Univoltine
Guides
Cimbex americanus
elm sawfly, North American Elm Sawfly
Cimbex americanus, commonly known as the elm sawfly, is a large, non-stinging sawfly in the family Cimbicidae. Adults measure approximately 20–30 mm in body length and are among the largest sawflies in North America. The species exhibits sexual dimorphism in coloration: males have yellow-orange abdomens, while females display black abdomens with yellow transverse bands. Larvae feed on foliage of various broadleaf trees, particularly elm and willow, and can reach 50 mm in length. The species has a single generation per year, with larvae overwintering in soil cocoons before pupating in spring.
Cissusa indiscreta
Indiscreet Cissusa Moth, Indiscrete Cissusa Moth
Cissusa indiscreta is a moth species in the family Erebidae, distributed across western North America from British Columbia to central Colorado. Adults are active in spring with a single annual generation. Larvae are specialized feeders on Quercus species.
Citheronia regalis
Regal Moth, Royal Walnut Moth
Citheronia regalis is a large North American saturniid moth known as the regal moth or royal walnut moth. Its larval stage, the hickory horned devil, is one of the largest caterpillars in North America north of Mexico and is notable for its striking appearance with prominent red and black horns. Adults have vestigial mouthparts and do not feed, living only about a week to mate and lay eggs. The species has a single generation per year throughout most of its range.
Citheronia sepulcralis
pine-devil moth
Citheronia sepulcralis, commonly known as the pine-devil moth, is a giant silk moth in the family Saturniidae. Adults are blackish-brown in color and lack functional mouthparts. The species occurs across the eastern and southeastern United States, with larvae feeding exclusively on pine species. Multiple broods occur in southern regions, while northern populations are univoltine.
Cleora sublunaria
double-lined gray moth, Double-lined Gray
Cleora sublunaria, known as the double-lined gray moth, is a geometrid moth species native to North America. Adults are active primarily from February to June with a single annual generation. The species exhibits sexual dimorphism in forewing length, with males measuring 13–17 mm and females 14–17 mm. Larvae feed on oak (Quercus) and sweetfern (Comptonia) species.
Clinocerinae
aquatic dance flies
Clinocerinae is a subfamily of dance flies (Empididae) comprising 16 recognized genera including Clinocera, Wiedemannia, Dolichocephala, Trichoclinocera, and Kowarzia. Members are commonly known as aquatic dance flies due to their strong association with freshwater habitats. The subfamily has a global distribution with particularly diverse faunas in the Palaearctic and Oriental regions. Multiple generic revisions and species-level revisions have been published for Nearctic, Palaearctic, and Oriental faunas.
Coenonympha tullia ochracea
Large Heath, Ochraceous Ringlet
Coenonympha tullia ochracea is a subspecies of the Large Heath butterfly, a satyrine nymphalid found in peatland and bog habitats across northern Europe and North America. This subspecies exhibits the characteristic orange-ochre coloration that distinguishes it from other C. tullia forms. The species is notable for its association with intact blanket bog ecosystems, where it serves as an indicator of healthy peatland conditions. Like other Coenonympha species, it faces threats from habitat degradation, drainage, and wildfire.
Colaspis brunnea
grape colaspis
Colaspis brunnea, commonly known as the grape colaspis, is a small leaf beetle native to eastern North America. Adults are brown in color and approximately 5 mm in length, with elytra bearing parallel rows of puncture marks. The species is univoltine, overwintering as larvae in the soil. While it has been observed feeding on crops including corn and soybeans, documented economic damage remains limited.
Colaspis crinicornis
Colaspis crinicornis is a leaf beetle species in the family Chrysomelidae, native to the Great Plains of the United States. It was described by Schaeffer in 1933. Historically not considered a pest, its populations have increased substantially in corn and soybean fields in southeastern Nebraska over the past decade. The species has a univoltine life cycle, overwintering as larvae in soil and emerging as adults in summer. Adults feed on above-ground foliage while larvae feed on below-ground plant portions.
Coleophora badiipennella
Pale Elm Case-bearer
Coleophora badiipennella is a small case-bearing moth in the family Coleophoridae, first described by Duponchel in 1843. It is widely distributed across Europe and has been introduced to North America. The species is associated with several deciduous tree genera, particularly elms. Adults are active in early summer.
Coleotechnites apicitripunctella
Green Hemlock Needleminer, Hemlock Leaf Miner, Baldcypress Webworm
A small gelechiid moth whose larvae mine needles of eastern hemlock and bald cypress. The species has one generation annually and occurs in eastern North America. Larvae are distinctive with yellowish-green bodies, orange-brown heads, and dark green spots.
Coleotechnites atrupictella
Spruce Micromoth
A small gelechiid moth with a wingspan of 9–10 mm, recognized by its distinctive blackish forewing fasciae. The larvae are folivores on conifers, feeding on spruce, pine, hemlock, Douglas-fir, and subalpine fir. The species is univoltine, with adults active from April to September and larvae present in June and July. It overwinters as an egg.
Coleotechnites laricis
orange larch tubemaker
Coleotechnites laricis, the orange larch tubemaker, is a small gelechiid moth with a wingspan of 10.5–13 mm. It is found in eastern Canada and the north-eastern United States, where its larvae are specialized feeders on eastern larch. The species has one generation per year.
Coleotechnites macleodi
brown hemlock needleminer
A small gelechiid moth known for its specialized relationship with eastern hemlock. The common name refers to its larval habit of mining within hemlock needles. It completes one generation annually in its northern range.
Coleotechnites thujaella
brown arborvitae leafminer, brown cedar leafminer
Coleotechnites thujaella is a small gelechiid moth commonly known as the brown arborvitae leafminer or brown cedar leafminer. It occurs in northeastern North America, where its larvae feed internally on Thuja foliage. The species is recognized by its distinctive wing pattern of black triangular costal patches and paired black dots on cream-white forewings. Adults have a wingspan of 9–10 mm and are active in a single annual generation.
Colias interior
pink-edged sulphur
Colias interior, commonly known as the pink-edged sulphur, is a North American butterfly in the family Pieridae. It is the state butterfly of Maine. The species is univoltine, with adults active from June through August. Females lay eggs on blueberry plants (Vaccinium species), and larvae feed primarily on Vaccinium myrtilloides. The species enters diapause as larvae and is known to hybridize with the multivoltine Colias philodice, with hybrids exhibiting abnormal diapause dynamics.
Colias palaeno
Moorland Clouded Yellow, Palaeno Sulphur, Pale Arctic Clouded Yellow
Colias palaeno is a Holarctic butterfly species in the family Pieridae, occurring across northern Eurasia and North America. It inhabits moorlands, bogs, and open coniferous forests, with southern populations restricted to high alpine zones above 1,500 meters. The species has experienced significant declines in parts of its European range, particularly in Bavaria, where larval survival depends critically on microclimatic conditions associated with Sphagnum moss. It is univoltine, with adults flying from June to August.
Colias pelidne
Pelidne Sulphur, Blueberry Sulphur
Colias pelidne is a small sulphur butterfly in the family Pieridae found in North America. It inhabits high-elevation tundra and mountain environments, with a flight period restricted to late June through early August. The species has a broad geographic range spanning from British Columbia across Canada to Newfoundland, with southern extensions into Idaho, Montana, and Wyoming. Both larval and adult stages have documented feeding associations with specific plant taxa.
Compsidolon salicellum
Compsidolon salicellum is a plant bug in the family Miridae native to the Palearctic region, with established adventive populations in North America. It inhabits sunny forest edges and isolated bushes, showing a preference for common hazel (Corylus avellana) while occasionally utilizing other deciduous shrubs. The species exhibits zoophytophagous feeding behavior and has a single annual generation with adults active from mid-July through late September.
Conotrachelus schoofi
Pecan Shoot Curculio
Conotrachelus schoofi is a weevil species in the family Curculionidae that feeds on pecans. Adults cause premature nut drop by feeding on pecan nutlets. Larvae develop within the nuts, completing their growth inside the shuck. The species has one generation per year, with adults emerging in spring and overwintering in diapause.
Copablepharon grandis
pale yellow dune moth
Copablepharon grandis, the pale yellow dune moth, is a noctuid moth species described by Strecker in 1878. It is distributed across western and central North America, inhabiting dune ecosystems. Adults are active in mid-summer with a single annual generation. The species is closely associated with sandy habitats, reflecting its common name.
Corydalus cornutus
Eastern Dobsonfly, Hellgrammite (larval form), Go-devil, Grampus
Corydalus cornutus, the eastern dobsonfly, is among the largest insects in eastern North America, with adults reaching 140 mm in length and wingspans up to 130 mm. The species exhibits pronounced sexual dimorphism: males possess elongated, sickle-shaped mandibles up to 40 mm long used in combat with rivals, while females have shorter, powerful mandibles capable of delivering a painful bite. The aquatic larval stage, known as hellgrammites, are apex invertebrate predators in fast-flowing streams, feeding on other aquatic insects for one to three years before emerging to pupate in terrestrial soil chambers. Adults are short-lived, non-predatory, and primarily nocturnal, attracted to lights near waterways.
Corythucha juglandis
Walnut Lace Bug
Corythucha juglandis, the walnut lace bug, is a univoltine or bivoltine lace bug (Hemiptera: Tingidae) native to North America and specialized on walnut (Juglans) host plants. Adults overwinter in leaf litter and become active in April or May, synchronizing with host leaf phenology. The species aggregates on the undersides of leaflets for feeding and reproduction. Both adults and nymphs are gregarious. It has been studied in Ontario, Québec, Canada, and southern Illinois, USA, with some geographic variation in voltinism reported.
Crambus tutillus
sod webworm
Crambus tutillus is a sod webworm moth in the family Crambidae, described by McDunnough in 1921. It is univoltine with a life cycle tightly regulated by photoperiod and temperature. Larvae develop through nine instars, overwintering as diapausing eighth instars, with adults emerging in mid-May and reproducing through June and July. The species exhibits an unusual adaptive response where early instar growth rates increase as daylength decreases, synchronizing development with seasonal food availability.
Culiseta alaskaensis
Alaskan winter mosquito
Culiseta alaskaensis, the Alaskan winter mosquito, is a Holarctic mosquito species adapted to cold subarctic and arctic environments. It has a univoltine life cycle with larvae overwintering and adults emerging in late summer. Females exhibit a distinctive reproductive strategy: they are autogenous for their first egg batch, producing eggs without a blood meal, but require blood for subsequent batches. Adults enter hibernation shortly after emergence without mating or feeding, with mating deferred until spring.
Cyclocephala lurida
Southern Masked Chafer
Cyclocephala lurida, commonly known as the southern masked chafer, is a scarab beetle native to the southeastern United States. Adults are small brown beetles with distinctive black facial markings, measuring 10–14 mm in length. The species is univoltine, with adults active primarily in June and July. While adults do not feed on plants and cause no damage, the subterranean larvae—known as white grubs—are significant turfgrass pests that feed on grass roots and can cause extensive lawn damage under dry conditions.
Dactylotum bicolor
Rainbow grasshopper, Painted grasshopper, Barber pole grasshopper
Dactylotum bicolor is a small, flightless grasshopper known for its striking aposematic coloration of black with red, yellow, and green markings. Native to shortgrass prairie and desert grasslands of western North America, it exhibits a complex life cycle with nymphs showing specialized feeding behavior on Wright's false willow (Baccharis wrightii) in parts of its range. The species demonstrates active thermoregulation through behavioral positioning relative to host plants and sunlight. Its bright warning coloration has been experimentally validated as effective aposematism against vertebrate predators.
Dasychira vagans
Variable Tussock Moth
Dasychira vagans is a moth in the family Erebidae, first described by Barnes and McDunnough in 1913. The species exhibits notable sexual dimorphism in forewing length, with males measuring 14–18 mm and females 22–24 mm. Adults are active from June to August with a single generation per year. The larvae feed on a broad range of woody plants across multiple families, with a documented preference for Quercus (oak) species. Two subspecies are recognized: D. v. vagans in eastern North America and D. v. grisea ranging from southern Manitoba to the Pacific Northwest.
Datana ministra
yellownecked caterpillar, Yellow-necked Caterpillar Moth
Datana ministra is a moth in the family Notodontidae, commonly known as the yellownecked caterpillar. The species is distributed across southern Canada and the eastern United States, extending west to California. Adults have a wingspan of approximately 42 mm and produce one generation per year. The larvae are notable defoliators of various hardwood trees.
Dendroctonus adjunctus
roundheaded pine beetle
Dendroctonus adjunctus, commonly known as the roundheaded pine beetle, is a bark beetle native to North America that infests and kills pine trees. Adults are 5–6 mm long with shiny, dark brown to black exoskeletons covered in hairs. The species has a one-year life cycle, with adults colonizing weakened pine trees in autumn, constructing extensive egg galleries in the cambium and phloem. Outbreaks can be devastating, killing up to 50% of pines in pure stands. The beetle is distributed across the southwestern United States and Mexico, and is considered a serious pest of commercial and wild pine stocks.
Depressaria
Depressaria is a genus of moths in the family Depressariidae (subfamily Depressariinae), previously treated as part of Oecophoridae or as a distinct family. The genus contains approximately 80+ described species, with new species continuing to be discovered. Most species are specialists on Apiaceae (umbellifers), feeding on reproductive structures, though some species utilize Salicaceae (willows). Several species are economically significant agricultural pests or invasive species in North America, including D. depressana (purple carrot-seed moth) and D. radiella (parsnip webworm). The type species, D. heraclei (parsnip moth), has a confused taxonomic history dating to Linnaeus.
Depressaria radiella
parsnip moth, parsnip webworm
Depressaria radiella is a Eurasian moth introduced to North America in 1862 (Ontario) and New Zealand in 2004. It is a 'superspecialist' herbivore effectively restricted to two closely related apiaceous genera (Heracleum and Pastinaca) throughout its native and introduced ranges. The species is univoltine, with adults active from August through May after overwintering. It has undergone slow westward expansion across North America over 160+ years, reaching the West Coast only after more than 50 years. The species exhibits lower genetic diversity than its congener D. depressana, possibly reflecting its narrow host specialization.
Deraeocoris ruber
red-spotted plant bug, Mirid Bug
Deraeocoris ruber, commonly known as the red-spotted plant bug, is a medium-sized predatory mirid bug native to Europe that has been introduced to the Nearctic and Neotropical realms. Adults measure 6–8 mm and display variable coloration from light brown or orange to black, with a diagnostic red cuneus. The species is univoltine, with adults active from July to September. It is an important biological control agent, feeding primarily on aphids and other small insects.
Desmona bethula
amphibious caddisfly
Desmona bethula, commonly known as the amphibious caddisfly, is a species of northern caddisfly in the family Limnephilidae. It is notable for its unusual terrestrial feeding migration behavior, in which fifth-instar larvae leave streams at night to feed on semiaquatic plants before returning to the water. This species is univoltine with autumn emergence and has been proposed as a potential evolutionary link between aquatic and secondarily terrestrial caddisfly lineages.
Dichomeris ligulella
palmerworm, Palmerworm Moth
Dichomeris ligulella, commonly known as the palmerworm, is a small gelechiid moth native to eastern North America. Adults are active from spring through fall with a single generation per year. The species is economically notable as a foliar feeder on several hardwood trees and orchard crops.
Dichrorampha aeratana
Obscure Drill
Dichrorampha aeratana is a small tortricid moth native to Europe, first described in 1915. The species has gained scientific attention as a potential biological control agent for the invasive weed oxeye daisy (Leucanthemum vulgare) in North America and Australia. Adults are active in spring, with larvae feeding internally on host plant roots and rhizomes. The moth exhibits strong host specificity, with larval survival negatively associated with increasing ploidy levels in host plants.
Dichrorampha sedatana
Dingy Drill
Dichrorampha sedatana is a small tortricid moth with a wingspan of 12–16 mm. Adults are active from April to June, with one generation per year. The larvae are root feeders, specializing on Asteraceae hosts including Tanacetum vulgare and related species. The species is widespread across Europe and occupies rough meadows and wayside habitats.
Dictyla echii
Bugloss Lace Bug
A lace bug (Hemiptera: Tingidae) native to the Palearctic and introduced to North America. In Canada, it is univoltine and overwinters as adults in soil near host plant rosettes in reproductive diapause. In the Mediterranean region, it produces at least 2–3 generations annually. Associated primarily with Boraginaceae, especially Echium species. Tested as a biological control agent for Echium plantagineum (Paterson's curse) in Australia but rejected due to insufficient host specificity.
Dioryctria albovittella
pinyon tip moth
Dioryctria albovittella, commonly known as the pinyon tip moth, is a pyralid moth native to North America. The species is a specialist herbivore whose larvae feed within shoots and cones of pinyon pine (Pinus edulis), causing damage that can alter tree form and reduce cone production. Adults are active in mid-summer with a single annual generation. Taxonomic uncertainty exists, as specimens historically identified as D. albovittella across a broad geographic range may represent a species complex.
Dioryctria resinosella
red pine shoot moth
Dioryctria resinosella is a conifer-feeding moth in the family Pyralidae, described in 1982. The larvae are specialized shoot borers of red pine (Pinus resinosa), attacking new shoots and cones. This species exhibits localized infestation patterns within plantations and has a univoltine life cycle with discrete seasonal activity. It is known from Ontario and the northern United States, with detailed bionomics studied in Wisconsin sand plain plantations.
Dioryctria zimmermani
Zimmerman pine moth
Dioryctria zimmermani, the Zimmerman pine moth, is a conifer-feeding moth in the family Pyralidae. It is a significant pest of pine trees in the midwestern and northeastern United States and southern Canada. The species has one generation per year, with adults emerging in late August and eggs hatching through mid-September. Larvae bore into pine bark and cones, causing damage to host trees.
Diploperla
springflies
Diploperla is a genus of springflies (family Perlodidae) comprising five described species found in eastern North America. These stoneflies inhabit stream environments where their nymphs develop as predators in leaf packs and riffle areas. The genus exhibits univoltine life cycles with adult emergence occurring in spring.
Disholcaspis prehensa
clasping twig gall wasp
Disholcaspis prehensa is a gall-inducing cynipid wasp native to California that induces distinctive galls on scrub oak and leather oak. The species exhibits heterogony, alternating between sexual and asexual generations that produce two morphologically different gall types. The asexual generation forms conspicuous mushroom-shaped twig galls with clasping bases, while the sexual generation produces small, hidden bud galls.
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Diura is a genus of stoneflies (Plecoptera) in the family Perlodidae, comprising approximately seven described species distributed across Europe and North America. Species such as Diura nanseni are univoltine, completing their life cycle in one year with nymphal growth primarily during spring months. Nymphs are typically associated with lotic environments and exhibit predatory or grazing feeding habits depending on species.
Dryocosmus minusculus
Pumpkin Gall Wasp
Dryocosmus minusculus is an abundant cynipid wasp endemic to California. The species induces small, round galls on oak leaves, commonly called pumpkin galls. Adults emerge in spring after overwintering as larvae within galls. The species is strictly associated with three oak species in the region.
Eacles imperialis
Imperial Moth
Eacles imperialis is a large saturniid moth with the widest geographic range in its genus, extending from southern Canada to Argentina. Adults display substantial color variation, with yellow base coloration and variable red, brown, and purple markings. The species has experienced regional decline in the northeastern United States, with some New England populations extirpated, while remaining common in the Mid-Atlantic, Appalachia, and Deep South.
Ectobius
wood cockroaches, field cockroaches
Ectobius is a genus of small, cool-adapted cockroaches in the family Ectobiidae. Adults measure 6–12 mm in length with brown to yellowish coloration and pale margins. The genus has a complex biogeographic history: fossil evidence from the 49-million-year-old Green River Formation in Colorado indicates Ectobius originated in North America, despite its long absence from the continent until recent reintroductions. Species are primarily distributed across Europe, Africa, the eastern Palearctic, and the Near East. Several species have been introduced to northeastern North America within the last 65 years, where Ectobius lapponicus has become synanthropic.
Einfeldia
non-biting midges
Einfeldia is a genus of non-biting midges in the subfamily Chironominae, tribe Chironomini, within the bloodworm family Chironomidae. The genus was established by Kieffer in 1924 and contains approximately 11 described species distributed across Europe, North America, and other regions. At least one species, E. synchrona, has been studied in detail and exhibits univoltine life history with synchronized adult emergence.
Elaphria alapallida
Pale-winged Midget
Elaphria alapallida is a small owlet moth in the family Noctuidae, described in 2003 when it was split from the similar E. festivoides. It occurs across southern Canada and the northern United States. Adults fly from May to July and are attracted to light sources.
Elaphrus viridis
Delta Green Ground Beetle
Elaphrus viridis is a small, metallic-green ground beetle endemic to a restricted region in Solano County, California. It is closely associated with vernal pool habitats, where its life cycle is tied to seasonal flooding and drying patterns. The species is federally listed as threatened and IUCN Critically Endangered due to its extremely limited range and habitat loss. Adults are active during the wet season, emerging in January and becoming dormant by May when pools dry.