There are 40 currently recognized species, known from all continents except Antarctica . " Placonotus " species are small ( ~ 2mm ), elongate, flattened beetles, characterized by long filiform antennae, presence of a frontoclypeal suture, open anterior coxal cavities, and broadly rounded intercoxal process of abdominal ventrite III . Males have the 8th abdominal segment modified to form claspers used during mating.
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