8; see text Opselater is a genus of click beetle (family Elateridae).

Luminous spots small, lateral, flat and visible also in the proepisternum.

Male genitalia: median lobe very enlarged at the middle, with or without minute cuticular scales.

Female genitalia: bursa copulatrix more or less spiraled, with long spines; accessory glands well developed; spermatheca well developed and median oviduct with sclerotized plates.

[1] Opselater is mainly distributed in the Atlantic forest and some species are apparently disjunct.