Corydalus texanus

Banks, 1903

Western Dobsonfly

Corydalus texanus is a large megaloopteran insect commonly known as the Western . are among the largest winged insects in their range, with males distinguished by elongated sickle-shaped used in combat with rivals. Females possess shorter but powerful jaws capable of delivering a painful bite. The aquatic larval stage, known as hellgrammites, are and serve as important indicators of stream health. Adults are attracted to lights and may be observed near water bodies at night.

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Pronunciation

How to pronounce Corydalus texanus: /kɔˈrɪdələs tɛkˈsænəs/

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Identification

Males identified by extremely elongated, sickle-shaped used in male-male combat; females have shorter, powerful mandibles. Large size distinguishes them from most other insects in range. Similar to Corydalus cornutus (Eastern Dobsonfly) but with western distribution. have large wings and divided . Larval hellgrammites have gills along abdominal margins and allowing amphibious respiration.

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Habitat

Associated with freshwater streams and rivers. Larvae (hellgrammites) inhabit rapidly flowing streams, living in spaces between stones and vegetation in the benthos. found near water bodies, often attracted to lights on buildings near waterways.

Distribution

Western North America. Present in North America according to GBIF records. Western counterpart to the eastern Corydalus cornutus.

Seasonality

active during summer months. Larval development takes one to three years. Adults may be encountered in the morning near lighted structures after nighttime activity.

Diet

have liquid diet, not predatory. Larvae (hellgrammites) are , feeding on mayflies, stoneflies, and .

Life Cycle

Complete with aquatic larval and terrestrial pupal stages. Females deposit on vegetation overhanging water; hatchlings drop into stream. Larvae (hellgrammites) develop in water for 1-3 years, then climb out to build pupal chambers beneath moist stones, logs, or other protected structures on land. emerge from pupal chambers.

Behavior

males use elongated in combat to dislodge rivals from substrates near potential mates. Adults attracted to light. When cold, adults engage in rapid wing-fluttering (shivering thermogenesis) to warm muscles for takeoff. Larvae are ambush in stream benthos.

Ecological Role

Larvae serve as key bioindicators of stream health, absent from polluted waters. Important prey item for fish. contribute to nutrient cycling and may serve as food for .

Human Relevance

Larvae (hellgrammites) valued as excellent fish . may startle humans due to large size and appearance; females can deliver painful defensive bite. Attracted to porch lights, occasionally encountered by humans near waterways.

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