Overview

Comprehensive Description

General Description

Large (27.5 to 34.0 mm), elongate body (Larson et al. 2000). Brown to black - some with green appearance. Ring of yellow around inner margin of eye. All pronotal margins bordered with yellow. Lateral margin of elytra yellow and narrowing to apex. Yellow or reddish ventral surface, expect thoracic sclerites margins narrowly brown-black and metasternum medially and metacoxa dark red. Pale abdominal sterna, with basal margins of first through third sterna narrowly brown-black. Yellow or yellow-reddish legs, brown-black dorsal surface of tibia.
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Distribution

National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

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Holarctic (Larson et al. 2000). This species is recorded from most of Alberta. This species ranges from Alaska to Maine, and as far south as Washington, Iowa and North Carolina. Also known from Great Britain to Kamchatka, records from peninsular Italy (Nardi and Maltzeff 2001).
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Ecology

Habitat

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

Predatory - active swimmers (Larson et al. 2000). Invertebrate and fish larvae prey. Larvae are predators of mayfly (Ephemeroptera) nymphs, isopods (Isopoda) and caddisflies (Trichoptera) (Johansson and Nilsson 1992).
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Life History and Behavior

Cyclicity

All teneral specimens from late July.
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Life Cycle

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.
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Dytiscus circumcinctus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 2
Specimens with Barcodes: 7
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: GNR - Not Yet Ranked

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No special status (IUCN 2002).
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