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.
GYRINIDAE
1 subfamily, 2 tribes, 2 genera, 29 species
Subfamily Gyrininae
Tribe Dineutini
Dineutus assimilis (Kirby, 1837): Ferkinhoff and Gundersen (1983), Bright (2015), Gustafson and Miller (2015), Hubbard and Schwarz (1878), MSU-ARC
Dineutus discolor Aubé, 1838: Ferkinhoff and Gundersen (1983), Bright (2015), Gustafson and Miller (2015), Hubbard and Schwarz (1878), MSU-ARC
Dineutus emarginatus (Say, 1823): Gustafson and Miller (2015), Bright (2015), Wood (1962), Andrews (1916), Hubbard and Schwarz (1878)
Dineutus hornii Roberts, 1895: Gustafson and Miller (2015), Ferkinhoff and Gundersen (1983), Bright (2015), Andrews (1916), MSU-ARC
Dineutus nigrior Roberts, 1895: Gustafson and Miller (2015), Ferkinhoff and Gundersen (1983), Bright (2015), Andrews (1923), MSU-ARC
Tribe Gyrinini
Gyrinus aeneolus LeConte, 1868: Oygur and Wolfe (1991), Ferkinhoff and Gundersen (1983), Bright (2015), Hubbard and Schwarz (1878), Downie and Arnett (1996)
Gyrinus affinis Aubé, 1838: Oygur and Wolfe (1991), Ferkinhoff and Gundersen (1983), Bright (2015), Andrews (1923), Downie and Arnett (1996)
Gyrinus analis Say, 1825: Oygur and Wolfe (1991), Bright (2015), Hubbard and Schwarz (1878)
Gyrinus aquiris LeConte, 1868: Oygur and Wolfe (1991), Ferkinhoff and Gundersen (1983), Bright (2015), Hubbard and Schwarz (1878)
Gyrinus bifarius Fall, 1922: Oygur and Wolfe (1991), Bright (2015), Downie and Arnett (1996), MSU-ARC
Gyrinus borealis Aubé, 1838: Oygur and Wolfe (1991), Oygur (1988), Bright (2015)
Gyrinus cavatus Atton, 1990: MSU-ARC; Bright (2015) website entry for G. minutus says "this may be G. cavatus Atton, 1990 - check article in Can Ent. that O & W were unaware of."
Gyrinus confinis LeConte, 1868: Oygur and Wolfe (1991), Ferkinhoff and Gundersen (1983), Bright (2015), Hubbard and Schwarz (1878), MSU-ARC
Gyrinus dichrous LeConte, 1868: Oygur and Wolfe (1991), Ferkinhoff and Gundersen (1983), Bright (2015), Hubbard and Schwarz (1878)
Gyrinus fraternus Couper, 1865: Merritt et al. (2002), Bright (2015), Hubbard and Schwarz (1878)
Gyrinus gehringi Chamberlain, 1929: Oygur and Wolfe (1991), Ferkinhoff and Gundersen (1983), Bright (2015)
Gyrinus gibber LeConte, 1868: Oygur and Wolfe (1991), Ferkinhoff and Gundersen (1983), Bright (2015), MSU-ARC
Gyrinus impressicollis Kirby, 1837: Oygur and Wolfe (1991), Bright (2015)
Gyrinus latilimbus Fall, 1922: Oygur and Wolfe (1991), Ferkinhoff and Gundersen (1983), Bright (2015), MSU-ARC
Gyrinus lecontei Fall, 1922: Oygur and Wolfe (1991), Bright (2015), Hatch (1924)
Gyrinus maculiventris LeConte, 1868: Oygur and Wolfe (1991), Ferkinhoff and Gundersen (1983), Bright (2015), Hubbard and Schwarz (1878), MSU-ARC
Gyrinus marginellus Fall, 1922: Oygur and Wolfe (1991), Ferkinhoff and Gundersen (1983)
??Gyrinus parcus Say, 1834: KU:SEMC; a great plains sp. that is known no closer than west-central IL or eastern ND
Gyrinus pectoralis LeConte, 1868: Oygur and Wolfe (1991), Merritt et al. (2002), Bright (2015)
Gyrinus piceolus Blatchley, 1910: Ferkinhoff and Gundersen (1983); Oyger (1991) says "known only from Indiana"
Gyrinus pugionis Fall, 1922: Oygur and Wolfe (1991), Ferkinhoff and Gundersen (1983), Bright (2015)
Gyrinus sayi Aubé, 1838: Oygur and Wolfe (1991), Ferkinhoff and Gundersen (1983), Bright (2015), Andrews (1923), Hubbard and Schwarz (1878)
Gyrinus ventralis Kirby, 1837: Oygur and Wolfe (1991), Merritt et al. (2002), Bright (2015), Hubbard and Schwarz (1878), MSU-ARC
??Gyrinus woodruffi Fall, 1922: Bright (2015); based on specimen(s) at UMMZ:UMMZI that may be misidentified, but it is known as far north as central OH
The following species were reported from Michigan, but we consider them to be adventive, misidentifications or other errors:
Subfamily Gyrininae
Tribe Gyrinini
Gyrinus limbatus Say, 1825: Andrews (1923), Hubbard and Schwarz (1878); Oygur and Wolfe (1991) consider G. limbatus a "nomen inquirendum."These records prob. refer to G. aquiris or G. ventralis.
Gyrinus minutus Fabricius, 1798: Oygur and Wolfe (1991), Bright (2015), Hubbard and Schwarz (1878), Hatch (1924); Bright (2015) website says "this may be G. cavatus Atton, 1990 - check article in Can Ent. that O & W were unaware of." "Gyrinus minutus is restricted to Northern Canada, from Yukon Temtory to St. Anthony, Nfld." Atton (1990); specimens from farther south (incl. all of MI) are G. cavatus.
Gyrinus picipes Aubé, 1838: Andrews (1923), Adams (1909), Hubbard and Schwarz (1878); G. picipes is a western sp. that does not occur in MI
Gyrinus pleuralis Fall, 1922: Oygur (1988); reference not seen but Hilsenhoff (1990) says Oyger (1988) included MI for this species; however, Oyger and Wolfe (1991) do not have it in MI
This family list was last updated: November 11, 2022