Oiceoptoma inaequale

Ridged Carrion Beetle
Oiceoptoma inaequale

 

Ridged Carrion Beetle Oiceoptoma inaequale mating on dead garter snake, Arpil 08, 2010. Wheatley, Ontario.
Ridged Carrion Beetle Oiceoptoma inaequale mating on dead garter snake, Arpil 08, 2010. Wheatley, Ontario.

Identification:
Head: Dull black, smooth (no punctures); covered with a very fine black hair, pile-like. Long, erect hairs on hind eye margin.
Antenna: Black, clubbed.
Thorax (Pronotum): Dull black, covered with a very fine black hair, pile-like. Base much wider than head, end as wide as wings with uneven border. Central area has series of random, broken, raised, rounded ridges.

Ridged Carrion Beetle Oiceoptoma inaequale mating on dead garter snake, Arpil 08, 2010. Wheatley, Ontario.
Ridged Carrion Beetle Oiceoptoma inaequale mating on dead garter snake, Arpil 08, 2010. Wheatley, Ontario.

Wings (Elytra): Dull black, flat with 3 longitudinal, slightly raised lines on each wing. Male wing tips short, more rounded, abdomen tip usually visible. Female wings longer with sharper pointed tips. Underside outer edge of wings thickened, dark metallic blue.
Legs: Black, long and thin.
Abdomen: Dull black.

Size: 13 to 15 mm.

Habitat: Deciduous forests and forest edges.

Food: Prefers larger carcasses of deer, squirrel, muskrat; snake in Essex County, Ontario.

Flight Time: April to July.

Ridged Carrion Beetle Oiceoptoma inaequale mating on dead garter snake, Arpil 08, 2010. Wheatley, Ontario.
Ridged Carrion Beetle Oiceoptoma inaequale mating on dead garter snake, Arpil 08, 2010. Wheatley, Ontario.

Life Cycle: Adults find dead animals and mate on the carrion. Females lay eggs near carrion. New adults appear in July and overwinter. One generation per year. Day fliers.

Comments: Essex County – Ojibway Prairies. Southern Ontario to tip of Georgian Bay, east to Quebec.

Synonyms: Fabricius 1781
Silpha inaequale, Oiceoptoma inaequale

References:
Fauna Boreali-americana, 1837, Pt. 4 by Kirby, pg. 102.
The Canadian Entomologist, 1871, Vol. 03: Insect Northern British America by Saunders, pg. 137.
Agriculture Canada Research Branch, 1985: Insects and Arachnids of Canada, Pt. 13: Carrion Beetles by Anderson & Peck, pp. 36 to 38.
Colorado University Museum of Natural History, 2016: Key to Carrion Beetles of Colorado by Monk, et al. [on line .pdf]

Types: Unknown

 

 

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