Abstract
Ptiliidae is a group of distinctly miniaturized staphylinoid beetles with a scarce fossil record. Here, we report a new ptiliid genus and species, Crenossidium slipinskii Li, Newton and Cai gen. et sp. nov., from mid-Cretaceous amber from northern Myanmar. Crenossidium can be attributed to the subfamily Nossidiinae based on the hind wing morphology, which has also been confirmed through phylogenetic analyses. Crenossidium differs from other extant nossidiine genera in the combination of the wide apical maxillary palpomeres, posteriorly widest pronotal disk, (almost) contiguous procoxae, fewer setae along wing margin, and multidentate pygidium.urn:lsid:zoobank.org:pub:8038D763-6856-4AC5-972C-E20D636137EE.
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