Anisodactylus merula
Anisodactylus merula
Size: 10.3-13.9mm
Seasonality: March-September
Distribution; scattered across the USA
Information: n/a
Description: body: elongate-ovate, broad, flattish. Body colouration of mature adults dark black-grey, semi-glossy to matte. No dorsal pubescence. Head squarish; surface of the head with shallow wrinkles; two dimples may be found on the frons; suture between the clypeus and the frons is evident. Clypeus very short, rough, with yellow front-facing margins. Labrum rectangular, glossy black, with yellow-orange margins, anterior angles rounded, and anterior margin with a shallow inward curve. Mandibles short, but very thick, dark reddish to black, mandible tips somewhat pointed, designed for crushing seeds as well as small arthropods. Palpi black, with pale tips; antennae thin, short, the scapus and pedicel should be pale yellow, rest of antennae dark. Eyes rather far apart due to broad head; eyes buldging laterally, though not excessively. Pronotum shaped like a half-oval, flattish; disk mostly smooth, very faintly wrinkled--wrinkles sporadic--with very faint dimples on either side of the nearly-absent lower median bulge. Anterior margin concave; front angles rounded-acute; lateral margins rounded; hind angles rounded-acute, nearly squared; pronotal base twice the width of the head; basal margin weakly curved inward; pronotal margins should all be thinly beaded. Pronotal base same width as humeral shoulders. Scutellum partially exposed. 8 well-defined striae per elytron, intervals weakly elevated, otherwise smooth. Intervals 3 and 5 should each have between 4 and 5 setigerous pits on the apical half of the elytron. Laterobasal ridges entire, with small humeral tooth present; parascutellar pores present, very small. Humeral shoulders squarish; lateral margins along the basal half of the elytra nearly parallel, then steadily slope/round toward the apex. Ventral colouration semi-glossy black. Legs black.