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 family used to be part of a much larger family known as Ostomidae. Since ca. 1970 the Ostomidae has been divided several times, resulting in only seven genera remaining in this family. The most recent division (Gimmel et al. 2019) removed Peltis to Peltidae, Thymalus to Thymalidae, and four other genera to Lophocateridae.

TROGOSSITIDAE

2 subfamilies, 4 genera, 12 species

Subfamily Calitynae

Calitys scabra (Thunberg, 1784): Barron (1971), Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

Subfamily Trogossitinae

Airora cylindrica (Audinet-Serville, 1828): Barron (1971), Downie and Arnett (1996), MSU-ARC

Corticotomus cylindricus (LeConte, 1863): Barron (1971), Downie and Arnett (1996)

Corticotomus parallelus (Melsheimer, 1844): Barron (1971), Hubbard and Schwarz (1878), Downie and Arnett (1996)

Tenebroides americanus (Kirby, 1837): Barron (1971), Andrews (1923), Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

Tenebroides bimaculatus (Melsheimer, 1844): Hubbard and Schwarz (1878), Ruesink and Parsons (2024), MSU-ARC

Tenebroides collaris (Sturm, 1807): Barron (1971), Hubbard and Schwarz (1878), Downie and Arnett (1996), Evans (2014)

Tenebroides corticalis (Melsheimer, 1844): Hatch (1924), Hubbard and Schwarz (1878), MSU-ARC; while MI is not explicitly listed in Barron (1971), he says this species "is distributed across the north coast to coast"

Tenebroides laticollis (Horn, 1862): Barron (1971), Townsend (1889), MSU-ARC

Tenebroides marginatus (Palisot de Beauvois, 1811): Ruesink and Parsons (2024), MSU-ARC; Barron (1971) has northern limit just north of the Ohio River

Tenebroides mauritanicus (Linnaeus, 1758): Ruppel (1977), Hatch (1924), MSU-ARC; cosmopolitan

??Tenebroides nanus (Melsheimer, 1844): Hubbard and Schwarz (1878); known from east & south of central OH; MI record needs confirmation

This family list was last updated: March 12, 2023