Introduction. The name of each listed species is followed by up to five sources that report the species as occurring in Michigan. Sources in all upper-case letters refer to specific insect collections: MSU-ARC refers to material held by the Michigan State University Arthropod Research Collection (data provided by G. Parsons). All others refer to collection data extracted from the Symbiota Collections of Arthropods Network (SCAN) database online at https://scan-bugs.org/. See the Methods page for a list of abbreviations and associated collections.

Species names preceded by a single '?' are considered probable (for occurring in Michigan) but uncertain records. Those preceded by '??' are considered possible but unlikely to occur in Michigan. Species that are fully accepted as having valid Michigan records are unmarked. Species reported in the literature that we consider to be erroneous Michigan records are in a separate list following the others.

STAPHYLINIDAE - OMALIINAE

1 subfamily, 4 tribes, 19 genera, 35 species

Tribe Anthophagini

Acidota crenata (Fabricius, 1792): Herman (2001), Andrews (1916), Hubbard and Schwarz (1878), Campbell (1982b), MSU-ARC

Acidota subcarinata Erichson, 1840: Herman (2001), Campbell (1982b), Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

Arpedium angulare Fauvel, 1878: Herman (2001)

Arpedium cribratum Fauvel, 1878: Herman (2001), MSU-ARC

Arpedium schwarzi Fauvel, 1878: Herman (2001), Campbell (1984b), Evans (2014), Downie and Arnett (1996)

Brathinus nitidus LeConte, 1852: Herman (2001), Frank et al. (1987), Hubbard and Schwarz (1878), Downie and Arnett (1996)

Brathinus varicornis LeConte, 1852: Herman (2001), Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

Eucnecosum brunnescens (Sahlberg, 1871): Herman (2001), Campbell (1984b), Downie and Arnett (1996)

Eucnecosum tenue (LeConte, 1863): Herman (2001), Campbell (1984b), Downie and Arnett (1996)

Geodromicus brunneus (Say, 1823): Bright (2015), Wolcott (1909), Hatch (1925), Hubbard and Schwarz (1878), MSU-ARC

Geodromicus strictus Fauvel, 1889: Herman (2001), Bright (2015), Leng (1920), Downie and Arnett (1996), MSU-ARC

Lesteva pallipes LeConte, 1863: Hubbard and Schwarz (1878), Ruesink and Parsons (2024), MSU-ARC

Olophrum consimile (Gyllenhal, 1810): Herman (2001), Campbell (1983), Hubbard and Schwarz (1878), MSU-ARC

Olophrum obtectum Erichson, 1840: Herman (2001), Andrews (1923), Hubbard and Schwarz (1878), MSU-ARC

Olophrum rotundicolle (C.R. Sahlberg, 1830): Campbell (1983), Hubbard and Schwarz (1878), MSU-ARC

Pelecomalium laevicolle(LeConte, 1866): Ruesink and Parsons (2024), MSU-ARC

??Porrhodites fenestralis (Zetterstedt, 1828): Leng (1920); a northern sp. that may be in MI, record needs confirmation

Trigonodemus striatus LeConte, 1863: Andrews (1923), Ruesink and Parsons (2024), MSU-ARC

Tribe Coryphiini

Ephelinus notatus (LeConte, 1863): Herman (2001), Campbell (1978b), Hubbard and Schwarz (1878)

Tribe Eusphalerini

Eusphalerum convexum (Fauvel, 1878): Ruesink and Parsons (2024), MSU-ARC

Eusphalerum orientale (Bernhauer, 1912): Haack and Ruesink (2020), Zanetti (2014), MSU-ARC

Eusphalerum pothos (Mannerheim, 1843): Zanetti (2014), MSU-ARC

Tribe Omaliini

Acrolocha diffusa (Fauvel, 1878): Herman (2001), Downie and Arnett (1996)

?Acrolocha fracta (Fauvel, 1878): Downie and Arnett (1996); Herman (2001) has this in Pennsylvana & Missouri, but no closer

Hapalaraea hamata (Fauvel, 1878): Herman (2001), Leng (1920), Downie and Arnett (1996)

Omalium foraminosum Mäklin, 1852: Herman (2001)

Omalium quadripenne Casey, 1893: Herman (2001)

Omalium repandum Erichson, 1840: Ruesink and Parsons (2024), MSU-ARC

Omalium rivulare (Paykull, 1789): Ruesink and Parsons (2024), MSU-ARC

Phloeostiba lapponicus (Zetterstedt, 1838): Haack and Ruesink (2020), Hubbard and Schwarz (1878)

Phyllodrepa floralis (Paykull, 1789): Herman (2001), MSU-ARC

Phyllodrepa humerosa (Fauvel, 1878): Herman (2001), DiGirolomo (2021), Downie and Arnett (1996), Leng (1920), Townsend (1889)

?Pycnoglypta aptera Campbell, 1983: FMNH:FMNHINS; Mackinac

Pycnoglypta campbelli Gusarov, 1995: Shavrin (2016), Andrews (1923), MSU-ARC

Xylodromus concinnus (Marsham, 1802): Herman (2001), Downie and Arnett (1996), Leng (1920)

The following species was also reported from Michigan, but we consider it to be adventive, a misidentification or other error:

Tribe Eusphalerini

Eusphalerum subangulatum (Casey, 1893): Downie and Arnett (1996); known only from California (Zanetti, 2014)

This family list was last updated: April 7, 2023