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Species Page - Dytiscus harrisii
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scientific name    Dytiscus harrisii    

Shallow, warm permanent ponds, sedge marshes, beaver ponds and slow streams.

Adults emerge from July to September.

Large (32.4 to 39.0mm), broad body (Larson et al. 2000). Dark brown to black - some with green appearance. Small chevron between eyes. Ventral surface of head yellow. Prosternum pale at lateral margins, brown-black medially. All margins of pronotum broadly yellow. Middle and hind legs brown-black with reddish basal portions, forelegs reddish anteriorly and brown-black posteriorly.

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 (IUCN 2002)

diet info
Predatory - active swimmers (Larson et al. 2000). Invertebrate and fish larvae prey. Records of larval preference for caddisfly (Trichoptera) prey (LeClair et al. 1986).

In Alberta, recorded in the northern, central and southerwestern regions. This species ranges from Alaska to Newfoundland, as far south as Washington, Nebraska and Pennsylvania (Larson et al. 2000). Generally rare in western parts of range, most abundant in Great Lakes region.

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Related Species Info
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References (4)
Specimen Info
There are 2 specimens of this species in the online database
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Adult Seasonal Distributioncreate a collection histogram with specimens
Specimen List (2)


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