IX. Gyrophaena (Gyrophaena) affinis species group (Seevers, 1951: 694) 12. Gyrophaena (Gyrophaena) affinis Sahlberg *

Figs 11, 78–84; Map 8

Gyrophaena affinis Sahlberg 1834: 383; Seevers, 1951: 695; Moore and Legner 1975: 427; Campbell and Davies 1991: 106.

Gyrophaena subpunctata Casey, 1906: 299 . Synonymized by Seevers 1951: 695.

Gyrophaena lacustris Casey, 1906: 299 . Synonymized by Seevers 1951: 695.

Description. Body length 1.7–2.1 mm, narrowly oval; head rufo-piceous to piceous; pronotum flavate to light brown; elytra testaceous to light brown; abdomen rufo-flavate, apical part of abdomen usually darker. Punctation: vertex of head with about 10 large umbilicate punctures on each side, pronotum with a few large punctures, elytra with numerous shallow punctures. Microsculpture: reticulate throughout. Antennae as illustrated (Fig. 11). Pronotum 1.4 times as wide as long. MALE: tergite 8 with two long lateral teeth, margin smooth between them (Fig. 80); sternite 8 broadly rounded apically (Fig. 81). Median lobe of aedeagus with narrowly triangular and subapically split tubus, its venter sinuate and angulate basally, apex narrow and rounded (Fig. 78), dorsal projection of internal sac moderately elongate and coiled with flagellum inside (Fig. 78). Paramere as illustrated (Fig. 79). FEMALE. Tergite 8 truncate apically (Fig. 83); sternite 8 broadly rounded apically and pointed medially (Fig. 84); spermatheca as illustrated (Fig. 82).

Map 8. Collection localities in New Brunswick, Canada of Gyrophaena affinis

Bionomics. Macrohabitat: mixed forest, 8.5-year-old regenerating mixed forest, eastern white cedar swamp, mature red spruce, and red maple forest. Microhabitat: on/ in gilled mushrooms on forest floor, on log, and on a stump, on small gilled mushrooms on side of decayed log. This species has also been found in rotting mushrooms, on orange bracket (polypore) fungus, on bracket fungus on white birch, and on Pleurotus sp. on dead standing Populus tremuloides . Collecting period: June, July, August, and September. Collecting method: sifting mushrooms, aspirating, and hand collecting specimens.

Distribution (Map 8). This is an adventive Palaearctic species in North America. CANADA: British Columbia, Manitoba, New Brunswick, Nova Scotia, and Quebec; UNITED STATES: District of Columbia, Illinois, Indiana, Iowa, Kentucky, Maine, Massachusetts, Michigan, Minnesota, Missouri, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Pennsylvania, Tennessee, Washington, West Virginia, and Wisconsin.