developmenttemperature-threshold5°C-diapause-terminationspring-warming-triggerphenologypopulation-dynamicsdemographymortality-factorstarvationenvironmental-stressclimate-sensitivityhabitat-specificityendemism-(some-species)cryptic-biodiversitymolecular-taxonomyintegrative-taxonomyphylogeographypopulation-geneticsgenomic-resourcesWolbachia-genomeSpiroplasma-genomebacterial-endosymbiosishost-microbe-interactionreproductive-parasitismmutualism-(unknown)commensalism-(unknown)symbiont-phylogenyhorizontal-gene-transfer-(absent-in-data)prophage-genescif-gene-evolutionType-V-clademale-killing-gene-absenceCI-gene-presencewmk-gene-presenceSpAID-absencebacterial-genome-reduction-(inferred)host-adaptationcoevolutionsymbiont-sharing-between-host-lineagesgenetic-divergence-with-symbiont-sharingspeciation-mechanismreproductive-isolationcytoplasmic-incompatibility-as-speciation-driver-(unlikely-given-identical-cif-sequences)alternative-speciation-mechanismsecological-speciationbehavioral-isolationhabitat-isolationtemporal-isolationgeographic-isolationallopatric-divergenceparapatric-divergencesympatric-divergence-(possible)cryptic-species-identification-challengemorphological-taxonomy-limitationsmolecular-systematics-necessityDNA-barcodinggenome-skimmingPool-seqphylogenomic-inferencespecies-delimitationintegrative-species-conceptoperational-taxonomic-unitevolutionary-significant-unitconservation-unitbiodiversity-assessmentfaunisticsbiogeographydispersal-abilitypassive-dispersalactive-dispersalhabitat-fidelitysite-fidelitynest-fidelityphilopatry-(inferred)population-structuregene-flowgenetic-differentiationisolation-by-distanceisolation-by-environmentlocal-adaptationphenotypic-plasticitygenetic-accommodationevolutionary-developmental-biologyevo-devosetal-developmentsensory-organ-developmenteye-reduction-evolutioncave-adaptation-(absent)soil-adaptationintertidal-adaptationdesiccation-resistance-(inferred)salinity-tolerancehypoxia-tolerance-(inferred)nest-air-pocket-maintenancerespiratory-adaptationcuticular-waterproofing-(inferred)osmoregulationion-regulationexcretory-systemMalpighian-tubules-(standard)labial-glandsdigestive-systemmidguthindgutfeeding-apparatusmaxillamandiblelabrumepipharynxhypopharynxmouthparts-entognathoushead-capsuleantennaesegment-numbersegment-fusionthoraxabdomenfurca-(absent-in-some-Neanuridae)tenaculumcollophoreventral-tubereticulate-patternpigmentationcolorationsize-variationbody-shapecylindrical-bodysetal-arrangementmacrosetaemicrosetaesensory-setaemechanoreceptorschemoreceptorshygroreceptorsthermoreceptorsphotoreceptorsocelli-structureeye-number-reductioneye-complete-loss-(some-species)pigment-losscuticular-granulationcuticular-tuberclescuticular-scalesbody-sclerotizationintersegmental-membranesappendage-structureleg-segmentationclaw-structureunguiculustenent-hairempodial-appendagetibiotarsusfemurtrochantercoxasubcoxaabdominal-segmentationtergite-structuresternite-structurepleurite-structuretergal-chaetotaxysternal-chaetotaxypleural-chaetotaxyaxial-setaeparaxial-setaemarginal-setaep-row-setaea-row-setaem-row-setaesetal-formulasetal-nomenclatureFjellberg-systemGisin-systemtaxonomic-stabilitynomenclatural-actstype-speciestype-localitytype-specimenoriginal-descriptionsubsequent-redescriptionsfaunal-revisionscatalogueschecklistsdatabasesGBIFiNaturalistNCBIBOLDCOLITISEncyclopedia-of-LifeWikipediaprimary-literaturetaxonomic-literatureecological-literaturephysiological-literaturegenomic-literaturesymbiont-literaturebehavioral-literatureentomologyacarologysoil-zoologymarine-biologyintertidal-ecologyestuarine-sciencelimnologyfreshwater-biologyterrestrial-ecologyforest-ecologyfungal-ecologymicrobial-ecologysymbiosis-researchevolutionary-biologypopulation-biologyconservation-biologybiodiversity-sciencesystematicsphylogeneticspaleontology-(absent)fossil-record-(absent)amber-inclusion-(possible-but-unreported)subfossil-(absent)quaternary-record-(absent)historical-ecologyanthropogenic-impactpollution-sensitivitybioindicator-potentialconservation-status-(unevaluated)IUCN-Red-List-(absent)habitat-protection-needsprotected-area-occurrenceinvasive-potential-(low)agricultural-pest-(absent)household-pest-(absent)economic-importance-(minimal)scientific-importance-(high)model-organism-potentialteaching-organismresearch-subjectbiodiversity-componentecosystem-service-providercultural-significance-(absent)traditional-knowledge-(absent)indigenous-knowledge-(absent)vernacular-names-(absent)etymologyAnurida-(etymology-unknown,-possibly-Greek-'an-'-without-+-'oura'-tail,-referring-to-reduced-furca)Laboulbène1865historical-taxonomyclassical-taxonomymodern-taxonomyfuture-research-needstaxonomic-revisionphylogenetic-analysispopulation-genomic-studyfunctional-genomic-studydevelopmental-studyphysiological-studybehavioral-studyecological-studysymbiont-studyconservation-studyAnurida maritima
seashore springtail, rock springtail
Anurida maritima is a cosmopolitan springtail confined to the intertidal zone, where it forms dense aggregations of up to several hundred individuals on rock-pool surfaces. This wingless collembolan exhibits unique adaptations to marine conditions, including a vestigial furcula that prevents jumping and hydrophobic body hairs that enable it to remain on water surfaces. The species demonstrates complex behavioral rhythms synchronized with tidal cycles and survives winter through egg diapause. Recent genetic studies have revealed cryptic speciation within this morphospecies, with distinct mitochondrial and nuclear lineages now recognized.
Emerita talpoida
Atlantic mole crab, Atlantic sand crab
Emerita talpoida is a mole crab in the family Hippidae, endemic to the western Atlantic Ocean. It inhabits the swash zone of sandy beaches, where it burrows backwards into sand and filter-feeds using feathery antennae. The species exhibits a circatidal rhythm in activity with a ~12.4 hour period, with smaller crabs distributed higher intertidally than larger ones. Life history is flexible, with reproductive timing and growth patterns varying in response to environmental conditions.