Aquatic-insect
Guides
Triaenodes baris
Triaenodes baris is a species of long-horned caddisfly in the family Leptoceridae, described by Ross in 1938. The species is found in North America and belongs to a genus characterized by elongated antennae in adults. As with other Leptoceridae, larvae likely inhabit aquatic environments and construct portable cases from plant material.
Triaenodes flavescens
Triaenodes flavescens is a species of long-horned caddisfly in the family Leptoceridae, described by Banks in 1900. It belongs to a genus characterized by elongated antennae that often exceed body length. The species is known from North America. As with other members of Leptoceridae, adults are associated with aquatic habitats where larvae develop.
Triaenodes injusta
Triaenodes injusta is a species of long-horned caddisfly in the family Leptoceridae. The genus Triaenodes is characterized by elongated antennae, often exceeding body length, and larvae that construct distinctive portable cases. This species is part of a diverse Nearctic fauna of Triaenodes, though specific biological details remain limited in published literature.
Triaenodes marginata
Triaenodes marginata is a species of caddisfly in the family Leptoceridae. The genus Triaenodes belongs to the tribe Triaenodini within the subfamily Leptocerinae. The species has been treated taxonomically with at least one recognized synonym, Triaenodes marginata tarda Milne, 1934, which is now considered a synonym of Triaenodes tardus. Information regarding the biology, ecology, and distribution of this specific species is limited in the provided sources.
Triaenodes tardus
long-horned caddisfly
Triaenodes tardus is a North American long-horned caddisfly in the family Leptoceridae. Larvae construct portable cases and are capable swimmers, using setae on their extended metathoracic legs to move between aquatic macrophytes. Swimming speed averages 1.47 cm/s even while carrying cases nearly double their body mass. The species exhibits reduced swimming activity when vegetation is available, indicating swimming functions primarily for habitat relocation rather than escape.
Trichocorixa kanza
water boatman
Trichocorixa kanza is a species of water boatman (family Corixidae) described by Sailer in 1948. It belongs to the genus Trichocorixa, a group of small aquatic true bugs characterized by hair-fringed hind legs adapted for swimming. The species has been documented in both North and Central America. Like other corixids, it inhabits freshwater environments where it swims upside-down near the water surface.
Trichocorixa minima
Trichocorixa minima is a small water boatman in the family Corixidae, first described by Abbott in 1913. It belongs to a genus of aquatic true bugs found in various freshwater habitats. The species is recorded from North America and the Caribbean, though detailed ecological information remains limited. Like other Corixidae, it is adapted to life in water with oar-like hind legs for swimming.
Tricorythodes explicatus
Tricorythodes explicatus is a species of small mayfly in the family Leptohyphidae, first described by Eaton in 1892. It belongs to a genus commonly known as stout crawler mayflies, characterized by reduced wing venation and robust body proportions. The species has been documented in Middle America and North America, though detailed biological studies remain limited.
Tsalia berneri
Tsalia berneri is a species of mayfly in the family Ephemerellidae, originally described as Ephemerella berneri by Allen & Edmunds in 1958. The genus Tsalia was later established to accommodate this and related species based on distinctive morphological features. This Nearctic species is known from limited records in North America. Like other members of Ephemerellidae, it is a small to medium-sized mayfly with aquatic nymphal stages.
Typopsilopa nigra
Typopsilopa nigra is a species of shore fly in the family Ephydridae, first described by Williston in 1896. Shore flies in this family are generally associated with moist habitats including shorelines, wetlands, and aquatic environments. The specific epithet 'nigra' refers to its dark coloration. Very few observations of this species have been documented, with only a single observation recorded on iNaturalist.
Visoka
Visoka is a genus of small winter stoneflies in the family Nemouridae, established by Ricker in 1952. These insects are part of the order Plecoptera, a group of aquatic insects whose nymphs inhabit cold, well-oxygenated freshwater environments. The genus has been recorded from western North America including Alberta, Alaska, British Columbia, California, and Idaho. As with other nemourids, adults are typically small with reduced wing venation.
Visoka cataractae
Cataract Forestfly
Visoka cataractae is a species of stonefly in the family Nemouridae, commonly known as the Cataract Forestfly. It is a small, winter-emerging stonefly distributed across western North America from Alaska to California. The species was originally described as Nemoura cataractae by Neave in 1933 before being transferred to the genus Visoka. Like other nemourids, it is associated with forested stream habitats.
Wormaldia
Wormaldia is a diverse genus of fingernet caddisflies (family Philopotamidae), comprising approximately 175 extant species globally. It is the second-largest genus in Philopotamidae after Chimarra. Species occur across all biogeographic regions except Australasia, with notable diversification in the Neotropics and Nearctic. The genus includes fossil species from Late Cretaceous Burmese amber, indicating an ancient evolutionary history. Taxonomic revisions have focused heavily on male genitalia morphology for species identification.
Wormaldia arizonensis
Wormaldia arizonensis is a species of caddisfly in the family Philopotamidae, originally described by Ling in 1938. It belongs to the second largest genus in its family, with approximately 175 extant species worldwide. The species is known from the southwestern United States and Mexico. As with other philopotamid caddisflies, it is presumed to have aquatic larval stages and terrestrial adult stages, though specific details of its biology remain poorly documented.
Wormaldia moesta
fingernet caddisfly
Wormaldia moesta is a species of fingernet caddisfly described by Banks in 1914. It belongs to the family Philopotamidae, a group of caddisflies characterized by their distinctive net-spinning larval behavior. The species has been documented in North America, with specific records from Vermont in the United States.
Yoraperla
roach-like stoneflies
Yoraperla is a genus of stoneflies in the family Peltoperlidae, commonly known as "roach-like stoneflies" due to their resemblance to cockroaches. The genus contains eight described species distributed across North America and Asia. Yoraperla was established by Ricker in 1952 and is classified within the subfamily Peltoperlinae.
Yugus
Yugus is a genus of stoneflies in the family Perlodidae, established by Ricker in 1952. Members of this genus are part of the diverse Nearctic stonefly fauna, with documented occurrence in the eastern United States. As with other perlodid stoneflies, they are aquatic insects with nymphal stages in streams and rivers. The genus is classified within the tribe Perlodini, reflecting close relationships with other genera in this group.
Zaitzevia
riffle beetles
Zaitzevia is a genus of riffle beetles (family Elmidae) comprising approximately 19–29 described species, depending on taxonomic treatment. The genus was established by George Charles Champion in 1923 and is named after Russian entomologist Filipp Zaitsev. Species diversity is concentrated in East, Southeast, and Central Asia, with additional representation in North America. Chinese species are particularly well-documented, with multiple new species described from Sichuan, Yunnan, Hunan, Hubei, and Guizhou provinces.
Zapada
forestflies, spring stoneflies, little brown stoneflies
Zapada is a genus of small spring stoneflies in the family Nemouridae, commonly known as forestflies or little brown stoneflies. The genus contains at least 10 described species distributed across western North America, from Alaska and the Rocky Mountains to California. Adults are 5–8 mm in body length and emerge in early spring, often February through April depending on elevation and species. Nymphs are aquatic shredders that process leaf litter and other organic matter in cold, well-oxygenated streams.
Zapada cinctipes
Common Forestfly
Zapada cinctipes, the common forestfly, is a small spring stonefly in the family Nemouridae. Adults measure 5–8 mm in body length and emerge primarily from mid-March to mid-April, with some appearing as early as late February. The species is univoltine, completing one generation per year. Nymphs are aquatic shredders that feed on decaying leaf material in flowing waters.
Zapada columbiana
Columbian forestfly
Zapada columbiana is a species of spring stonefly in the family Nemouridae, commonly known as the Columbian forestfly. It is a small stonefly with a life cycle spanning 2-3 years in Rocky Mountain streams. The species is notable for retaining cervical gills into adulthood, a diagnostic feature of the genus. Nymphs are shredders that feed on moss and detritus, playing a significant role in stream ecosystem nutrient cycling.
Zapada cordillera
Cordilleran Forestfly
Zapada cordillera is a species of spring stonefly in the family Nemouridae, commonly known as the Cordilleran Forestfly. Described in 1971 from specimens in the western United States, this small aquatic insect is part of a genus whose nymphs are characterized by distinctive branched cervical gills retained into adulthood. As a member of the Nemouridae, it contributes to stream ecosystem function as a leaf-shredding detritivore and serves as an indicator of water quality in its montane habitat.
Zavrelimyia bifasciata
Zavrelimyia bifasciata is a species of non-biting midge in the family Chironomidae, subfamily Tanypodinae. It belongs to the tribe Pentaneurini, a group of predatory midges commonly found in aquatic environments. The species was described by Coquillett in 1901. As a member of the Tanypodinae, it is likely predatory in the larval stage, though specific ecological details remain poorly documented.
Zavrelimyia fragilis
Zavrelimyia fragilis is a species of non-biting midge in the family Chironomidae. Like other members of this family, it belongs to the order Diptera and is characterized by a life cycle that includes aquatic larval stages. The genus Zavrelimyia is part of the diverse chironomid fauna, with larvae typically inhabiting freshwater environments. Adult midges are generally short-lived and do not feed.