Dytiscus dauricus    



habitat
Permanent ponds in forested regions (Larson et al. 2000). Associated with aquatic macrophytes.

seasonality
Adults emerge from July to September.

identification
Large (29.7 to 40.0mm), broadly elongate (Larson et al. 2000). Black - some with green appearance. Basal antennal segments yellow, darker and reddish terminal segments. All pronotal margins bordered with yellow. Females with reddish or brown-black striae and black ridges. Reddish yellow or reddish ventral surface, except red metacoxa, medially brown-black metasternum, and black anterior and posterior margins of abdominal sterna. Brown-black or black sternal basolateral maculation - progressively smaller to posterior. Yellow or reddish legs.

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.

conservation
No special status (IUCN 2002).

diet info
Predatory - active swimmers (Larson et al. 2000). Invertebrate and fish larvae prey. Records of larval cannibalism and predation on salamanders and snakes in Arizona (Holomuzki 1985, 1986).

range
Holarctic (Larson et al. 2000). This species is recorded from most of Alberta. Wide distribution through Boreal zones and Western Cordillera. Aleutian Islands, Alaska to Newfoundland, as far south as California and Arizona. Found at sea level in northern parts of range to increasingly higher elevations in southern part of range. One record from northwestern China; records from Soviet Union, east of Lake Baikal.

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

quick link
http://entomology.museums.ualberta.ca/searching_species_details.php?s=4258

 

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