Zoonosis
Guides
Amblyomma triste
Amblyomma triste is a hard tick species first described by Koch in 1844. It is the primary vector of Rickettsia parkeri, the causative agent of a spotted fever group rickettsiosis with symptoms resembling Rocky Mountain spotted fever. The species is the sole tick responsible for human tick-borne disease in Uruguay and a significant vector in Argentina and Brazil. Though historically considered restricted to South America, specimens have been documented in the United States (Arizona and Texas) and Mexico, where they were long misidentified as the morphologically similar Amblyomma maculatum.
Carios
Carios is a genus of soft ticks in the family Argasidae, comprising eight recognized species. Members of this genus are ectoparasites primarily associated with bats, with a cosmopolitan distribution spanning the Palearctic, Nearctic, and other regions. The genus is distinguished by morphological and ecological adaptations for life in bat roosts. Several species have documented medical significance due to aggressive biting behavior and potential pathogen transmission.
Carios kelleyi
Carios kelleyi is a soft tick (family Argasidae) that parasitizes bats, primarily the big brown bat (Eptesicus fuscus). First described in 1941, this species has been documented across much of North America and has been recorded in at least 29 of the 48 conterminous United States, plus Canada and Cuba. The species has gained attention due to its association with human dwellings when bats roost in attics and structures, and its potential to bite humans when primary bat hosts are removed. Recent studies have identified rickettsial agents in C. kelleyi, including Rickettsia lusitaniae (first U.S. detection), 'Candidatus Rickettsia andeanae', and a Rickettsia parkeri-like agent, raising public health concerns about its vector potential.
Ceratophyllidae
Rodent and Bird Fleas
Ceratophyllidae is a family of fleas (Siphonaptera) comprising ectoparasites that primarily infest rodents and birds. The family contains two subfamilies: one with over 40 genera and another with only three. Members are blood-feeding parasites with documented associations spanning multiple host groups including rodents (Peromyscus, Neotoma), birds, and occasionally marsupials such as the Virginia opossum. Several species within this family have been implicated as potential vectors for zoonotic pathogens.
Ctenocephalides
cat fleas, dog fleas
Ctenocephalides is a genus of fleas in the family Pulicidae, tribe Archaeopsyllini, containing approximately 13 species and subspecies worldwide. The genus includes two cosmopolitan species of major veterinary and medical importance: C. felis (cat flea) and C. canis (dog flea). These fleas are obligate hematophagous ectoparasites infesting domestic dogs and cats, with C. felis recognized as the most prevalent and economically significant external parasite of companion animals globally. Members of this genus also parasitize diverse wild hosts including foxes, civets, jackals, hares, hyraxes, ground squirrels, and hedgehogs.
Eustala
humpbacked orb-weavers
Eustala is a genus of orb-weaver spiders in the family Araneidae, first described by Eugène Simon in 1895. As of November 2024, the genus contains 87 species distributed primarily across the Americas, from the United States through Central America to South America, with highest diversity in Brazil, Uruguay, and Argentina. Several species have been documented exhibiting specialized ecological relationships, including myrmecophily (living among ants) in Central American species that inhabit ant-defended acacia plants. The genus includes the well-known humpbacked orb-weaver, Eustala anastera, found across North and Central America.
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htperchroostnestdenburrowtunneldigexcavateminequarryextractremoveeliminateeradicateexterminatedestroydemolishruinwreckdamageharminjurehurtwoundmaimcripplelamedisableincapacitateparalyzestunshockastonishamazeastoundstaggerstupefydazebewilderconfusepuzzleperplexbafflemystifyenigmaHaemaphysalis leporispalustris
rabbit tick, grouse tick
Haemaphysalis leporispalustris, commonly known as the rabbit tick, is a hard tick (family Ixodidae) with one of the widest distributions of any New World tick species, ranging from Alaska to Argentina. It is a three-host tick specialized on lagomorph hosts (rabbits and hares), with larvae also frequently found on ground-dwelling birds. Despite rarely feeding on humans, it serves as a vector for several pathogens affecting wildlife and domestic animals, including Rickettsia rickettsii, Coxiella burnetii, and Francisella tularensis. A newly recognized human pathogen, Rickettsia lanei, has been associated with this tick species.
Hippobosca longipennis
dog fly, louse fly, blind fly
Hippobosca longipennis is an obligate blood-feeding ectoparasitic fly in the family Hippoboscidae. It primarily infests wild and domestic carnivores, particularly canids and hyaenids, but has been recorded on felids and occasionally humans. The species is larviparous, with females producing 10–15 larvae during a lifetime of four to five months. It serves as an intermediate host for the filarial nematode Dipetalonema dracunculoides (now Acanthocheilonema dracunculoides) and has been implicated as a potential vector for other pathogens. Native to Africa, it has spread to the Middle East, Asia, and parts of Europe through transport on zoo animals and domestic dogs.
Ixodes
hard-bodied ticks, blacklegged ticks, deer ticks
Ixodes is a genus of hard-bodied ticks (family Ixodidae) comprising approximately 274 species with a near-cosmopolitan distribution. It is the sole representative of the Prostriata clade, distinguished from Metastriata by an anal groove that loops anterior to the anus. Many species serve as important disease vectors, transmitting pathogens including Borrelia burgdorferi (Lyme disease), Babesia microti (babesiosis), and Anaplasma phagocytophilum (anaplasmosis). Some species, notably Ixodes holocyclus, inject neurotoxins that can cause tick paralysis.
Ixodes affinis
Ixodes affinis is a hard-bodied tick species distributed across the southeastern United States, Mexico, Central America, and South America. Unlike its congener Ixodes scapularis, this species does not bite humans but serves as a competent vector for Borrelia burgdorferi sensu stricto, the causative agent of Lyme disease. Immature stages feed on birds and small mammals, while adults parasitize larger mammals including deer and dogs. Its expanding range into southeastern Virginia and association with migratory birds has raised concerns about its role in pathogen dispersal.
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marxi
Squirrel Tick
Ixodes marxi, commonly known as the squirrel tick, is a hard tick species in the family Ixodidae. It is a documented vector of Powassan virus and has been observed to transmit this pathogen to humans. The species is distributed across multiple U.S. states and Canadian provinces. Nymphal stages have been recorded questing on vegetation.
Ixodes pacificus
Western black-legged tick, Western blacklegged tick
Ixodes pacificus, the western black-legged tick, is a hard tick (family Ixodidae) and the principal vector of Lyme disease (Borrelia burgdorferi) in the western United States. This species has a four-stage life cycle (egg, larva, nymph, adult) that takes approximately three years to complete under natural conditions. Adults are sexually dimorphic: males have a complete scutum covering the dorsal surface and cannot engorge, while females have a partial scutum and can expand significantly when feeding. The species is a known vector for multiple human pathogens including Borrelia burgdorferi, Borrelia miyamotoi, Anaplasma phagocytophilum, and others.
Ixodes scapularis
deer tick, black-legged tick, bear tick, Eastern Black-legged Tick
Ixodes scapularis is a hard-bodied tick native to the eastern and upper midwestern United States, with expanding populations in Canada. It is the primary vector of Lyme disease (Borrelia burgdorferi) in North America and transmits multiple other pathogens including Babesia microti, Anaplasma phagocytophilum, and Powassan virus. The tick has a two-year life cycle with three blood-feeding stages (larva, nymph, adult), each requiring a different host individual. Climate change is driving northward range expansion and increased human encounters.
Ornithodoros turicata
relapsing fever tick
Ornithodoros turicata is a soft tick (family Argasidae) found in the midwestern and southwestern United States. It is the primary vector of Borrelia turicatae, the spirochete agent of tick-borne relapsing fever in humans. The tick has been documented feeding on at least 27 vertebrate host species across mammals, birds, reptiles, and amphibians. It exhibits autogenous reproduction (egg production without a bloodmeal) and transovarial transmission of spirochetes, enabling pathogen maintenance across generations.
Ornithonyssus
bird mites, fowl mites, rat mites
Ornithonyssus is a genus of hematophagous mites in the family Macronyssidae. The genus includes economically important poultry pests such as the northern fowl mite (O. sylviarum) and tropical fowl mite (O. bursa), as well as the tropical rat mite (O. bacoti) which affects rodents and can bite humans. Species in this genus are obligate blood-feeders that complete their entire life cycle on the host or in close association with host nesting material. Several species have significant veterinary and medical importance due to their impacts on poultry production and potential to cause human dermatitis.
Ornithonyssus bacoti
tropical rat mite
Ornithonyssus bacoti, commonly called the tropical rat mite, is a hematophagous mesostigmatid mite in the family Macronyssidae. It is an obligate blood-feeding ectoparasite primarily associated with rats and other rodents, but will opportunistically bite humans and domestic animals when primary hosts are unavailable. The mite is of significant medical and veterinary importance due to its role in causing rat mite dermatitis in humans and its potential to vector several pathogens. It exhibits remarkable survival capabilities, traveling hundreds of feet to locate hosts and surviving extended periods without feeding.
Paratriatoma
kissing bugs
Paratriatoma is a genus of kissing bugs (subfamily Triatominae) in the assassin bug family Reduviidae. The genus contains at least two species: Paratriatoma hirsuta, the type species, and Paratriatoma lecticularia. Members are blood-feeding insects that serve as vectors of Trypanosoma cruzi, the parasite that causes Chagas disease. Research on P. lecticularia has revealed notable parasite persistence in dead specimens and aggregation behavior mediated by fecal pheromones.
Phortica
Phortica is a genus of small flies in the family Drosophilidae, subfamily Steganinae. Several species are medically significant as biological vectors of the zoonotic eyeworm Thelazia callipaeda, which causes ocular infections in humans, domestic animals, and wildlife. The genus includes at least five species in Europe and the Middle East, with P. variegata and P. okadai being the best-documented vectors. These flies exhibit unusual zoophilic feeding behaviors, including lachryphagy (tear-feeding) in adult males of some species. The genus has gained increasing attention due to climate-driven range shifts and expanding transmission of thelaziosis.
Pulex irritans
Human Flea, House Flea
Pulex irritans is a cosmopolitan flea species commonly known as the human flea. Despite its name, it has a broad host range including humans, dogs, cats, livestock, and various wild mammals. The species is thought to have originated in South America, possibly associated with guinea pigs or peccaries as original hosts. It is one of only six species in the genus Pulex, with the other five restricted to Nearctic and Neotropical regions. P. irritans has been found in human archaeological sediments dating back thousands of years in Europe and Greenland, demonstrating its long association with human populations. The species is medically significant as a potential vector of plague (Yersinia pestis), murine typhus, trench fever (Bartonella quintana), flea-borne spotted fever (Rickettsia felis), and the tapeworm Dipylidium caninum.
Sarcoptes
itch mite, mange mite
Sarcoptes is a genus of parasitic mites in the family Sarcoptidae. The genus contains species that are permanent obligate ectoparasites of mammals, most notably *Sarcoptes scabiei*, which causes scabies in humans and sarcoptic mange in livestock, wildlife, and companion animals. These mites burrow into the epidermis of their hosts, where they feed, reproduce, and complete their entire life cycle. Infestations cause intense pruritus, skin lesions, and significant economic and health impacts globally. Taxonomic treatment varies: some authorities recognize multiple host-specific varieties of *S. scabiei*, while others treat these as distinct species.
Sarcoptes scabiei
Scabies Mite, Itch Mite
Sarcoptes scabiei is a parasitic mite that burrows into the epidermis of mammals, causing scabies in humans and sarcoptic mange in animals. The mite has a cosmopolitan distribution and infests numerous host species including humans, domestic animals, and wildlife. Adult females create characteristic S-shaped burrows in the stratum corneum where they deposit eggs. The disease produces intense pruritus through host immune responses to mites, eggs, and fecal pellets. Different host-adapted variants exist, though cross-infectivity between closely related hosts has been documented.
Sarcoptidae
Itch Mites
Sarcoptidae is a family of parasitic mites in the order Sarcoptiformes, commonly known as itch mites. The family includes the genus Sarcoptes, whose members cause sarcoptic mange in mammals. These mites are obligate parasites that burrow into host skin, causing intense pruritus, crusting lesions, and potentially fatal secondary infections. Sarcoptes scabiei, the most studied species, infests over 200 million humans worldwide and numerous domestic and wild mammal species.
parasitemitescabiesmangezoonosisveterinarywildlife-diseaseneglected-tropical-diseaseburrowingepidermal-parasitedirect-life-cyclehost-specific-strainsimmunologyemerging-infectious-diseasebiodiversity-threatcross-species-transmissionferal-dog-reservoirquantitative-surveillancetissue-digestion-protocolivermectin-treatmentcrusted-scabiesordinary-scabiespruritusalopeciahyperkeratosissecondary-bacterial-infectionWHO-neglected-tropical-diseaseover-200-million-human-casesmammalian-host-specificityAstigmataSarcoptiformesArachnidaAcariTortopus
Tortopus is a genus of burrowing mayflies in the family Polymitarcyidae, restricted to six species based on cladistic revision: T. igaranus, T. circumfluus, T. harrisi, T. zottai, T. bellus, and T. arenales. The genus is characterized by distinctive morphological synapomorphies including female parastyli receptors with long anterior furrows, entirely flattened penes, and nymphs bearing two subapical tubercles on mandibular tusks. Nymphs construct U-shaped tunnels in clay banks, a behavior that renders them difficult to sample with standard aquatic survey methods.
EphemeropteraPolymitarcyidaeburrowing-mayfliesNeotropicalclay-bank-habitatU-shaped-tunnelsmandibular-tusksTortopsisCampsurinaePanamerican-distributioncladistic-revisionsynapomorphyparastyli-receptorsflattened-penesfurcasternal-protuberancessubapical-tubercleslimnological-sampling-biasnymph-morphologyadult-morphologytype-species-T.-igaranusnew-species-T.-arenalesEcuadorColombiaArgentinaMolineri-2008Needham-&-Murphy-1924ZootaxaArthropod-Systematics-&-PhylogenyFlorida-EntomologistGBIFCatalogue-of-LifeiNaturalistNCBI-Taxonomyembryonic-developmentearly-instar-behaviorT.-harrisiT.-bellusT.-circumfluusT.-zottaiT.-igaranusT.-incertusT.-coreguajeTortopsis-toroTortopsis-andakiTortopsis-limoncochaTortopsis-spatulaaquatic-insectsfreshwaterriverineloticephemeropteran-systematicstaxonomic-revisionphylogenetic-analysismorphological-charactersegg-morphologymale-imago-descriptionfemale-adult-descriptionkeys-to-speciesSEM-photographyline-drawingstype-material-examinationredescriptioncomparative-diagnosisburrowing-behaviorclay-substratetunnel-constructionsampling-methodologysurber-sampler-limitationsdrift-net-avoidancePanamaSouth-AmericaCentral-Americamayfly-diversityhighest-diversity-NeotropicsAsthenopodinaeEphemeroideaHexapodaMetazoaEukaryotaaccepted-genushigher-rank-matchobservation-count-2no-Wikipedia-summaryDOI-10.11646/zootaxa.2481.1.1DOI-10.11646/zootaxa.2436.1.4DOI-10.3897/asp.79.e62735DOI-10.2307/3493493Scott-et-al.-1959NavásUlmerTraverLugo-Ortiz-&-McCaffertyDomínguezBanksMcDunnoughPictetNeedham-&-Murphyfreshwater-ecologyaquatic-entomologyinsect-developmentnymphal-stagesimago-descriptionalate-adultswing-venationR-sectorgonopore-structureparastyli-lengthpedestal-morphologylateral-view-curvaturemandibular-morphologytusk-tuberclesmesosternal-structureabdominal-sternum-notchfurcasternumprotuberance-configurationreceptor-socket-orientationIR-veinR2-veinclaw-like-structuregonopore-associationpenis-base-separationfemale-fore-wingadditional-veinscomparative-morphologytype-specimenholotypeallotypeparatypeneotropical-speciesnew-species-descriptionspecies-keyidentification-keymale-adult-keyfemale-adult-keynymph-keygeneric-keyPolymitarcyidae-generasystematicsphylogenycladisticsmonophylysister-groupcharacter-statetransformation-seriesparsimony-analysismorphological-data-setexternal-morphologyegg-chorionmicropyleegg-bursterhatchingemergencebehavioral-studyearly-instarembryologyovipositionsubstrate-preferencehabitat-specificityendemicregional-diversityconservationbiomonitoringwater-quality-indicatormacroinvertebratebenthicinfaunalinterstitialhyporheicriver-bankstream-bankerosionsedimentparticle-sizeclay-contentbank-stabilityroot-matvegetation-associationflow-regimecurrent-velocitydepthwidthstream-ordercatchmentbasinecoregionbiogeographydispersalcolonizationvicariancespeciationadaptive-radiationmorphological-divergenceconvergent-evolutionhomoplasycharacter-conflictbootstrap-supportBremer-supportconsensus-treestrict-consensusmajority-ruletaxonomic-stabilitynomenclatural-actoriginal-descriptionsubsequent-designationtype-localitytype-depositorymuseum-collectionspecimen-preservationalcohol-preservationslide-mountingSEM-preparationimaging-techniquesscientific-illustrationphotographymeasurementmorphometricsratiosproportionsallometrysexual-dimorphismgeographic-variationintraspecific-variationinterspecific-variationdiagnostic-charactersidentification-confidencetaxonomic-expertiseliterature-reviewbibliographic-searchdatabase-queryonline-repositoryopen-accesspaywallabstract-onlyfull-text-unavailablecitation-analysisreference-listsource-qualityevidence-strengthknowledge-gapresearch-needfuture-studycollaborationfield-workcollection-tripsampling-effortspecimen-availabilitytype-examinationrevision-scopetaxonomic-conceptcircumscriptioninclusionexclusionspecies-groupspecies-complexcryptic-speciesmorphospeciesphylogenetic-speciesevolutionary-significant-unitoperational-taxonomic-unitDNA-barcodingmolecular-systematicsintegrative-taxonomytraditional-taxonomyalpha-taxonomybeta-taxonomygamma-taxonomyclassification-hierarchyLinnaean-systemrank-based-nomenclaturephylogenetic-nomenclatureclade-namecrown-groupstem-grouptotal-evidencecongruenceincongruencedata-partitioncharacter-weightingimplied-weightingequal-weightingordered-charactersunordered-charactersmultistate-charactersbinary-characterscontinuous-charactersmeristic-charactersqualitative-charactersquantitative-charactersmorphological-matrixdata-matrixcharacter-matrixtaxon-samplingcharacter-samplingmissing-datainapplicable-datapolymorphismintraspecific-polymorphismfixed-differencediagnostic-differenceunique-derived-characterautapomorphyshared-derived-charactersymplesiomorphyconvergent-characterparallel-evolutionreversalcharacter-optimizationACCTRANDELTRANunambiguous-optimizationambiguous-optimizationmost-parsimonious-treetree-lengthconsistency-indexretention-indexrescaled-consistency-indexhomoplasy-indexcharacter-fitcharacter-congruencecharacter-supportbranch-supportnode-supportclade-stabilitytaxonomic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protracta
western bloodsucking conenose
Triatoma protracta is a blood-feeding assassin bug in the subfamily Triatominae, commonly known as the western bloodsucking conenose. Native to western North America, it serves as a vector of Trypanosoma cruzi, the protozoan causing Chagas disease, though its vector efficiency is considered secondary to some congeners due to its relatively long development time and defecation behavior. The species is primarily associated with woodrat (Neotoma) nests and occasionally invades human dwellings, where it may bite and cause allergic reactions. Laboratory studies indicate egg-to-adult development averages 6.7 months with 72.5% egg eclosion rates.
Triatoma sanguisuga
Eastern Bloodsucking Conenose, Mexican Bed Bug, Kissing Bug
Triatoma sanguisuga is a blood-feeding assassin bug in the subfamily Triatominae, commonly known as the eastern bloodsucking conenose or kissing bug. It is the most widespread triatomine species in the United States and serves as a vector for Trypanosoma cruzi, the parasite that causes Chagas disease. Unlike highly efficient South American vectors such as Triatoma infestans, T. sanguisuga typically defecates after feeding rather than during, reducing but not eliminating transmission risk to humans. The species has been implicated in documented autochthonous human Chagas disease cases in the United States.