Dytiscus cordieri    

Permanent and temporary ponds (Larson et al. 2000). Associated with aquatic macrophytes.

Adults emerge from March to October.

Large (26.3 to 32.5 mm), elongate body (Larson et al. 2000). Brown-black to black - some with green appearance. Pronotal margins and elytra broadly yellow. Large medial chevron on head. Basal antennal segments yellow, terminal segments reddish. Most of ventral surface yellow, except darker and reddish abdominal sterna, metacoxa and medial metasternum. Elongate brown-black spot along posterior margin of metacoxa. Yellow legs with reddish tibia and tarsi.

life history
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, although naturally occur in low population densities throughout range (IUCN 2002,

diet info
Predatory - active swimmers (Larson et al. 2000). Invertebrate and fish larvae prey.

In Alberta this species has been recorded from most regions. This species ranges from British Columbia to New Brunswick, and as far south as northern California, Colorado and North Carolina (Larson et al. 2000).

species page authorEdgar, M.2003 
species page editorShpeley, D.2004 

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