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The cryptic slime mold beetles,   Sphindidae  , are a moderately diverse cucujoid beetle family, whose members are obligately tied to slime molds throughout their life. The fossil record of sphindid beetles is sparse; stem-sphindids and crown-group members of uncertain systematic placement have been reported from Cretaceous ambers. Here we review the Mesozoic fossil record of   Sphindidae   and report a new sphindid genus and species,    Trematosphindus   newtoni    gen. et sp. nov. , from Albian/Cenomanian amber from northern Myanmar ( ca.  99 Ma).    Trematosphindus    is set apart from all other sphindids by the presence of distinct lateral cavities on the anterior pronotal angles. Our phylogenetic analysis identifies    Trematosphindus    as an early-diverging genus within   Sphindidae  , sister to the remainder of the family except    Protosphindus   , or    Protosphindus    and    Odontosphindus   . The new fossils provide evidence that basal crown slime mold beetles begun to diversify by the mid-Cretaceous, providing a valuable calibration point for understanding timescale of sphindid co-evolution with slime molds.

New mid-Cretaceous cryptic slime mold beetles and the early evolution of Sphindidae ( Coleoptera : Cucujoidea )