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Eudioctria brevis
Eudioctria brevis is a small species of robber fly in the family Asilidae, subfamily Stenopogoninae. It is one of four Eudioctria species occurring in eastern North America, with the genus primarily distributed in western United States. The species is among the smallest North American robber flies, measuring 6–8 mm in length. It was described by Banks in 1917.
Eudioctria disjuncta
A small robber fly in the subfamily Stenopogoninae, measuring 6–8 mm in length. One of the tiniest North American robber flies, superficially resembling Cerotainia species but distinguished by shorter antennae and behavioral perching preferences. The genus Eudioctria is primarily western in distribution, with E. disjuncta being one of four eastern species.
Eudioctria dissimilis
Eudioctria dissimilis is a species of robber fly in the subfamily Stenopogoninae, described by Adisoemarto and Wood in 1975. The genus Eudioctria comprises some of the smallest North American robber flies, with body lengths of 6–8 mm. Species in this genus are primarily western in distribution, though E. dissimilis is one of four eastern species.
Eudioctria doanei
Eudioctria doanei is a small robber fly (family Asilidae) in the subfamily Stenopogoninae. It belongs to a genus of diminutive predatory flies measuring only 6–8 mm in length, making them among the smallest North American robber flies. The species was described by Melander in 1924. While specific details about this particular species are sparse, the genus Eudioctria is primarily western in distribution, with four of its fourteen species extending into eastern North America. Members of this genus are known to perch on flat leaves at the tops of small shrubs, distinguishing them behaviorally from similar-looking Cerotainia species that prefer twig-ends.
Eudioctria media
Eudioctria media is a species of robber fly in the family Asilidae, subfamily Stenopogoninae. It is one of approximately 14 species in the genus Eudioctria, a group of small predatory flies found primarily in western North America with a few species extending into eastern states. The genus is characterized by extremely small body size among robber flies, measuring only 6–8 mm in length.
Eudioctria nitida
Eudioctria nitida is a species of robber fly in the family Asilidae, subfamily Stenopogoninae. It is one of the smallest North American robber flies, measuring approximately 6–8 mm in length. The genus Eudioctria contains 14 species, with most distributed in the western United States; four species (including E. nitida) extend into eastern North America. Species identification within the genus requires examination of facial gibbosities and pollinosity patterns.
Eudioctria propinqua
Eudioctria propinqua is a species of robber fly in the family Asilidae, subfamily Stenopogoninae. It is among the smallest North American robber flies, measuring approximately 6–8 mm in length. The species occurs in eastern North America and is one of four Eudioctria species found in the eastern United States.
Eudioctria sackeni
Eudioctria sackeni is a species of robber fly in the family Asilidae, subfamily Stenopogoninae. The genus Eudioctria comprises among the smallest North American robber flies, measuring only 6–8 mm in length. Species in this genus superficially resemble Cerotainia (subfamily Laphriinae) but lack the extra-long antennae. Eudioctria is primarily a western U.S. genus, though four of its 14 species occur in eastern states.
Eudioctria unica
Eudioctria unica is a species of robber fly in the family Asilidae, described by Adisoemarto and Wood in 1975. It belongs to the subfamily Stenopogoninae and is among the smallest North American robber flies, measuring only 6–8 mm in length. The genus Eudioctria is primarily western in distribution, with only four species extending into eastern North America.
Euryopis californica
Euryopis californica is a small cobweb spider in the family Theridiidae, notable for its highly specialized ant-hunting behavior. Unlike most theridiids that construct tangled webs to capture prey, this species is an active predator that specifically targets harvester ants. It has been documented as a predator of Veromessor pergandei, employing unique hunting tactics to overcome the formidable defenses of these aggressive ants. The species occurs in the United States and Mexico.
Euryopis mulaiki
Euryopis mulaiki is a minute cobweb spider (Theridiidae) in the subfamily Hadrotarsinae, distinguished by its unusual hunting behavior. Unlike web-building relatives, this species is an active ant predator that immobilizes prey by flinging silk rather than constructing capture webs. Adults are exceptionally small, with body lengths of 1.3–4.7 mm, and exhibit a characteristic sub-triangular abdominal shape with bold color patterns. The species was described by Levi in 1954 and occurs in the southwestern United States and Mexico.
Euryopis quinquemaculata
Five-spotted ant-hunting spider
Euryopis quinquemaculata is a small cobweb spider in the family Theridiidae, placed in the subfamily Hadrotarsinae. Unlike typical theridiids that construct tangled webs to catch prey, this species is an active ant specialist that hunts without building prey-capturing webs. The species name refers to the five-spotted abdominal pattern characteristic of this and related Euryopis species. It occurs in the United States, where it inhabits areas with high ant activity.
Eutricopis nexilis
White-spotted Midget
Eutricopis nexilis, commonly known as the White-spotted Midget, is a small noctuid moth with a wingspan of 18–20 mm. Adults are active from May to July across a broad North American range spanning from the Atlantic coast to the Pacific. The species was first described by Herbert Knowles Morrison in 1875. Larvae have been documented feeding on Antennaria species.
Exelastis dowi
Dow's Plume Moth
Exelastis dowi is a small plume moth in the family Pterophoridae, recognized by its narrow, divided wings characteristic of the family. The species has been documented from Florida, The Bahamas, and Belize, with adult activity recorded in early spring. Its small size and limited geographic range distinguish it from related Exelastis species.
Givira minuta
Givira minuta is a small moth in the family Cossidae, first described from southern Arizona in 1910. The species is characterized by its diminutive size, with a wingspan of approximately 17 mm, and distinctive wing coloration featuring light ocherous brown forewings with a creamy costal margin and dark smoky brown hindwings. Adults are active during spring months, with flight records from April through June. The species belongs to a genus of carpenter moths, though specific biological details beyond basic morphology and phenology remain poorly documented.
Gomphaeschna
Pygmy Darners
Gomphaeschna is a genus of small dragonflies commonly called pygmy darners, currently comprising two extant species native to eastern North America. It represents one of the most ancient surviving dragonfly genera known, with fossil records extending to the earliest Cretaceous (Berriasian) of Russia. The genus formerly had a much broader distribution across Eurasia and western North America, with multiple fossil species documented from the Paleocene through Miocene. Some taxonomic authorities recognize it as the sole genus of the distinct family Gomphaeschnidae due to its deep evolutionary origins.
Hahnia cinerea
Ash Hahniid Spider
Hahnia cinerea is a small true spider in the family Hahniidae, commonly known as the Ash Hahniid Spider. It belongs to the subfamily Hahniinae, whose members are characterized by having all six spinnerets arranged in a single transverse row across the back of the abdomen, resembling the teeth of a comb—hence the common name 'comb-tailed spiders.' The species was described by Emerton in 1890 and occurs in North America.
Haimbachia diminutalis
Haimbachia diminutalis is a small crambid moth described from North America in 1965. It is known from limited records in Oklahoma and Texas. The species has a wingspan of approximately 16 mm and shows adult activity during spring, summer, and autumn months.
Helesius nubilans
Helesius nubilans is a small lady beetle in the family Coccinellidae. Adults measure approximately 2.8–3 mm in length. The species is known from a limited number of records in North America, specifically Texas. Its small size and distinctive coloration distinguish it from larger, more commonly encountered lady beetles.
Hippodamia arctica
Arctic lady beetle
Hippodamia arctica is a small lady beetle species in the family Coccinellidae with a Holarctic distribution spanning Europe, Northern Asia (excluding China), and North America. Adults measure approximately 4–4.5 mm and display a distinctive black body with yellowish-red markings. The species inhabits northern boreal and arctic-alpine regions, with records from British Columbia, Labrador, Yukon, Alaska, and across northern Eurasia.
Hippodamia caseyi
Casey's lady beetle, Casey's ladybird
Hippodamia caseyi, commonly known as Casey's lady beetle, is a small lady beetle species in the family Coccinellidae. Adults measure 4.80–6.70 mm in length. The species is native to western North America, with confirmed records from British Columbia, California, Colorado, Idaho, Montana, Oregon, Utah, Washington, and Alberta. The pronotum sometimes displays pale spots. Like other members of the genus Hippodamia, it is likely a predator of small insects such as aphids, though specific ecological studies for this species are limited.
Hoplistoscelis heidemanni
damsel bug
Hoplistoscelis heidemanni is a small predatory true bug in the damsel bug family Nabidae. As with other nabids, it is a nocturnal predator that subdues other insects, including prey larger than itself. The species is recorded from North America. Damsel bugs in this genus are among the smaller members of the family, with adults typically under 12 millimeters in length.
Hydroptilidae
Microcaddisflies, Purse-case Caddisflies
Hydroptilidae is the largest family of caddisflies (Trichoptera), comprising over 2,600 species in 76 genera and six subfamilies. Adults are minute, rarely exceeding 5 mm in length, making them the smallest caddisflies. They are characterized by simple hypermetamorphosis in larvae: early instars (I–IV) are caseless and free-living, while the final instar (V) constructs a distinctive purse-shaped portable case and develops a greatly enlarged (physogastric) abdomen as the primary feeding and growing stage. The family has a worldwide distribution, with subfamilies showing distinct regional patterns. Adults are strongly attracted to ultraviolet lights and may congregate in large numbers.
Hyperaspidius hercules
Hyperaspidius hercules is a small lady beetle (Coccinellidae) found in western North America. Adults measure 2.10–4.00 mm in length. The species exhibits sexual dimorphism in pronotal coloration: males have yellow pronota with black basal spots, while females have black pronota with faint yellow lateral margins. The elytra are black with yellow markings on the anterior, lateral, and discal areas. It has been recorded from Alberta, Colorado, Idaho, Montana, Nevada, Utah, and Wyoming.
Hyperaspidius marginatus
Hyperaspidius marginatus is a small lady beetle in the family Coccinellidae, first described by Gaines in 1933. Adults measure 1.75-2.40 mm in length. The species exhibits sexual dimorphism in pronotal coloration. It is known from Texas and potentially broader North American distribution, though records remain sparse.
Hyperaspis oculifera
Hyperaspis oculifera is a small lady beetle species in the family Coccinellidae, recorded from Arizona. Adults measure 2.0–2.6 mm in length. The species exhibits sexual dimorphism in pronotal coloration: males have yellow anterior margins and lateral areas of the pronotum, while females have a black anterior margin with yellow lateral areas. Each elytron bears a yellow spot. As a member of the genus Hyperaspis, it is likely a predator of scale insects, though specific prey records for this species are not documented.
Iridopsis sanctissima
Iridopsis sanctissima is a species of geometrid moth described by Barnes and McDunnough in 1917. It is a member of the subfamily Ennominae, a diverse group of inchworm moths whose larvae are characterized by their distinctive looping locomotion. The species has been recorded from arid and semi-arid regions of the southwestern United States and northern Mexico. Its small size and limited distribution suggest it may be associated with specific host plants in desert scrub or chaparral habitats, though these relationships remain poorly documented.
Koebelia
mottled pine leafhoppers
Koebelia is a genus of leafhoppers endemic to western North America, commonly known as mottled pine leafhoppers. Members of this genus are small insects, measuring 3–5 mm in length, with distinctive brown or gray coloration marked by darker spots. The genus is distinguished morphologically by a head that is wider than the prothorax. All known species are associated with pine trees as their host plants.
Lampronia aenescens
Lampronia aenescens is a small moth in the family Prodoxidae, first described by Walsingham in 1888. It is known from western North America, where adults are active in June. The species has a wingspan of 10.5–13.5 mm. Larvae feed on Rosa woodsii.
Lampronia russatella
Lampronia russatella is a small moth in the family Prodoxidae, first described by Clemens in 1860. It inhabits mesic forests in eastern North America. The species is known from limited observations, with adults active during late spring and early summer.
Lechriops oculatus
Lechriops oculatus is a small true weevil (family Curculionidae) native to North America. The species is documented in Canada from Manitoba eastward through Ontario to the Maritime provinces. Observations suggest it inhabits residential and semi-natural environments, including fence lines and areas with herbaceous vegetation. The specific epithet 'oculatus' likely refers to eye-like markings, though detailed morphological descriptions are limited in available sources.
Leptodeuterocopus neales
Everglades Plume Moth
Leptodeuterocopus neales is a small plume moth in the family Pterophoridae, commonly known as the Everglades Plume Moth. It is native to the Neotropics with a recent expansion into Florida. The species has a wingspan of approximately 13 mm and adults are active during most months of the year in its native range.
Listrus senilis
Listrus senilis is a small soft-winged flower beetle (family Melyridae, subfamily Dasytinae) distributed across the Great Plains of North America. Adults are typically found feeding on pollen of yellow-flowered asteraceous plants, particularly Heterotheca species. The species was redescribed by Mawdsley (1999) who provided notes on its biology.
Macronaemia episcopalis
Episcopal Ladybird
Macronaemia episcopalis is a small lady beetle species in the family Coccinellidae, known by the common name Episcopal Ladybird. Adults measure approximately 3.25–4 mm in length. The species is distributed across North America from Ontario and New York westward to Yukon and northern California, with additional records from Canadian provinces including Alberta, British Columbia, and Manitoba. The genus Macronaemia currently contains three described species.
Malacocoris chlorizans
delicate apple capsid
Malacocoris chlorizans is a small green plant bug in the family Miridae, commonly known as the delicate apple capsid. The species is predatory, feeding on mites and aphids in deciduous tree canopies, particularly hazel. Adults are active from spring through autumn. It is native to Europe and extends eastward to the Caspian Sea region.
Mecas femoralis
Mecas femoralis is a small longhorn beetle (family Cerambycidae) described by Haldeman in 1847. It is found in the southeastern United States and is considered largely endemic to Florida. The species measures 6–8 mm in length and can be distinguished by its rather uniform pubescence, lack of pronotal calluses, and reddish femora. It has been collected by sweeping dried grasses in open oak/pine sandhill woodland habitats.
Melanoliarus pygmaeus
Melanoliarus pygmaeus is a species of planthopper in the family Cixiidae, described by Ball in 1937. The genus Melanoliarus belongs to the order Hemiptera, suborder Auchenorrhyncha, and infraorder Fulgoromorpha. Cixiidae planthoppers are typically small to medium-sized insects associated with woody vegetation. The specific epithet "pygmaeus" (meaning dwarf or pygmy) suggests this species is notably small even within its genus.
Menestomorpha oblongata
Menestomorpha oblongata is a small moth in the family Depressariidae, first described by Walsingham in 1907. It is known from limited records in Florida, Arizona, and California. The species has a wingspan of approximately 15 mm and distinctive forewing patterning with brown bands forming a V-shape. It has been reared from cynipid galls on Quercus (oak) species, indicating a specific ecological association with gall-forming wasps and their oak hosts.
Micaria foxi
Micaria foxi is a small ant-like spider in the family Gnaphosidae, first described by Gertsch in 1933. It belongs to the M. rossica/M. foxi species group, which forms a phylogenetic clade sister to M. formicaria. Like other Micaria species, it is distinguished by piriform gland spigots similar in size to major ampullate gland spigots. The species is known from North America, with records from the United States and Canada including Alberta and British Columbia.
Micratopus
Micratopus is a genus of small ground beetles in the family Carabidae, established by Casey in 1914. The genus comprises seven described species distributed across the Caribbean, South America, and North America. Members of this genus belong to the tribe Bembidiini and are characterized by their diminutive size, a trait reflected in the genus name. Several species have been described relatively recently, with three new species named in 2021 from the Lesser Antilles.
Ministrymon
ministreaks
Ministrymon is a genus of small butterflies in the family Lycaenidae, commonly known as ministreaks. The genus was established by Clench in 1961 and contains approximately 20 described species distributed across the Nearctic and Neotropical realms. Species are diminutive, typically about the size of a thumbnail. The genus includes Ministrymon janevicroy (Vicroy's Ministreak), a recently described species from Texas distinguished by its distinctive olive-green eyes.
Molorchus
Molorchus is a genus of small longhorn beetles (Cerambycidae) in the tribe Molorchini. Adults are known for their striking resemblance to ants, representing a clear case of Batesian mimicry. The genus contains multiple subgenera and species distributed across North America, Europe, and Asia. Adults are frequently encountered on flowers, particularly those of dogwood (Cornus spp.), where they feed on pollen and nectar.
Mulsantina cyathigera
Ivory Lady Beetle
Mulsantina cyathigera is a small lady beetle (Coccinellidae) native to Central and North America, ranging from Guatemala through Mexico to the southern United States. Adults measure 3.3–4.7 mm and are characterized by a yellow body with distinctive brown markings: an M-shaped pattern on the pronotum and six spots on the elytra. The species is commonly known as the Ivory Lady Beetle.
Mulsantina luteodorsa
clay-colored lady beetle, Saffron Lady Beetle
A small lady beetle measuring 3.8–4.6 mm, endemic to the southeastern United States. The pronotum is yellow with two black vittae, and the elytra are unmarked. It is one of the lesser-known species in the genus Mulsantina.
Nasusina minuta
Nasusina minuta is a small geometrid moth first described by George Duryea Hulst in 1896. It is restricted to arid regions of the southwestern United States, where adults are active primarily in spring with additional late-season emergences. The species is notable for its diminutive size among geometrid moths.
Neodactylota egena
Neodactylota egena is a small gelechiid moth described by Ronald W. Hodges in 1966. It is known from limited records in the southwestern United States, specifically California and Arizona. The species is characterized by its modest size and relatively plain gray-brown forewings with subtle discal markings.
Neodavisia singularis
Neodavisia singularis is a species of snout moth in the family Pyralidae. It was described by William Barnes and James Halliday McDunnough in 1913 based on specimens collected in the Everglades region of Florida. The species is known only from Florida and remains poorly documented, with few subsequent records. Its small size and restricted distribution make it a rarely encountered species.
Neonemobius
Small Ground Crickets
Neonemobius is a genus of small ground crickets in the family Trigonidiidae, subfamily Nemobiinae. The genus was established by Hebard in 1913 and contains six recognized species, all native to North America. Members are small-bodied crickets typically found in ground-level habitats.
Nomotettix cristatus
crested pygmy grasshopper, crested grouse locust, northern crested grouse locust
Nomotettix cristatus is a small pygmy grasshopper in the family Tetrigidae, commonly known as the crested pygmy grasshopper or crested grouse locust. It is one of approximately 35 Nearctic species of Tetrigidae. The species exhibits three recognized subspecies with distinct geographic distributions across North America. Like other members of its family, it is characterized by an elongated pronotum that extends over the abdomen, a trait distinguishing pygmy grasshoppers from typical grasshoppers in Acrididae.
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stemhumanRelevanceinteraction-with-humanssimilarTaxamust-include-reasonmisconceptionsonly-if-meaningfulextraDetailsimportant-additional-contextSTYLE-RULESclear-direct-sentencesavoid-fluff-filler-languagerepeating-taxonomy-in-proseoverly-technical-jargonconcrete-statementsabstract-descriptionsQUALITY-RULEScompleteness-highmost-fields-well-supportedcompleteness-mediumpartial-but-reliablecompleteness-lowsparse-datahasInferredContenttrue-ONLY-if-generalization-usedotherwise-falseOUTPUT-FORMATstrictly-match-JSON-schemano-extra-fieldsno-commentary-outside-JSONwater-associatedthree-subspeciesN.-c.-cristatusN.-c.-compressusN.-c.-floridanussmall-size399-observationsexact-matchmedium-completenessno-inferred-contentfactual-correctness-prioritizedconservative-approachinformative-contentno-fluffno-vague-generalizationscautious-language-where-neededno-fabricationunique-field-contentfocused-sectionsJSON-schema-complianceno-commentaryOdontocorynus umbellae
Daisy Flower Weevil
A small flower-feeding weevil, 3–5 mm in length, with brown or black coloration. The species is distinguished by a rostrum that curves heavily at the base but becomes nearly straight near the apex. Adults are active during the growing season and feed on flowers of several plant families.