|scientific name Dytiscus marginicollis |
common name Giant green water beetle
Semi-permanent, saline ponds (Larson et al. 2000). Also in fresh water ponds.
Adults emerge from May to August.
Medium size (26.7 to 33.0 mm), elongate body (Larson et al. 2000). Reddish to black - some with metallic green appearance. All margins of pronotum and lateral margins of elytra broadly margined with yellow. Large medial chevron on head. Basal segments of antennae yellow, terminal segments reddish. All pronotal margins broadly yellow - basal margin narrow laterally and broadly expanded medially. Lateral margins of elytra yellow, narrowed and discontinuous at apex. Fore- and middle legs yellow to pale red.
Overwinter as adults in permanent waters (Larson et al. 2000). Late fall or early spring mating. Univoltine (Aiken and Wilkinson 1985). Strong swimmers, hind legs move together while swimming. Adults attracted to lights.
No special status (IUCN 2002).
Predatory - active swimmers (Larson et al. 2000). Invertebrate and fish larvae prey.
In Alberta this species is recorded from the southern region. This species ranges from British Columbia to Manitoba (Larson et al. 2000). The southern-most records are from Durango State, Mexico.
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