Physomerinus pedator (Sharp, 1883)

Yin, Zi-Wei, Jiang, Ri-Xin & Chen, Zhi-Bing, 2017, Notes on the Pselaphinae (Coleoptera: Staphylinidae) in Shanghai, China, Zootaxa 4238 (3), pp. 433-439 : 435

Physomerinus pedator (Sharp, 1883)

( Figs 1 B, 3B–C, 3H–I, 4A, 4C)

Material examined. China: 110 ♂♂, 30 ♀♀, labeled ‘ China: Shanghai, Minhang District (闵行区), 31°01'05"N, 121°27'15"E, mud bank along river, under weeds, rotten wood, sifted, 04./ 10.iv.2014, Hu, Peng, Song & Yin leg.’ ( SNUC) . Japan (for comparison): 1 ♂, 1 ♀, labeled ‘Riv. Kushidagawa, Matsunase-cho. Matsuzaka City, Mie Pref., 29.iv.2002, Yasuko Kawakami leg.’ ; 1 ♂, labeled ‘ TSUDA, TOKUSHIMA, 1965 ix-18, M Sakai’ ; 1 ♂, labeled ‘ ḞMfflāuḛẋ, Èñƌ , äẍḃ, 1997. viii.13, 西田光康採集 ’ ; 1 ♀, labeled ‘ Daishibashi, Ryokuchi, Tamagawa , Ota-ku , Tokyo, [ Hongshu , JAPAN], 4.v.2007, S. Nomura leg.’ ; 1 ♀, labeled ‘ Japan; Honshu, Momiya Riv., Kuji Cho, Hitachi Shi , Ibaragi Ken , 12.v.2002, KAMEZAWA, Hiromu leg., ḚIJḆƂËƜƙflḃ, ãfifflā 口 ’ (all in NSMT) .

Distribution. Japan: Honshu, Shikoku, Kyûshû, Gotô-rettô, Yaku-shima; China: Shanghai (new provincial record), Zhejiang, Hainan.

Comments. Physomerinus pedator ( Fig. 1 B) is characterized by the male metafemora possessing a large cavity in which a basally pedunculate and apically expanded projection is situated. The populations from Shanghai and Japan are externally similar ( Fig. 3 B–C; Nomura 1991: fig. 133A, 133D), and their aedeagi exhibit only slight variation ( Fig. 3 H–I; Nomura 1991: fig. 134A–B). All individuals from Shanghai were collected under weeds or in decaying woods at a mud bank along a river in April ( Fig. 4 A, 4C).

Figures

FIGURE 1. Dorsal habitus of male. A. Batriscenellus xijiaogongyuan sp. n. B. Physomerinus pedator. Scale bars: 0.5 mm.

FIGURE 3. Diagnostic features of species (A, D, E – G. Batriscenellus xijiaogongyuan. B – C, H – I. Physomerinus pedator. J. Batrisus sibiricus). A – B. Head and pronotum. C. Metafemur. D. Abdominal tergite IV. E, H. Aedeagus, in lateral view. F, I. Aedeagus, in ventral view. G. Aedeagus, in axial view. J. Aedeagus, in dorsal view. Scales bars: 0.2 mm in A – D, 0.1 mm in E – J.

FIGURE 4. Collecting sites and habitats of the Pselaphinae in Shanghai. A. Collecting sites of Batriscenellus xijiaogongyuan (1), Batrisus sibiricus (2), Physomerinus pedator (3), and Batriscenellus orientalis (4). B. Habitat of Batriscenellus xijiaogongyuan. C. Habitat of Physomerinus pedator.