Abacetini is a group of probably more than 500 species for which there is little modern synthesis or taxonomic revision. These beetles are distributed throughout Africa and into southern Europe, across tropical and subtropical Asia and into the Pacific as far as northern Australia.
A broad set of taxa have been informally associated with Abacetus based on the combination of the lack of the angular base of stria 1; a single pair of deeply impressed, linear basal impressions of the pronotum; a single or no dorsal puncture on the third elytral interval; the basal elytral puncture at or near stria two and males with symmetrically expanded protarsomeres. Additionally, nearly all of these taxa have deeply impressed, elongate frontal impressions on the head; sinuate anterior coxal sulcus and coiled spermatheca. The most obvious characteristic and likely synapomorphy for a possibly derived clade (Abacetini s.str.) is the eccentrically inserted second antennomere and, perhaps, the strongly transverse mentum. The mentum form, however, is somewhat variable. DNA sequence data also supports this clade based on a selected set of exemplars and several gene loci (K. Will unpublished).
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