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Passalidae (subclass Pterygota, order Coleoptera) Family of large shiny, flattened beetles, 20–60 mm long, which have an elongate, parallel-sided body, which is usually black or brown. The antennae are curved and comb-like. They are found under bark in tropical forests. They regurgitate chewed wood to feed larvae. It is claimed that adults of both sexes tend larvae to maturity. Larvae are curved and fleshy, with much reduced back legs. Adults and larvae stridulate. There are 490 species, none occurring in Europe.

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