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.
The higher classification within the Dytiscidae remains in flux. Larson et al. (2000) recognized seven subfamilies in America north of Mexico whereas BugGuide recognizes eight (as of May 2022). Subfamily Hydrotrupinae in Larson et al. (2000) is a genus in Agabinae on BugGuide. BugGuide largely follows Miller and Bergsten (2016) except regarding Cybister and Megadytes, which Miller and Bergsten (2016) have in the subfamily Cybisterinae whereas BugGuide and Larson et al. (2000) include them as a tribe in the Dytiscinae. Also, BugGuide uses tribes in fewer families than the other two sources. In this list we follow the subfamily classification used in BugGuide but have added tribal names as used in Nilsson (2015) and Miller and Bergsten (2016).
For Coptotomus longulus BugGuide says "lenticus was once considered a separate species but there is some evidence of hybridization with longulus" so they dropped lenticus completely without citing a source. Larson et al. 2000 lists both subspecies as does GBIF & Wikipedia (as of February 2021). Hybridization w/longulus would suggest subspecies status is more appropriate for lenticus. Thus our list includes both C. longulus longulus and C. longulus lenticus since both forms occur in Michigan.
DYTISCIDAE
8 subfamilies, 17 tribes, 37 genera, 159 species
Subfamily Agabinae
Tribe Agabini
Agabus aeruginosus Aubé, 1838: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), MSU-ARC
Agabus ambiguus (Say, 1823): Larson et al. (2000), Bright (2015), Hubbard and Schwarz (1878), MSU-ARC
Agabus anthracinus Mannerheim, 1852: Larson et al. (2000), Bright (2015), Hatch (1924), Hubbard and Schwarz (1878), MSU-ARC
??Agabus arcticus (Paykull, 1798): KU:SEMC; holarctic
Agabus bicolor (Kirby, 1837): Larson et al. (2000), Bright (2015)
Agabus bifarius (Kirby, 1837): Larson et al. (2000), Bright (2015), Hubbard and Schwarz (1878), MSU-ARC
Agabus confinis (Gyllenhal, 1808): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Agabus discolor (Harris, 1828): Larson et al. (2000), Bright (2015), FMNH:FMNHINS
Agabus disintegratus (Crotch, 1873): Bright (2015), Ruesink and Parsons (2022), Hubbard and Schwarz (1878), MSU-ARC
?Agabus falli (Zimmermann, 1934): FMNH:FMNHINS; reported for Livingston Co; should be in MI
Agabus immaturus Larson, 1991: Larson et al. (2000), Bright (2015)
Agabus inscriptus (Crotch, 1873): Larson et al. (2000), Bright (2015)
Agabus leptapsis (LeConte, 1878): Bright (2015), LeConte (1878), Downie and Arnett (1996), Hubbard and Schwarz (1878), MCZ; holotype from Marquette, MI
Agabus phaeopterus (Kirby, 1837): Larson et al. (2000), Bright (2015), MSU-ARC
Agabus punctatus Melsheimer, 1844: Bright (2015), Andrews (1923), Downie and Arnett (1996), MSU-ARC
Agabus punctulatus Aubé, 1838: Ruesink and Parsons (2022), Andrews (1923), Hubbard and Schwarz (1878), MSU-ARC; not in Bright (2015), but he has it from most surrounding states & ON
Agabus semipunctatus (Kirby, 1837): Larson et al. (2000), Bright (2015), Andrews (1923), Hubbard and Schwarz (1878)
Agabus subfuscatus Sharp, 1882: Larson et al. (2000), Bright (2015), Andrews (1923), Downie and Arnett (1996)
Agabus thomsoni (Sahlberg, 1871): Larson et al. (2000), Bright (2015), Adams (1909), FMNH:FMNHINS
Ilybiosoma seriatum (Say, 1823): Larson et al. (2000), Bright (2015), Hubbard and Schwarz (1878), BugGuide, MSU-ARC
Ilybius angustior (Gyllenhal, 1808): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), MSU-ARC
Ilybius biguttulus (Germar, 1824): Larson et al. (2000), Bright (2015), Merritt et al. (2002), Hubbard and Schwarz (1878), MSU-ARC
Ilybius confusus Aubé, 1838: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), KU:SEMC
Ilybius discedens Sharp, 1882: Larson et al. (2000), Bright (2015)
Ilybius erichsoni (Gemminger & Harold, 1868): Larson et al. (2000), Bright (2015), MSU-ARC, UASM:UASM
Ilybius fraterculus LeConte, 1862: Larson et al. (2000), Bright (2015), Hubbard and Schwarz (1878), MSU-ARC
?Ilybius gagates (Aubé, 1838): Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878); MI record needs confirmation, as other sp. have been confused w/gagates
Ilybius ignarus (LeConte, 1862): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Ilybius incarinatus Zimmermann, 1928: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), MSU-ARC
Ilybius oblitus Sharp, 1882: Larson et al. (2000), Bright (2015), Downie and Arnett (1996)
Ilybius opacus (Aubé, 1837): Larson et al. (2000), Bright (2015)
Ilybius picipes (Kirby, 1837): Bright (2015), Hubbard and Schwarz (1878); where did Bright get his record?
Ilybius pleuriticus LeConte, 1850: Larson et al. (2000), Bright (2015), Andrews (1923), MSU-ARC
Ilybius subaeneus Erichson, 1837: Bright (2015), Andrews (1923), FMNH:FMNHINS
Ilybius wasastjernae (Sahlberg, 1824): Larson et al. (2000), Bright (2015)
??Platambus obtusatus (Say, 1823): Andrews (1916), Andrews (1923) as Agabus obtusatus Say; itis.com has it in the genus Platambus, other sources include it in Agabus. Bright does not list is for MI, but it is known from nearby areas.
Platambus semivittatus (LeConte, 1852): Bright (2015), Downie and Arnett (1996), MSU-ARC; Bright based on specimen(s) at UMMZ:UMMZI; no publ. record other than D&A, but on all sides of MI
Subfamily Colymbetinae
Tribe Colymbetini
??Colymbetes exaratus LeConte, 1862: FMNH:FMNHINS from Washtenaw Co.
Colymbetes paykulli Erichson, 1837: Larson et al. (2000), Bright (2015), MSU-ARC, INHS:INHSIC
Colymbetes sculptilis Harris, 1829: Larson et al. (2000), Bright (2015), Andrews (1923), Hubbard and Schwarz (1878), MSU-ARC
Nartus sinuatus (LeConte, 1862): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Neoscutopterus angustus (LeConte, 1850): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Neoscutopterus hornii (Crotch, 1873): Larson et al. (2000), Bright (2015), Adams (1909), Downie and Arnett (1996)
Rhantus binotatus (Harris, 1828): Larson et al. (2000), Bright (2015), Andrews (1923), Hubbard and Schwarz (1878), MSU-ARC
Rhantus consimilis Motschulsky, 1859: Larson et al. (2000), Bright (2015), Andrews (1923), Hubbard and Schwarz (1878), MSU-ARC
Rhantus suturellus (Harris, 1828): Larson et al. (2000), Bright (2015), MSU-ARC, INHS:INHSIC
Rhantus wallisi Hatch, 1953: Larson et al. (2000), Bright (2015)
Subfamily Copelatinae
Tribe Copelatini
Copelatus chevrolati Aubé, 1838: Larson et al. (2000), Bright (2015), Hubbard and Schwarz (1878)
Copelatus glyphicus (Say, 1823): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Subfamily Coptotominae
Tribe Coptotomini
Coptotomus longulus lenticus Hilsenhoff, 1980: Hilsenhoff (1979), Downie and Arnett (1996), MSU-ARC
Coptotomus longulus longulus LeConte, 1852: Larson et al. (2000), Bright (2015), Hubbard and Schwarz (1878), MSU-ARC
Coptotomus loticus Hilsenhoff, 1980: Ruesink and Parsons (2022), MSU-ARC; original IDs by W.L. Hilsenhoff
Coptotomus venustus (Say, 1823): Ruesink and Parsons (2022), MSU-ARC; original IDs by W.L. Hilsenhoff
Subfamily Dytiscinae
Tribe Aciliini
Acilius fraternus (Harris, 1828): Hilsenhoff (1975), Bright (2015), Andrews (1923)
Acilius mediatus (Say, 1823): Hilsenhoff (1975), Bright (2015), Andrews (1923), Downie and Arnett (1996), MSU-ARC
Acilius semisulcatus Aubé, 1838: Larson et al. (2000), Bright (2015), Andrews (1916), Hubbard and Schwarz (1878), MSU-ARC
Acilius sylvanus Hilsenhoff, 1975: Hilsenhoff (1975), Larson et al. (2000), Bright (2015), Downie and Arnett (1996), MSU-ARC
Graphoderus fascicollis (Harris, 1828): Larson et al. (2000), Bright (2015), Andrews (1923), MSU-ARC
Graphoderus liberus (Say, 1825): Larson et al. (2000), Bright (2015), Andrews (1916), Leng (1920), MSU-ARC
Graphoderus occidentalis Horn, 1883: Ruesink and Parsons (2022), Bright (2015), MSU-ARC
Graphoderus perplexus Sharp, 1882: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Thermonectus basillaris (Harris, 1829): Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC; Bright says this sp. has not been recorded from MI but MSU-ARC has a specimen from Oakland Co. coll. in 1923, WI,IN,ON in Larson et al. (2000)
Tribe Cybistrini
Cybister fimbriolatus (Say, 1825): Miller (2013), Bright (2015), Andrews (1923), MSU-ARC
Tribe Dytiscini
Dytiscus carolinus Aubé, 1838: Roughley (1990), Bright (2015)
Dytiscus circumcinctus Ahrens, 1811: Larson et al. (2000), Bright (2015), Roughley (1990)
Dytiscus cordieri Aubé, 1838: Larson et al. (2000), Bright (2015), Andrews (1923), MSU-ARC
Dytiscus dauricus Gebler, 1832: Larson et al. (2000), Bright (2015), Andrews (1923), Hubbard and Schwarz (1878), MSU-ARC
Dytiscus fasciventris Say, 1824: Larson et al. (2000), Bright (2015), Andrews (1923), Hubbard and Schwarz (1878), MSU-ARC
Dytiscus harrisii Kirby, 1837: Larson et al. (2000), Bright (2015), Andrews (1923), Hubbard and Schwarz (1878), MSU-ARC
Dytiscus hybridus Aubé, 1838: Larson et al. (2000), Bright (2015), Andrews (1923), MSU-ARC
Dytiscus verticalis Say, 1823: Larson et al. (2000), Bright (2015), Andrews (1923), MSU-ARC
Tribe Hydaticini
Hydaticus aruspex Clark, 1864: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), MSU-ARC
Hydaticus piceus LeConte, 1863: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Subfamily Hydroporinae
Tribe Bidessini
?Bidessonotus inconspicuus (LeConte, 1855): Downie and Arnett (1996), Bright (2015) based on specimen(s) at UMMZ:UMMZI; no publ. record other than D&A, but on all sides of MI
Liodessus affinis (Say, 1823): Larson et al. (2000), Bright (2015), Hatch (1924), MSU-ARC
Liodessus cantralli (Young, 1953): Larson et al. (2000), Bright (2015), Epler (2010), Downie and Arnett (1996), MSU-ARC
Liodessus crotchi Nilsson, 2001: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Liodessus flavicollis (LeConte, 1855): Larson et al. (2000), Bright (2015), Andrews (1923), Hubbard and Schwarz (1878), MSU-ARC
??Liodessus obscurellus (LeConte, 1852): KU:SEMC from Gogebic Co, Lake Gogebic
Uvarus granarius (Aubé, 1838): Epler (2010), Bright (2015), Hubbard and Schwarz (1878)
Uvarus lacustris (Say, 1823): Bright (2015), Hubbard and Schwarz (1878), MSU-ARC
Tribe Hydroporini
Boreonectes griseostriatus (DeGeer, 1774): Bright (2015), Andrews (1923), Hubbard and Schwarz (1878), MSU-ARC
??Deronectes depressicollis (Rosenhauer, 1856): NMSU:NMSU from Alger Co, Oanta Twp; very doubtful record
Heterosternuta pulchra (LeConte, 1855): Ruesink and Parsons (2022), MSU-ARC; WI,IL,OH,ON in Larson et al. (2000)
Heterosternuta wickhami (Zaitzev, 1908): Ruesink and Parsons (2022), Bright (2015), UMMZ:UMMZI, MSU-ARC
Hydrocolus paugus (Fall, 1923): Larson et al. (2000), Bright (2015), MSU-ARC
Hydrocolus persimilis (Crotch, 1873): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Hydrocolus stagnalis (Gemminger & Harold, 1868): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), MSU-ARC
Hydroporus americanus Aubé, 1838: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
?Hydroporus appalachius Sherman, 1913: Downie and Arnett (1996); Bright says this sp. has not been recorded from MI but "expect it in the UP".
Hydroporus badiellus Fall, 1923: Larson et al. (2000), Bright (2015), MCZ
Hydroporus brevicornis Fall, 1917: Larson et al. (2000), Bright (2015)
Hydroporus columbianus Fall, 1923: Larson et al. (2000), Bright (2015), Downie and Arnett (1996); most other records from far northwest
Hydroporus dentellus Fall, 1917: Larson et al. (2000), Bright (2015), Hatch (1924), Downie and Arnett (1996), MSU-ARC
Hydroporus despectus Sharp, 1882: Bright (2015), Downie and Arnett (1996), MSU-ARC
Hydroporus dichrous Melsheimer, 1844: Larson et al. (2000), Bright (2015), Andrews (1916), Hubbard and Schwarz (1878), MSU-ARC
Hydroporus fuscipennis Schaum, 1868: Bright (2015), Downie and Arnett (1996), KU:SEMC, MSU-ARC
Hydroporus gossei Larson and Roughley, 2000: Larson et al. (2000), Bright (2015)
Hydroporus melsheimeri Fall, 1917: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), MSU-ARC
??Hydroporus memnonius Nicolai, 1822: FMNH:FMNHINS from Kent Co; a European sp., prob. should not be in MI
Hydroporus morio Aubé, 1838: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878)
Hydroporus niger Say, 1823: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Hydroporus notabilis LeConte, 1850: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), KU:SEMC
Hydroporus obscurus Sturm, 1835: Larson et al. (2000), Bright (2015), Leng (1920), Downie and Arnett (1996)
Hydroporus rectus Fall, 1923: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), MSU-ARC
Hydroporus rufilabris Sharp, 1882: Larson et al. (2000), Bright (2015)
Hydroporus rufinasus Mannerheim, 1852: Larson et al. (2000), Bright (2015)
Hydroporus signatus Mannerheim, 1853: Larson et al. (2000), Bright (2015), Hatch (1924), MSU-ARC
Hydroporus striola (Gyllenhal, 1826): Larson et al. (2000), Bright (2015), Hatch (1924), Downie and Arnett (1996), MSU-ARC
Hydroporus tartaricus LeConte, 1850: Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Hydroporus tenebrosus LeConte, 1850: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Hydroporus tristis (Paykull, 1798): Larson et al. (2000), Bright (2015), Andrews (1923), Hubbard and Schwarz (1878), MSU-ARC
Nebrioporus rotundatus (LeConte, 1863): Larson et al. (2000), Bright (2015), Hubbard and Schwarz (1878), MSU-ARC
Neoporus clypealis (Sharp, 1882): Larson et al. (2000), Bright (2015), MSU-ARC
?Neoporus dimidiatus (Gemminger and Harold, 1868): Downie and Arnett (1996); in Ontario very close to MI, but no MI record found
??Neoporus lecontei Nilsson, 2001: Hubbard and Schwarz (1878) as Hydroporus mixtus Lec.; probably does not occur in MI
Neoporus mellitus (LeConte, 1855): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), FMNH:FMNHINS
Neoporus spurius (LeConte, 1855): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), FMNH:FMNHINS
Neoporus striatopunctatus (Melsheimer, 1844): Larson et al. (2000), Downie and Arnett (1996)
Neoporus superioris (Balfour-Browne, 1944): Downie and Arnett (1996), MSU-ARC; Bright says this sp. has not been recorded from MI but expect in UP.
Neoporus tennetum (Wolfe, 1984): Larson et al. (2000), Bright (2015)
Neoporus undulatus (Say, 1823): Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), UMMZ:UMMZI, MSU-ARC
Neoporus vitiosus (LeConte, 1855): Larson et al. (2000), Bright (2015), Downie and Arnett (1996)
??Neoporus vittatipennis (Gemminger and Harold, 1868): UASM:UASM from Van Buren Co, South Haven
??Neoporus vittatus (LeConte, 1855): Downie and Arnett (1996) as Hydroporus vittatus LeConte; MI record needs confirmation; not found in any other source
Oreodytes laevis (Kirby, 1837): Bright (2015), Downie and Arnett (1996)
Oreodytes scitulus (LeConte, 1855): Larson et al. (2000), Bright (2015), Downie and Arnett (1996)
Sanfilippodytes pseudovilis (Young, 1953): (Young 1953), Bright (2015), Downie and Arnett (1996), MSU-ARC; holotype from MI
Hydrovatus pustulatus (Melsheimer, 1844): Larson et al. (2000), Bright (2015), Hubbard and Schwarz (1878), MSU-ARC
Tribe Hygrotini
Clemnius laccophilinus (LeConte, 1878): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
?Clemnius sylvanus (Fall, 1917): Bright (2015), Hatch (1924); based on specimen(s) at UMMZ:UMMZI
Hygrotus acaroides (LeConte, 1855): Bright (2015), Downie and Arnett (1996), FMNH:FMNHINS; based on specimen(s) at SI:NMNH; no publ. record except D&A, but on all sides of MI
Hygrotus compar (Fall, 1919): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), MSU-ARC
Hygrotus dissimilis (Gemminger & Harold, 1868): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), MSU-ARC
Hygrotus falli (Wallis, 1924): Larson et al. (2000), Bright (2015), MSU-ARC
Hygrotus farctus (LeConte, 1955): Larson et al. (2000), Bright (2015), Downie and Arnett (1996)
Hygrotus impressopunctatus (Schaller, 1783): Larson et al. (2000), Bright (2015), Andrews (1923), Hubbard and Schwarz (1878), MSU-ARC
Hygrotus marklini (Gyllenhal, 1813): Larson et al. (2000), Bright (2015), Downie and Arnett (1996)
Hygrotus nubilus (LeConte, 1855): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
?Hygrotus patruelis (LeConte, 1855): Bright (2015); based on specimen(s) at UMMZ:UMMZI
Hygrotus picatus (Kirby, 1837): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), MSU-ARC
??Hygrotus punctilineatus (Fall, 1919): Bright (2015); based on specimen(s) at UMMZ:UMMZI; ID questionable as this is a western sp.
Hygrotus sayi Balfour-Browne, 1944: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), MSU-ARC
Hygrotus sellatus (LeConte, 1866): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), MSU-ARC
Hygrotus suturalis (LeConte, 1850): Bright (2015), Downie and Arnett (1996), MSU-ARC; "type specimen [of syn. H. ovoideus] from Eagle Harbor, MI"
Hygrotus turbidus (LeConte, 1855): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Tribe Hyphydrini
Desmopachria convexa (Aubé, 1838): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Tribe Laccornini
Laccornis conoideus (LeConte, 1850): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878)
Laccornis deltoides (Fall, 1923): Larson et al. (2000), Bright (2015)
Laccornis latens (Fall, 1937): Larson et al. (2000), Bright (2015)
Tribe Methlini
Celina hubbelli Young, 1979: Larson et al. (2000), Bright (2015), Downie and Arnett (1996), MSU-ARC
Subfamily Laccophilinae
Tribe Agabetini
Agabetes acuductus (Harris, 1828): Ruesink and Parsons (2022), Andrews (1923), FMNH:FMNHINS, MSU-ARC; Bright says this sp. has not been recorded from MI, is known on all sides
Tribe Laccophilini
Laccophilus biguttatus Kirby, 1837: Larson et al. (2000), Bright (2015), MSU-ARC
Laccophilus fasciatus Aubé, 1838: Hilsenhoff (1992), Bright (2015), Hubbard and Schwarz (1878), MSU-ARC
Laccophilus maculosus Say, 1823: Larson et al. (2000), Bright (2015), Andrews (1923), Hubbard and Schwarz (1878), FMNH:FMNHINS
Laccophilus proximus Say, 1823: Larson et al. (2000), Bright (2015), FMNH:FMNHINS
Laccophilus undatus Aubé, 1838: Ruesink and Parsons (2022), MSU-ARC; WI,IL eUS in Larson et al. 2000
Subfamily Matinae
Tribe Matini
Matus bicarinatus (Say, 1823): Larson et al. (2000), Bright (2015), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Matus ovatus Leech, 1941: Larson et al. (2000), Bright (2015), MSU-ARC
The following 24 species were reported from Michigan, but we consider them to be adventive, misidentifications or other errors:
Agabus coxalis Sharp, 1882: Downie and Arnett (1996); A. coxalis is in Alaska & far NW Canada; does not occur in MI.
Agabus erytropterus (Say, 1823): Andrews (1923); occurs only in and east of the Appalachian Mountains, cannot be in MI
Agabus infuscatus Aubé, 1838: Andrews (1923); Canada only in Larson et al. (2000)
Agabus lutosus LeConte, 1853: Hubbard and Schwarz (1878) as Gaurodytes lutosus Cr.; presume they meant Lec., but A. lutosus is a west coast sp.
Agabus obsoletus LeConte, 1858: Andrews (1923); A. obsoletus is a Calif. sp. that does not occur in MI.
Agabus taeniolatus (Harris, 1828): Townsend (1889), FMNH:FMNHINS; known only from the central Atlantic seaboard, should not be in MI
Ilybius ater (De Geer, 1774): FMNH:FMNHINS from Cheboygan Co; a European sp., should not be in MI
Rhantus bistriatus (Bergsträsser, 1778): Hatch (1924), Andrews (1923), Hubbard and Schwarz (1878); R. bistriatus is a European sp. that does not occur in NA.
Coptotomus interrogatus (Fabricius, 1801): Andrews (1923), Hubbard and Schwarz (1878), KU:SEMC, FMNH:FMNHINS; a southern & east coast species, does not occur in MI (Hilsenhoff, 1980)
Dytiscus marginalis Linnaeus, 1758: Andrews (1916), FMNH:FMNHINS; Palearctic, not in NA
Hydaticus continentalis Balfour-Browne, 1944: Hatch (1924), Andrews (1916), Hubbard and Schwarz (1878) as Hydaticus stagnalis Fab.; a European sp. not known from NA
Hydaticus wattsi Daussin, 1980: KU:SEMC from Cheboygan Co; may be an Australian sp. name, definitely not in NA
Hydrocolus filiolus (Fall, 1923): Downie and Arnett (1996) as Hydroporus filiolus Fall; an east coast sp., should not occur in MI
Hydrocolus oblitus (Aubé, 1838): Leng (1920), Hubbard and Schwarz (1878) as Hydroporus oblitus Aub.; an eastern & Gulf Coast sp. that should not occur in MI
Hydroporus glabriusculus Aubé, 1838: Downie and Arnett (1996); a European sp. not known from NA, but mistakenly reported here for many years
Hydroporus subpubescens LeConte, 1852: Hubbard and Schwarz (1878); a west coast sp. that does not occur in MI.
Nebrioporus depressus (Fabricius, 1775): Hatch (1924), KU:SEMC as Deronectes depressus (Fab.); a far northern sp., should not occur in MI
Nebrioporus elegans (Panzer, 1794): Downie and Arnett (1996) as Deronectes elegans (Panzer); a European sp. not known from NA, reported as Deronectes brevis Sturm in Andrews (1923)
Neoporus dilatatus (Fall, 1917): Downie and Arnett (1996) as Hydroporus dilatatus Fall; an east coast sp., does not occur in MI
Sanfilippodytes planiusculus (Fall, 1923): Downie and Arnett (1996), NMSU:NMSU as Hydroporus planiusculus Fall; a far NE NA sp., should not occur in MI
Sanfilippodytes vilis (LeConte, 1852): Hubbard and Schwarz (1878) as Hydroporus vilis Lec.; a western sp. that does not occur in MI.
Hygrotus inaequalis (Fabricius, 1777): Andrews (1916), Hubbard and Schwarz (1878), KU:SEMC; as Hydroporus inaequalis Fab. in Andrews (1916), a European sp., does not occur in NA.
Laccornis difformis (LeConte, 1855): Downie and Arnett (1996); an east coast sp., does not occur in MI
Laccophilus mexicanus atristernalis Crotch, 1873: Hubbard and Schwarz (1878) as Laccophilus atristernalis Cr.; a western sp. that does not occur in MI.
This family list was last updated: May 7, 2022