Eucnecosum
Reitter, 1909
Species Guides
2Eucnecosum is a of rove beetles (Staphylinidae: Omaliinae) established by Reitter in 1909. The genus comprises three valid holarctic : E. brachypterum, E. tenue, and E. brunnescens, all transferred from the genus Arpedium. These beetles occur in both Europe and North America, with E. tenue having been previously described under multiple synonyms including E. meybohmi.
Pronunciation
How to pronounce Eucnecosum: /juːkˈnɛkoʊsəm/
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Identification
of Eucnecosum can be distinguished from the related Arpedium using the morphological characters detailed in taxonomic keys provided by revision studies. The genus is characterized by features that separate it from Arpedium, though specific diagnostic traits require examination of detailed morphological descriptions and illustrations in primary taxonomic literature.
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Distribution
Holarctic. occur in Europe and North America. E. brachypterum, E. tenue, and E. brunnescens are transcontinental species with distributions spanning both continents.
Similar Taxa
- ArpediumHistorically confused with Eucnecosum; E. brachypterum, E. tenue, and E. brunnescens were transferred from Arpedium to Eucnecosum based on morphological differences confirmed by Lohse and subsequent revision work.
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Taxonomic History
The generic placement of Eucnecosum has been revised multiple times. Lohse transferred brachypterum, tenue, and brunnescens from Arpedium to Eucnecosum, a transfer subsequently confirmed in North American revision work. The synonym E. meybohmi Lohse, 1963 was established for E. tenue.
Species Composition
Three are currently recognized: E. brachypterum (Gravenhorst), E. tenue (LeConte), and E. brunnescens (J. Sahlberg). All are holarctic in distribution.