Description: A small (4-5mm) brown-black Badister living in luxuriant vegetation, litter etc at the margins of rich lakes and fens. Very uncommon. Part of a complex of difficult species. Requires dissection to distinguish from B. peltatus.

NI account: Added to the Irish List by Owen (1994) from Lough Gash, Clare. Since found at Knockaderry Reservoir, Ballyshunnock Reservoir and Ballyscanlan Lough in Co. Waterford where it appears common (Anderson & McCormack, 2009). Also from a marsh at Barrigone, Co. Limerick (Alan Brown). Restricted to the extreme south-east of England within Britain (Luff, 1998) but apparently more widespread in Ireland.

Ecology: At Lough Gash the species occurred under an algal mat on the open shoreline of a turlough. In other parts of its range it can occur with B. peltatus which in Ireland occupies silty and richly vegetated, often wooded, shores of lakes and turloughs on limestone.

Distribution: A European temperate species (73) found from southern Scandinavia to the Iberian Peninsula and east into Asia Minor.

Similar Species: Badister peltatus: distinguishable with certainty only on the male genitalia; elytral striae more incised, intervals slightly convex B. dilatatus: distinguishable with certainty only on the male genitalia; elytral striae more incised; hind angles of pronotum more rounded, oblique lateral area slightly arcuate (Fig. 90)

Key Identification Features:

• Small, elytra iridescent and with fine, impunctate striae
• Mandibles asymmetric, left mandible having a large dorsal tubercle and notch (Fig. 104), as dilatatus
• Second segment of antennae very short
• Colour dark with only elytral margins slightly paler
• Hind angles of pronotum less rounded, base inside these oblique (Fig. 90), as peltatus
• Elytral striae very fine, intervals flat

Distribution Map from NBN: Badister collaris at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Badister collaris at iNaturalist World Species Observations database.

GBIF data for Badister collaris | Classification: Insecta, Coleoptera, Carabidae, Badister

Thumbnails for genus Badister