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.

This group used to be included as a subfamily within Hydrophilidae.

HELOPHORIDAE

1 genus, 12 species

Helophorus angusticollis d'Orchymont, 1945: Smetana (1985), Bright (2015), Downie and Arnett (1996)

Helophorus grandis (Illiger, 1798): Bright (2015), BugGuide, Ruesink and Parsons (2023), MSU-ARC; a European sp. introduced to N.A. before 1904

Helophorus inflectus (McCorkle, 1965): Smetana (1985), Bright (2015), Downie and Arnett (1996)

Helophorus lacustris LeConte, 1850: Smetana (1985), Bright (2015), Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

Helophorus lineatus (Say, 1823): Smetana (1985), Bright (2015), Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

Helophorus marginicollis Smetana, 1985: Smetana (1985), Bright (2015), Downie and Arnett (1996)

Helophorus nitiduloides d'Orchymont, 1945: Smetana (1985), Bright (2015), Downie and Arnett (1996)

Helophorus nitidulus LeConte, 1855: Smetana (1985), Bright (2015), Andrews (1923), Hubbard and Schwarz (1878), Downie and Arnett (1996)

Helophorus oblongus LeConte, 1850: Smetana (1985), Bright (2015), Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

Helophorus orientalis Motschulsky, 1860: Smetana (1985), Bright (2015), Downie and Arnett (1996)

Helophorus sempervarians Angus, 1970: Smetana (1985), Bright (2015), Downie and Arnett (1996)

Helophorus tuberculatus (Gyllenhal, 1808): Smetana (1985), Bright (2015), Andrews (1923), Hubbard and Schwarz (1878), MSU-ARC

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

Helophorus auricollis Eschscholtz, 1822: Hubbard and Schwarz (1878) as Helophorus inquinatus Mannh.; a far western sp. w/isolated population in far eastern Canada

This family list was last updated: December 28, 2022Hydrophilidae