Eusphalerum
Kraatz, 1857
Species Guides
9Eusphalerum is a of ocellate rove beetles in the Staphylinidae, first described by Kraatz in 1857. The genus contains at least 130 described and is classified within the Omaliinae and tribe Eusphalerini. Members of this genus are characterized by the presence of ocelli, simple distinct from the . The genus has been documented across parts of Europe and North America.
Pronunciation
How to pronounce Eusphalerum: //juːˈsfælɛrəm//
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Identification
Eusphalerum possess ocelli—small, simple located on the surface of the between the . This ocellate condition distinguishes them from most other rove beetles, which lack ocelli. As members of the Omaliinae, they exhibit the general staphylinid body plan with short exposing most of the . Specific species-level identification requires examination of genitalic structures and other fine morphological details.
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Distribution
Recorded from Denmark, Norway, Sweden, and the United States (including Vermont). The has a transatlantic distribution spanning parts of northern Europe and eastern North America.
Similar Taxa
- Other Omaliinae generaNon-Eusphalerum Omaliinae lack ocelli; the presence of ocelli is the primary diagnostic feature separating Eusphalerum from related within the same .
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Taxonomic history
The was established by Kraatz in 1857. It is the type genus of the tribe Eusphalerini within the Omaliinae. The large number of described (130+) suggests either genuine diversity or potential future taxonomic revision.