common name     Predaeceous Diving Beetle

Permanent standing water (Larson et al. 2000), with aquatic macrophytes; springs and saline water.

Overwinter as adults (Larson et al. 2000). Late fall or early spring mating. Adults emerge from Ma

Large (22 to 40mm), elongate and ovular body (Borror and White 1970, Larson et al. 2000). Flattened hind legs with swimming hairs. One or two claws on hind tarsi. Threadlike antennae. Visible scutellum. Reddish, brown or black in colour. Pronotal margins variably yellow (used in species identification). Sexually dimorphic.
Royal Alberta Museum page

life history
Univoltine in temperate regions (Aiken and Wilkinson 1985). Life span up to 18 months. Strong swimmers, hind legs move together while swimming. Adults attracted to lights.

One species on IUCN red list, D. latissimus (IUCN 2002). All other species with no special status.

diet info
Predaceous - typically invertebrate and fish larvae prey (Larson et al. 2000). Records of larval salamander and snake prey, feeding on dead animal matter and cannibalism (Holomuzki 1985, 1986; Aiken and Leggett 1984). Larvae referred to as "water tigers."

Holarctic (Larson et al. 2000).

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

quick link


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