Melanastus
Casey, 1907
Melanastus is a of darkling beetles in the Tenebrionidae, established by Thomas L. Casey in 1907. The genus contains relatively few described and is poorly represented in collections and literature. Members are small to medium-sized beetles with the general body plan typical of many Tenebrionidae. The genus appears to be restricted to North America, though precise distributions remain unclear due to limited sampling and taxonomic study.
Pronunciation
How to pronounce Melanastus: /mɛlˈænæstəs/
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Identification
Distinguishing Melanastus from related tenebrionid requires examination of male genitalia and subtle characters of the pronotum and elytral surface sculpturing. The genus lacks the pronounced lateral pronotal margins seen in some related genera. Antennal structure, particularly the number and form of antennomeres in the club, may provide diagnostic features, though specific characters require verification.
Distribution
North America; specific range boundaries undefined due to limited records.
Similar Taxa
- TenebrioBoth are Tenebrionidae with superficially similar dark coloration and body form, but Tenebrio is larger, more robust, and has a distribution including stored product .
- EleodesEleodes shares the darkling beetle habitus but is immediately distinguished by its larger size, more elongate body, and the defensive posture of elevating the when disturbed—a not recorded in Melanastus.