Decomposer
Guides
Acaricoris
flat bugs
Acaricoris is a genus of flat bugs (family Aradidae) established by Harris & Drake in 1944. The genus contains approximately eight described species distributed primarily in North America and the Caribbean. Members of this genus are associated with decaying wood habitats. As with other aradids, they are flattened dorsoventrally and are typically found in concealed microhabitats such as under bark.
Acaricoris ignotus
flat bug
Acaricoris ignotus is a species of flat bug in the family Aradidae, described by Harris and Drake in 1944. It inhabits forest floor environments in the eastern United States, where it occupies decaying wood and leaf litter. As a member of the Aradidae, it exhibits the family's characteristic flattened body form and cryptic lifestyle in decomposing organic substrates.
Acritus exiguus
clown beetle
Acritus exiguus is a small clown beetle (family Histeridae) described by Erichson in 1834. It occurs across much of eastern North America from southern Canada to Mexico, with records from the northeastern United States through the Gulf Coast states and west to Colorado and Texas. Like other members of the genus Acritus, it is minute in size and associated with decaying organic matter. The species is documented from museum collections and limited iNaturalist observations, though detailed ecological studies remain sparse.
Acrotrichini
Acrotrichini is a tribe of minute featherwing beetles (family Ptiliidae) characterized by their extremely small body size—among the smallest of all beetles. Members possess distinctive wing morphology with reduced venation and fringed margins that enable flight despite their diminutive size. The tribe was established by Reitter in 1909 and is classified within the subfamily Ptiliinae. Acrotrichini includes the genus Acrotrichis, which contains numerous species distributed across multiple continents.
Adoristes
Adoristes is a genus of oribatid mites in the family Liacaridae, established by Hull in 1916. The genus contains species associated with decomposing coniferous litter in northern temperate forests. The best-studied species, Adoristes ovatus, exhibits pronounced sexual size dimorphism and develops through a characteristic morphological ontogeny with distinct juvenile stages adapted for xylophagy.
Adoxomyia
soldier flies
Adoxomyia is a genus of soldier flies (Stratiomyidae) comprising at least 30 described species. The genus has a broad geographic distribution, with species documented across the Palaearctic, Nearctic, Oriental, and Neotropical regions. Larvae develop in decaying vegetable substrates, particularly rotting roots and stems of plants in desert and arid environments. Adults are often associated with flowers.
Agathidiini
round fungus beetles
Agathidiini is a tribe of small beetles within the family Leiodidae, commonly known as round fungus beetles. Members are characterized by their association with slime moulds, which serve as their primary food source. The tribe encompasses 11 genera distributed across multiple continents.
Agoliinus canadensis
Canadian dung beetle
Agoliinus canadensis is a species of dung beetle in the family Scarabaeidae, subfamily Aphodiinae. It occurs in western North America, with records from the Canadian provinces of Alberta, British Columbia, and Saskatchewan, and from the western United States including California, Colorado, Idaho, Montana, Oregon, Washington, and Wyoming. As a member of the Aphodiinae, it is associated with dung decomposition. The species was described by Garnett in 1920.
Akamptogonus
A genus of flat-backed millipedes in the family Paradoxosomatidae, containing approximately 11 described species. The genus was established by Attems in 1914. Species occur across parts of Australia, New Guinea, and surrounding regions. As members of the Polydesmida, they possess a flattened body form with lateral extensions (paranota) on each body segment.
Alaus myops
Small-eyed Click Beetle, Blind Click Beetle
Alaus myops, commonly known as the Small-eyed Click Beetle or Blind Click Beetle, is a large elaterid beetle distinguished by its reduced eyespots compared to its congener A. oculatus. Adults are primarily slate gray in coloration and active in southern pine forests. The species exhibits the characteristic clicking mechanism of the family Elateridae, using a prosternal spine and mesosternal notch to launch itself when disturbed. Both adults and larvae are predatory, inhabiting loose bark on pine trees, logs, and stumps.
Allacrotelsa spinulata
silverfish
Allacrotelsa spinulata is a North American silverfish species in the family Lepismatidae. It belongs to the order Zygentoma, an ancient lineage of wingless insects. The species is relatively well-documented with over 800 iNaturalist observations. It is distinguished from other silverfish by specific morphological features including prominent spines on the caudal filaments.
Alloblackburneus
Alloblackburneus is a genus of scarab beetles (family Scarabaeidae, subfamily Aphodiinae) described by Bordat in 2009. It belongs to the tribe Aphodiini, a group commonly known as small dung beetles. The genus is endemic to the Afrotropical region. Species in this genus are part of the diverse Aphodiinae fauna associated with decomposition and nutrient cycling in African ecosystems.
Allonychiurus flavescens
Allonychiurus flavescens is a species of springtail in the family Onychiuridae. It is a small, soil-dwelling hexapod found in Pacific North American and Sino-Japanese regions. As an euedaphic collembolan, it lives deep within soil profiles and lacks a furcula (springing organ) typical of surface-dwelling springtails. The species was described by Kinoshita in 1916.
Allopauropus carolinensis
Allopauropus carolinensis is a species of pauropod, a group of small, soil-dwelling myriapods in the class Pauropoda. Pauropods are among the least studied myriapod classes, characterized by their diminutive size and cryptic lifestyle in soil and leaf litter. The species was described by Starling in 1943 and is known from North America, with records from Ontario.
Allopiophila testacea
Allopiophila testacea is a species of cheese skipper fly in the family Piophilidae, described by Melander in 1924. The genus Allopiophila is small and contains few described species. Members of Piophilidae are known for their association with protein-rich decomposing organic matter, particularly animal remains and cheese. The specific epithet 'testacea' refers to the shell-like or testaceous coloration typical of the species.
Amblyderus adventive-sp
A small histerid beetle of the genus Amblyderus, recognized as an adventive species in certain regions. Members of this genus are generally associated with decaying organic matter and are often found in dung, carrion, or compost habitats. The specific epithet 'adventive-sp' suggests this represents a non-native or recently introduced population. As with many histerids, it likely serves as a predator or scavenger in decomposing substrates.
Americanura bara
Americanura bara is a species of springtail in the family Neanuridae, described by K. Christiansen and P. Bellinger in 1980. It belongs to the order Poduromorpha, a group of springtails characterized by their relatively short bodies and reduced furcula. The species is part of the genus Americanura, which contains several North American species. Distribution records indicate presence in northern and southern North America.
Ametor scabrosus
Ametor scabrosus is a water scavenger beetle (family Hydrophilidae) found across northern and western North America, with additional records from East Asia including China, Korea, and the Russian Far East. The species was described by Horn in 1873. Like other members of the genus Ametor, it inhabits aquatic environments where it contributes to decomposition processes.
Amoebaleria infuscata
Amoebaleria infuscata is a species of true fly in the family Heleomyzidae, described by Gill in 1962. The genus Amoebaleria is a small group within this family of saprophagous flies. Very little specific information is documented about this species beyond its taxonomic description. It belongs to a family whose larvae generally develop in decaying organic matter.
Amphicrossus
Amphicrossus is a genus of sap-feeding beetles in the family Nitidulidae. The genus was established by Erichson in 1843 and contains approximately nine described species distributed across North America, Europe, and Asia. Members are associated with decaying plant matter and fermenting sap flows.
Anatrachyntis badia
Florida Pink Scavenger
A small scavenger moth with a 9–10 mm wingspan, native to the southern United States and introduced to Europe and Hawaii. Larvae feed on decaying plant material, dried fruit, and sooty mold, occasionally causing superficial damage to citrus rinds. First described by Ronald W. Hodges in 1962.
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.
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Anurophorinae is a subfamily of springtails (Collembola) within the family Isotomidae, established by Börner in 1901. Members of this subfamily are characterized by the absence of a furcula (springing organ), a trait reflected in the name 'Anurophorinae' (meaning 'tailless'). These small hexapods are part of the diverse soil and leaf litter fauna, contributing to decomposition processes. The subfamily is moderately well-represented in global collections with over 1,100 iNaturalist observations recorded.
Anurophorus near-septentrionalis
Anurophorus near-septentrionalis is a species of springtail in the family Isotomidae. It belongs to a genus of small, elongate collembolans found primarily in soil and leaf litter habitats. The specific epithet 'near-septentrionalis' suggests morphological similarity to A. septentrionalis, a northern-distributed species, though its precise taxonomic status may require verification.
Apheloria
cherry millipedes, flat-backed millipedes
Apheloria is a genus of large, chemically defended millipedes in the family Xystodesmidae, distributed across eastern North America. These millipedes are notable for producing hydrogen cyanide and benzaldehyde as defensive secretions, which imparts a characteristic cherry or almond odor. The genus participates in Müllerian mimicry rings in the Appalachian Mountains, with species displaying highly variable aposematic coloration involving black backgrounds with contrasting yellow, orange, red, or white markings. Species-level identification requires examination of male gonopod morphology due to extensive color polymorphism and convergent color patterns among co-occurring species.
Apheloriini
cherry millipedes
Apheloriini is a tribe of large, colorful flat-backed millipedes endemic to the temperate forests of eastern North America. All species produce hydrogen cyanide as a chemical defense, which generates a characteristic cherry or almond odor from benzaldehyde byproducts. Members display bright aposematic coloration warning predators of their toxicity. The tribe includes seven genera, with greatest diversity concentrated in the southern Appalachian Mountains. Species in this tribe participate in Müllerian mimicry rings, resulting in extreme intraspecific variation in color patterns.
Apterocyclus honoluluensis
Kauai Flightless Stag Beetle
Apterocyclus honoluluensis, the Kauai flightless stag beetle, is a flightless stag beetle endemic to the Hawaiian island of Kauai. It is the smallest and most commonly encountered species in its genus, with adults measuring 14–17 mm, rarely reaching 21 mm. The species has declined due to predation by introduced mice and habitat loss, and was considered for protection under the U.S. Endangered Species Act in 1994 but was declined due to insufficient data.
Araecerini
Araecerini is a tribe of fungus weevils within the family Anthribidae. Members are characterized by their association with fungal resources and distinctive morphological features. The tribe contains multiple genera distributed across tropical and subtropical regions. These beetles are primarily mycophagous, feeding on fungi at various life stages.
Arcitalitrus
Lawn Shrimps, Beach Hoppers
Arcitalitrus is a genus of fully terrestrial amphipods commonly known as lawn shrimps or beach hoppers. The genus contains nine described species native to Australasia, with Arcitalitrus dorrieni and A. sylvaticus introduced to Europe and elsewhere through human activity. These crustaceans have adapted to life away from aquatic environments, inhabiting forest leaf litter and soil. Some species have become invasive outside their native range, spreading via the international plant trade.
Arcitalitrus sylvaticus
lawn shrimp, lawn prawn, landhopper
Arcitalitrus sylvaticus is a terrestrial amphipod native to Australia and nearby Pacific regions. It has been introduced to California, New Zealand, North Carolina, and Florida, with the first California record in 1967. The species is highly sensitive to moisture conditions, perishing in dry environments and drowning in saturated soils. It serves as a significant primary decomposer of leaf litter in its habitat.
Arenivaga gaiophanes
desert cockroach, sand cockroach
Arenivaga gaiophanes is a species of desert cockroach in the family Corydiidae, described by Heidi Hopkins in 2014 as part of a major revision of the genus Arenivaga. The genus Arenivaga, previously containing only nine species, was expanded to include 39 new species in this revision. Members of this genus inhabit harsh, arid environments and exhibit dramatic sexual dimorphism, with females appearing entirely different from males. The species epithet 'gaiophanes' derives from Greek roots meaning 'earth-revealing,' alluding to their subterranean habits.
Arenivaga hopkinsorum
desert cockroach, sand cockroach
Arenivaga hopkinsorum is a species of desert cockroach in the family Corydiidae, described by Heidi Hopkins in 2014 as part of a major revision of the genus Arenivaga. Like other Arenivaga species, it exhibits dramatic sexual dimorphism, with females appearing wingless and males possessing fully developed wings. The species inhabits arid environments in the southwestern United States and Mexico, where it contributes to decomposition despite limited plant matter. The specific epithet honors the Hopkins family, particularly referencing the author's father and brother.
Arenivaga tenax
desert cockroach, sand cockroach
Arenivaga tenax is a species of desert cockroach in the family Corydiidae, described by Heidi Hopkins in 2014 as part of a comprehensive revision of the genus Arenivaga. The genus was dramatically expanded from 9 to 48 species through this work, revealing extensive undiscovered diversity in arid-adapted cockroaches. Like other Arenivaga species, A. tenax exhibits extreme sexual dimorphism, with males and females appearing so different that associating specimens of the same species presents significant taxonomic challenges. The species is known from male specimens only, with species-level identification relying on complex genital characters.
Arhopalus
burnt pine longhorn beetle (A. ferus), black pine sawyer (A. rusticus)
Arhopalus is a genus of longhorn beetles (Cerambycidae: Spondylidinae: Asemini) distributed across the Northern Hemisphere, with several species introduced to the Southern Hemisphere as invasive pests of conifers. The genus comprises approximately 20 described species, with A. rusticus and A. ferus being the most extensively studied due to their economic importance. Species develop in dead or fire-damaged conifer wood, with some exhibiting strong attraction to burnt pine volatiles. Several species produce male-emitted aggregation-sex pheromones containing fuscumol and geranylacetone. Invasive populations in New Zealand, Australia, South America, and South Africa require monitoring at ports and sawmills for timber export compliance.
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te-statemethodological-state-stateepistemological-state-stateontological-state-stateaxiological-state-statepraxeological-state-statelogical-state-staterational-state-statereasonable-state-statesensible-state-statepragmatic-state-statepractical-state-statetheoretical-state-stateconceptual-state-stateempirical-state-stateexperimental-state-stateobservational-state-stateexperiential-state-statephenomenological-state-statehermeneutical-state-statecritical-state-statereflexive-state-statereflective-state-staterepresentative-state-stateArhopalus rusticus obsoletus
Arhopalus rusticus obsoletus is a subspecies of longhorned beetle in the family Cerambycidae. It belongs to a species complex with Holarctic distribution, occurring in both North America and Eurasia. The subspecies is associated with coniferous wood, where larvae develop under bark. Adults are active during warmer months and can be found on or near dead conifers.
Ataenius alternatus
Ataenius alternatus is a small aphodiine dung beetle in the family Scarabaeidae, first described by Melsheimer in 1845. The species occurs across the southeastern United States and into Mexico. Like other members of the genus Ataenius, it is associated with decomposing organic matter and soil habitats. It is one of numerous Ataenius species found in North American turfgrass and agricultural systems.
Ataenius imbricatus
Ataenius imbricatus is a small aphodiine dung beetle in the family Scarabaeidae. First described by Melsheimer in 1845 (originally as Aphodius imbricatus), this species exhibits a broad geographic distribution spanning the Nearctic and Neotropical regions. It is one of numerous species in the diverse genus Ataenius, which comprises small scarab beetles often associated with decomposing organic matter.
Ataenius strigatus
Ataenius strigatus is a small aphodiine dung beetle in the family Scarabaeidae. The species was originally described by Thomas Say in 1823 as Aphodius strigatus. It occurs across much of North America and extends into Central America. Like other members of the genus, it is associated with decomposing organic matter.
Atarba picticornis
Atarba picticornis is a limoniid crane fly whose larvae develop in decaying hardwood logs and stumps, where they feed on decomposing wood and associated fungi. The life cycle spans approximately one year, with adults emerging in spring to mate in swarms near larval habitat sites. This species functions as a decomposer in forest ecosystems and has been documented across eastern North America from Canada to the southern United States.
Atheta longicornis
Atheta longicornis is a rove beetle species in the family Staphylinidae, first described by Gravenhorst in 1802. The species has a broad native distribution across Europe, North Africa, and parts of Asia, and has been introduced to North America (Canada and the United States), Australia, and other regions. As a member of the hyperdiverse genus Atheta, it inhabits various terrestrial habitats where it contributes to decomposition processes. The species is characterized by its relatively long antennae, which inspired its specific epithet.
Atholus bimaculatus
Spotted Clown Beetle
Atholus bimaculatus, commonly known as the spotted clown beetle, is a species of histerid beetle with a remarkably broad geographic distribution spanning multiple continents. The species is native to the Palearctic region (Europe, Northern Asia, North Africa) and has been introduced to North America, South America, and parts of Asia. It belongs to the family Histeridae, a group commonly called clown beetles or hister beetles, which are typically associated with decomposing organic matter. The specific epithet 'bimaculatus' refers to two spots, likely describing a characteristic marking pattern on the elytra.
Atholus relictus
clown beetle
Atholus relictus is a species of clown beetle in the family Histeridae. It is found in North America, with records from Canada and the United States. The species was described by Marseul in 1870. As a member of Histeridae, it belongs to a group of beetles commonly associated with decomposing organic matter.
Bdellozonium cerviculatum
Bdellozonium cerviculatum is a small millipede species in the family Polyzoniidae, one of two recognized species in its genus. It is native to the forests of California, where it inhabits crevices in decaying wood. The species reaches up to 16 mm in length and displays distinctive salmon pink coloration in living specimens. It was described by Cook & Loomis in 1928.
Berosus miles
Berosus miles is a species of water scavenger beetle in the family Hydrophilidae, first described by John Lawrence LeConte in 1855. The species is distributed across North America (including the southwestern United States) and Central America, with records from Arizona, Texas, and Mexico. As a member of the genus Berosus, it inhabits aquatic environments and contributes to decomposition processes in freshwater ecosystems.
Berosus peregrinus
Berosus peregrinus is a water scavenger beetle (Hydrophilidae) native to North America and the Caribbean. It inhabits freshwater environments including marshes, ponds, and sluggish streams. Like other members of its genus, it is adapted to aquatic life and contributes to decomposition of organic material in aquatic ecosystems.
Bibio abbreviatus
Bibio abbreviatus is a species of march fly in the family Bibionidae, first described by Loew in 1864. Adults emerge in spring and are known for forming large swarming aggregations. Males possess holoptic eyes that meet at the top of the head, while females have relatively small heads. The species belongs to a genus of decomposer flies whose larvae develop in soil.
Bibio articulatus
red-legged march fly
Bibio articulatus is a species of march fly in the family Bibionidae, commonly known as the red-legged march fly. It is distinguished by its dark exoskeleton ranging from black to deep red and its conspicuous red or orange legs. The species exhibits pronounced sexual dimorphism, particularly in eye size and body proportions. It is most active during spring months and is found primarily in the eastern United States.
Bibio brunnipes
Bibio brunnipes is a march fly in the family Bibionidae with a Holarctic distribution, occurring across northern regions of both the Old and New Worlds. The species has been subject to taxonomic revision, with several previously described species now synonymized under B. brunnipes. Like other members of the genus, adults are typically active in spring and may occur in large aggregations. Larval stages develop in soil and contribute to decomposition processes.
Bibio femoratus
March fly, Lovebug
Bibio femoratus is a medium-sized fly in the family Bibionidae, commonly known as the March fly or lovebug in the southeastern United States. Adults are recognized by their black bodies with orange or red thorax and legs, and a diagnostic dark spot on the leading edge of the wing. The species forms conspicuous mating swarms in early spring, with pairs remaining coupled for extended periods. Larvae develop in soil and feed on decaying organic matter.
Bibio longipes
Bibio longipes is a species of march fly in the family Bibionidae. It is found in both the Palearctic and Nearctic regions. Like other members of the genus Bibio, adults are typically active in spring and are known for forming large mating swarms. The species was described by Loew in 1864.