Eustilicus tristis
(Melsheimer, 1844)
Eustilicus tristis is a of rove beetle in the Staphylinidae, Paederinae. The species was described by Frederick Ernst Melsheimer in 1844. It belongs to a of small, slender rove beetles found primarily in North America. The specific epithet 'tristis' (Latin for 'sad' or 'dull') likely refers to its coloration.
Pronunciation
How to pronounce Eustilicus tristis: /juˈstɪlɪkʊs ˈtrɪstɪs/
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Identification
As a member of Eustilicus, this likely exhibits the -characteristic slender body form and relatively short typical of rove beetles. Definitive identification to species level requires examination of male genitalia and other microscopic characters. The species can be distinguished from by aedeagal and subtle differences in punctation and coloration patterns, though these characters are not well documented in accessible literature.
Distribution
Recorded from the eastern and central United States: Arkansas, District of Columbia, Kentucky, Missouri, New Jersey, New York, Ohio, Oklahoma, Pennsylvania, South Carolina, Texas, and Virginia. Records from Mexico appear to be erroneous.
Similar Taxa
- Other Eustilicus speciesCongeneric share the slender body form and short ; accurate separation requires dissection and examination of male genitalia and other fine morphological details.
- Other Paederinae genera (e.g., Stilicinus, Lathrobium)Members of this share general body plan; Eustilicus is distinguished by specific combinations of antennal structure, pronotal shape, and male genitalia.
More Details
Taxonomic placement
Eustilicus tristis is classified in the tribe Lathrobiini, subtribe Stilicina, reflecting its close relationship to other small, ground-dwelling rove beetles in this group.