Conservation Status
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No special status (IUCN 2002).
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Cyclicity
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Adult population peak in late spring, declining into fall (Aiken and Wilkinson 1985).
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Distribution
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In Alberta this species has been recorded from most regions. This species ranges from Alaska to Newfoundland; known from all provinces and states along the USA-Canada border, as far south as Colorado (Larson et al. 2000, Partridge and Lauff 1999).
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General Description
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"Small to medium size (22.6 to 32.0 mm), elongate body (Larson et al. 2000). Brown-black to black - many with green appearance. Basal segments of antennae yellow, terminal segments darker. All pronotal margins bordered with yellow. Lateral border of elytra yellow, not reaching apex. Females with yellow striae and dark ridges. Yellow ventral surface, except brown-black metasternum, reddish metacoxa, margins of abdominal sterna narrowly black and thoracic sclerites with narrowly black margins. Dark basolateral marking on second and third sterna. Yellow or reddish legs.
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Habitat
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Permanent lakes, ponds and bogs (Larson et al. 2000). Associated with aquatic macrophytes.
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Life Cycle
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Overwinter as adults in permanent waters (Larson et al. 2000). Early spring mating (Aiken 1992). Univoltine (Aiken and Wilkinson 1985). Strong swimmers, hind legs move together while swimming. Adults attracted to lights.
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Trophic Strategy
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Predatory - active swimmers. Invertebrate and fish larvae prey. Suggestion that diet primarily composed of dead animal matter (Aiken and Leggett 1984). Predation rates highest at night (Aiken 1986).
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