Coelostoma (Holocoelostoma) stultum (Walker, 1858)

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 (Holocoelostoma) stultum (Walker, 1858)

Figures 9B , 11A-F

Note.

For complete synonymy, see Hansen (1999).

Material examined.

China: Guangdong: 3 spec. (SYSU), Sihui District, Dasha Town , 5.vi.1998, Feng-long Jia leg. ; 1 male (SYSU), Huaxian County, Dapuling , 26.viii.1983, Zhi-he Huang leg. ; 2 spec. (SYSU), Lianjiang District , 25.ix.1985, Wu Wu leg. ; 1 male (SYSU), Xinhui District , viii.2001, Xiao-li Tong leg. ; Guangxi: 45 spec. (SYSU), Yangshuo (阳朔), viii.1984, Shou-jian Chen leg. ; 6 spec. (SYSU), Shiwandashan Forest Park, 267 m, light trap, 9.vii.2011, Ke-qing Song leg. ; Hainan: 1 male (SYSU), Lingshui, Diaoluoshan Mountain, Xiaomei (小妹), 29.xi.1963, Bai-ge Chen leg. ; Hubei: 1 male (SYSU), Wuhan City, Wuhan Botanical Garden , 31.viii.2020, Zi-hao Shen leg. ; Hunan: 2 spec. (SYSU), Yizhang (宜章), 16.iii.1941, Zhe-long Pu leg. ; Jiangxi: 4 spec. (SYSU), Jing’an County, Guanyinyan (观音岩), 29°01'48"N, 115°25'00"E, 195 m, 1.viii.2015, Ren-chao Lin & Yu-dan Tang leg. ; 3 spec. (SYSU), Jiujiang District, Duchang County, Linshan Village Committee, 15-20.viii.2010, Yan Mei leg. ; Yunnan: 5 spec. (SYSU), Mengla Nature Reserve , 4-5.viii.2007, Jia-hui Li leg. ; Zhejiang: 1 male (SYSU), Quzhou City, Kecheng District , 29.0063°N, 118.8063°E, 112 m, 15.iii.2020, Zhuo-yin Jiang leg. ; 1 male (SYSU), Quzhou City, Kecheng District, Wangdu Village , 28.9875°N, 118.6898°E, 102 m, 7.iii.2020, Zhuo-yin Jiang leg. ; 7 spec. (SYSU), Kaihua County, Zawanhua (砸碗花) Wetland Park , 11.iii.2020, Zhuo-yin Jiang leg.

Additional material examined.

Cambodia: 17 spec. (SYSU), Boeng, Kampong Thom Pro., Khleng , light trap beside a rice field, 13.viii.2017, Zu-qi Mai leg.

Diagnosis.

Length 4.3-5.2 mm. similar to C. sulcatum in morphological characters. Aedeagus (Fig. 11A-F ): 0.8-1.0 mm long. Median lobe widest basally, distinctly narrowed medially, then slightly widened at apical third; gonopore situated apically. Parameres longer than median lobe, outer face continually curved and strongly curved inwards apically.

Biology.

This species has the similar habitations of C. sulcatum Pu, 1963.

Occurrence in China.

This species was reported widely distributed in China (Chongqing, Fujian, Guangxi, Guangdong, Jiangxi, Hainan, Hunan, Hong Kong, Shandong, Sichuan, Taiwan, Yunnan, Xizang) ( Jia et al. 2014, 2017; Liu et al. 2020; Przewoźny 2021). However, some records should be based on misidentification. We examined all the specimens assigned as C. stultum in SYSU. After excluded the specimens of C. sulcatum , the distribution of C. stultum in China is confirmed: Guangdong, Guangxi, Jiangxi, Hainan, Hubei, Hunan, Taiwan, Yunnan, Zhejiang.

Figures

Figure 9. Dorsal view of Chinese Holocoelostoma A Coelostoma sulcatum Pu, 1963 B Coelostoma stultum (Walker, 1858). Scale bar: 1.0 mm (A, B).

Figure 11. Aedeagus of Coelostoma stultum (Walker, 1858) (dorsal view) A from Huaxian County (Guangdong) B from Sihui District (Guangdong) C from Mt. Shiwandashan (Guangxi) D from Yangshuo (Guangxi) E from Yizhang (Hunan) F from Mt. Diaoluoshan (Hainan). Scale bar: 0.5 mm (A-F).