Aggerbille Legalov et Perkovsky, 2024

Genus Aggerbille Legalov et Perkovsky , gen. nov.

https://zoobank.org/ urn:lsid:zoobank.org:act:5845000C-56EC-4BCB-9FC9-53BFD948E944

Type species. Aggerbille havai Legalov et Perkovsky , sp. nov.

Etymology. From the Agger locality and Danish ‘bille’ beetle.

Diagnosis. Body small, oblong-oval, covered with dark long decumbent setae; head distinctly narrower than greatest pronotal width; eyes coarsely faceted; antennae slightly reaching hind angles of pronotum; antennomeres 9 and 10 more than two times as long as wide, antennal club three-segmented; pronotum widest at base, with distinct lateral carinae; posterior pronotal angles obtuse, not embracing elytral humeri; metacoxal length less than half its width; elytra without distinct puncture rows; mesoventrite flattened; tarsal formula 3-4-4.

Comparison. The new genus differs from the Western Palaearctic genus Triphyllus Dejean, 1821 by its smaller body size, antennomeres 9 and 10 longer than wide, pronotum more strongly narrowed toward the apex, and shorter elytra; from the North American genus Neotriphyllus Lawrence, Escalona, Leschen & Ślipiński, 2014 in the smaller body size, its pronotum more strongly narrowed towards the apex, its mesoventrite flattened, covered with dark and long decumbent setae. It is distinguished from the genus Litargus by the posterior pronotal angles obtuse, not embracing the elytral humeri. The new genus differs from the Eocene Crowsonium by its pronotum being broadest at the base, and by its distinct antennal club consisting of three segments.