Platydracus sepulchralis

Distinguished from other large rove beetles by a combination of size, body proportions, and presumably genitalic and other microscopic characters. Separated from the similar-looking Platydracus maculosus (brown rove beetle) by geographic range—P. sepulchralis occurs in western North America while P. maculosus is primarily eastern. Distinguished from other Platydracus species by subtle morphological characters requiring examination of setal patterns and other fine details.

Found in association with decomposing organic matter. Based on related species in the genus, likely occurs in forested and woodland habitats, particularly in moist microhabitats such as under stones, boards, leaf litter, and in association with fungi or decaying wood.

Western North America: documented from Arizona, California, Colorado, New Mexico, and Texas in the United States, plus Mexico.

Presumed predatory, feeding on other insects and invertebrates. As with other large Platydracus species, likely preys on soft-bodied insects including other beetles found in the same microhabitats.

Active predator. When disturbed, may raise abdomen in a scorpion-like fashion and open mandibles as a defensive display—behavior observed in related Platydracus species.

Predator in decomposer food webs, contributing to regulation of populations of other insects in decaying organic matter habitats.

Generally beneficial as a predator of other insects; no known negative impacts. Occasionally encountered by entomologists and naturalists turning logs or debris.

• Platydracus maculosusSimilar large size and general appearance, but P. maculosus is primarily eastern in distribution while P. sepulchralis is western; subtle morphological differences in setal patterns and other fine characters separate them.
• Tasgius winkleriSimilar large rove beetle appearance, but T. winkleri is a European introduction to North America with different distribution and subtle structural differences; requires examination of tarsal and other characters for definitive separation.

• rove beetle
• Staphylinidae
• predator
• decomposer habitat
• western North America

• BugGuide
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• iNaturalist taxon
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