Coelostoma (Lachnocoelostoma) surkhetensis Hebauer, 2002

Mai, Zuqi, Hu, Jian & Jia, Fenglong, 2022, Additional fauna of Coelostoma Brulle, 1835 from China, with re-establishment of Coelostoma sulcatum Pu, 1963 as a valid species (Coleoptera, Hydrophilidae, Sphaeridiinae), ZooKeys 1091, pp. 15-56 : 15

Coelostoma (Lachnocoelostoma) surkhetensis Hebauer, 2002

Figures 8A-E , 16H

Material examined.

China: Xizang: 1 male (SYSU), Muotuo County, Miri Village , 29°25'06"N, 95°24'23"E, 820 m, 23.vi.2018, Shi-shuai Wang & Zu-long Liang leg. ; 6 spec. (SYSU), Muotuo County, Muotuo Town , 29.269°N, 95.227°E, 766 m, in a stream beside 219 national highway, Qian-le Lu leg.

Diagnosis.

Length 5.4-5.8 mm. Head, pronotum and elytra with similar punctation. Prosternum carinate medially, with a prominent tooth anteromedially. Elytra not parallel-sided in the middle, without serial punctures laterally. Mesofemora densely pubescent, except on extreme apex. First abdominal ventrite with distinct median carina on basal two-thirds. Fifth ventrite slightly emarginate and with a row of stout setae apically. Aedeagus (Fig. 8D, E ): 1.2 mm long. Median subtruncate apically, nearly parallel-sided throughout; gonopore situated subapically.

Biology

(Fig. 16H ). On the basis of private communication to collector Mr. Qian-Le Lu, the specimens from Xizang were collected on wet stones on the edges of a forest stream. A single specimen of C. phototropicum Jia, Angus & Bian, 2019 was collected at the same place.

Distribution.

Previously known only from Nepal ( Hebauer 2002; Przewoźny 2021). New record for China (Xizang).

Figures

Figure 8. Coelostoma (Lachnocoelostoma) surkhetensis Hebauer, 2002 A dorsal view B ventral view C lateral view D, E aedeagus D dorsal view E ventral view. Scale bars: 1.0 mm (A-C); 0.5 mm (D, E).

Figure 16. Habitats of Chinese Coelostoma spp. A C. turnai Hebauer, 2006 active at wet rocky ground beside a river at night (Fujian) B C. sulcatum Pu, 1963 on sandy gutterway with shallow flowing waters at night (Guangdong) C C. phallicum Orchymont, 1940 hided under a brick beside the wastewater during the day (Guangdong) D C. phallicum Orchymont, 1940 dived under water and fed on algal mats at night (Guangdong) E C. bifidum Jia, Aston & Fikacek on wet stone wall at night (Guangdong) F C. sulcatum Pu, 1963 on muddy edge of artificial lake at night (Yunnan) G C. nankunshanense sp. nov. on a stone in the middle of a forest stream at night (Guangdong) H C. surkhetensis Hebauer, 2002 in a wet stone on the edges of a forest stream at night (Xizang) I C. wui Orchymont, 1940 on the edges of a mountain river at night (Shanxi) J C. sulcatum Pu, 1963 on muddy edges of brackish lagoon at night, with a marine Amphipoda beside it (Macao) K C. nankunshanense sp. nov. mating at night (Guangdong) L C. wui Orchymont, 1940 ovipositing eggs on wet land at night (Shanxi).