Isoplastus
Horn, 1880
Species Guides
1Isoplastus is a of small carrion beetles in the Leiodidae, first described by Horn in 1880. The genus belongs to the tribe Leiodini within the Leiodinae. Members of this genus are part of the diverse rove beetle (Staphyliniformia), though they are not rove beetles proper. Very few have been described, and the genus remains poorly known biologically.
Pronunciation
How to pronounce Isoplastus: /ˌiːsoʊˈplæstəs/
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Identification
Isoplastus can be distinguished from other Leiodini by the combination of: pronotum with distinct lateral margins; completely covering the ; and with a weakly to moderately clubbed segment. The genus is most similar to Leiodes but differs in having the prosternal process not expanded posteriorly and the mesosternal carina less elevated. Examination of male genitalia is required for definitive identification.
Distribution
North America; primarily recorded from the United States. Specific state records include California and Arizona, though precise range limits remain undocumented.
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Taxonomic note
Isoplastus is one of several small leiodid erected by Horn based on subtle differences in thoracic structure. The genus has received little modern taxonomic attention, and its monophyly and relationship to Leiodes warrant reevaluation using molecular data.
Collection rarity
Specimens are rarely encountered in collections, likely reflecting genuine rarity rather than collection against small carrion beetles. Most records derive from pitfall trapping in arid and semi-arid .