Platysoma coarctatum

Members of the genus Platysoma can be recognized by their flattened, oval body form and shortened elytra that leave the tip of the abdomen exposed. The genus is distinguished from other histerid genera by its overall body shape and antennal structure. Specific identification of P. coarctatum requires examination of detailed morphological features including pronotal and elytral sculpture.

Inhabits spaces beneath bark of dead or dying trees, particularly in coniferous forests. Has been observed in association with logging operations and freshly cut pine logs.

North America. Canada: Alberta, British Columbia, Manitoba, New Brunswick, Northwest Territories, Nova Scotia, Ontario, Prince Edward Island, Quebec, Saskatchewan. United States: widespread, recorded from Connecticut, Florida, Massachusetts, Maryland, Maine, New Hampshire, Oklahoma, Rhode Island, and other states.

Predator. Preys on larvae of flies and beetles found under bark.

Active predator in subcortical habitats. Hunts prey under bark of dead wood.

Predator of other insects in forest ecosystems. Contributes to biological control of populations of fly and beetle larvae in dead and dying wood.

Encounters may occur in logging operations and forestry contexts. No significant economic impact documented; likely beneficial as a natural control agent of potential forest pests.

• Other Platysoma speciesShare flattened body form and bark-dwelling habits; require detailed examination for separation
• Other Histeridae generaSimilar size and predatory habits under bark; distinguished by body shape, elytral coverage, and antennal club structure

• predator
• bark-dwelling
• forest
• coniferous
• North America

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life
• Bug Eric: Beetle Bonanza