Gyrophaena (s.str.) triquetra Weise, 1877

Enushchenko, Ilya V., Makarov, Kirill V. & Shavrin, Alexey V., 2024, Review of the subtribe Gyrophaenina Kraatz, 1856 (Coleoptera: Staphylinidae: Aleocharinae: Homalotini) of Kunashir Island, with notes on species of Far Eastern Russia, Zootaxa 5535 (1), pp. 1-81 : 62

3.2.15. Gyrophaena (s.str.) triquetra Weise, 1877

( Figs 253–256 , 308 )

Gyrophaena triquetra Weise, 1877: 91 ; Kim & Ahn 2010: 335, 2014: 192, Glotov 2022: 382 .

Gyrophaena sunanica Pasńik, 2001: 191 .

Gyrophaena flammula Pace, 2007: 111 .

Material examined. MARITIME PROVINCE: 1 ♂: Ussuriyskiy District, Gorno-Tayozhnoye , 43º41.680’N 132º08.378’E. In Crepidotus calolepis (Fr.) P. Karst. 27.VIII.2021. Yu.A. Rebriev leg. (cIE) ; 1 ♂: Kamenushka , 43º37.532’N 132º14.550’N. In Lentinula edodes (Berk.) Pegler. 28.VIII.2021. Yu.A. Rebriev leg. ( MSPU) .

Distribution. Gyrophaena (s.str.) triquetra is eastern Palaearctic species known from Far Eastern Russia (Maritime Province ( Fig. 308 )), North Korea, Japan and China.

Remarks. Paśnik (2001) described G. sunanica from North Korea. Kim &Ahn (2010) synonymized G. sunanica with G. triquetra . Pace (2007) described G. flammula from Taiwan. Glotov (2022) studied the type material of G. sunanica , G. triquetra and G. flammula , synonymized G. flammula with G. triquetra , and confirmed the previously established synonymy of G. sunanica . Among all known species of the affinis group, G. triquetra is most similar to G. rousi Dvořák 1966 . Based on the general structure of aedeagus (three-lobe ventral plate and long, filiform internal sac), G. triquetra is similar to the Taiwanese G. taiwanensis Pace 2007 , G. minimonstruosa Pace 2007 and G. pulli Pace 2007 (see original descriptions in Pace 2007). It can be easily distinguished from them by details of the morphology of the aedeagus and the different shape of the male abdominal tergite VIII.

Habitus as in Fig. 253 . Aedeagus as in Fig. 254 . Male abdominal tergite VIII as in Fig. 255 . Male abdominal sternite VIII as in Fig. 256 .

It is here recorded from Russia for the first time.

Figures

FIGURES 250–256. Gyrophaena (s.str.) pseudonana (Figs 250–252) and G. (s.str.) triquetra (Figs 253–256): 250, 253— habitus, 251, 254—aedeagus, lateral view, 252, 255—male abdominal tergite VIII, 256—male abdominal sternite VIII. Scale bars: 1.0 mm (Figs 250, 253), 0.1 mm (Figs 251–252, 254–256).

FIGURES 305–311. Distribution of Gyrophaena in Eastern Siberia and Far Eastern Russia: 305—G. (s.str.) pseudonana, 306—G. (s.str.) pseudonitidula, 307—G. (s.str.) pulchella, 308—G. (s.str.) triquetra, 309—G. (s.str.) williamsi, 310—G. (s.str.) zhagaensis, 311—G. (Phaenogyra) strictula.