Gyrophaena (Gyrophaena) gaudens Casey, 1906

Klimaszewski, Jan, Webster, Reginald & Savard, Karine, 2009, Review of the rove beetle species of the subtribe Gyrophaenina Kraatz (Coleoptera, Staphylinidae) from New Brunswick, Canada: new species, provincial records and bionomic information, ZooKeys 22 (22), pp. 81-170 : 120-121

24. Gyrophaena (Gyrophaena) gaudens Casey

Figs 23, 152–158; Map 20

Gyrophaena (Gyrophaena) gaudens Casey, 1906: 292 ; Seevers 1951: 719; Moore and Legner 1975: 429; Campbell and Davies 1991: 106.

Description. Gyrophaena gaudens is externally similar to G. uteana but differs by infuscated antennae and the male genital features.

Map 20. Collection localities in New Brunswick, Canada of Gyrophaena gaudens

Body length 1.4–1.7 mm, narrowly oval; head piceous; pronotum dark rufo-testaceous to piceous; elytra reddish-brown with piceous sutural region and posterior angles; abdomen yellowish- or reddish-brown, apical portion often darker and piceous. Punctation: vertex of head with at least six moderately-sized umbilicate punctures on each side, pronotum with six punctures in two confused median rows and additional punctures elsewhere, elytra with fine and sparse punctures. Microsculpture: reticulate throughout, weaker on pronotum, most evident on head. Antennae as illustrated (Fig. 23). Pronotum 1.5 times as wide as long. MALE: tergite 8 with two long and narrow lateral teeth and with two (rarely three) minute median teeth [smaller and more sharply pointed than those of G. uteana ] (Fig. 154); sternite 8 rounded apically (Fig. 155). Median lobe of aedeagus with long and narrowly produced tubus which is lacking angular swelling in the middle of ventral margin, apex with subapical minute projection (Fig. 152), apical projection of internal sac elongate and irregular in shape (Fig. 152). Paramere as illustrated (Fig. 153). FEMALE. Tergite 8 truncate apically (Fig. 157); sternite 8 rounded apically and slightly pointed (Fig. 158); spermatheca as illustrated (Fig. 156).

Bionomics. Macrohabitat: mixed forest and conifer forest. Microhabitat: on/in gilled mushrooms, on small gilled mushroom on log, on Pleurotus sp. on dead standing Populus tremuloides , on polypore fungi, and on bracket fungi. This species has also been found on Cantharellus deliciosus . Collecting period: June, July, and August. Collecting method: sifting mushrooms, aspirating, and hand collecting.

Distribution (Map 20). CANADA: New Brunswick, Ontario, and Quebec; UNITED STATES: Illinois, Indiana, Massachusetts, Michigan, Pennsylvania, and Wisconsin.