Coelostoma (Lachnocoelostoma) huangi Jia, Aston & Fikáček, 2014

Jia, Fenglong, Lin, Renchao, Chan, Eric, Skale, Andre & Fikáček, Martin, 2017, Two new species of Coelostoma Brullé, 1835 from China and additional faunistic records of the genus from the Oriental Region (Coleoptera: Hydrophilidae: Sphaeridiinae: Coelostomatini), Zootaxa 4232 (1), pp. 113-122 : 120

Coelostoma (Lachnocoelostoma) huangi Jia, Aston & Fikáček, 2014

( Fig. 9 )

Material examined. THAILAND: 14 spec. ( ASHC, NMPC): Phang-nga province, Lamri district, 6 km NE Lam Khan (white banana waterfall), 8°37.324ʹN 88°18.362ʹE, 75 m a.s.l., 13.viii.2012, A. Skale lgt.; 13 spec. ( AWWC, NME, NMPC): same data, but A. Weigel lgt.

Distribution. Described recently from Chinese provinces Guangxi and Jiangxi ( Jia et al. 2014). First record for Thailand.

Remarks. The inspection of type specimens deposited in Orchymont collection in IRSNB and of the additional specimens of C. huangi listed above revealed that C. huangi is extremely similar to C. coomani diversum from Sumatra in morphology of genitalia (compare Fig. 9 for C. huangi with Fig. 10 for C. diversum ) and in external characters. All examined specimens of C. huangi have wide apices of parameres, in contrast to the examined paratype of C. coomani diversum Orchymont, 1932 ; for that reason, we consider both species as separate ones at the moment. However, studies of additional specimens from Malay archipelago would be necessary to corroborate the status of both taxa. In addition, the genitalia of C. coomani diversum differ from those of C. coomani Orchymont, 1932 (see Fig. 24 in Jia et al. 2014) in many aspects including the shape and position of the gonopore, shape of the internal sclerite of the median lobe and shape of parameres, and clearly indicate a separate species status of this taxon. For this reason, and in agreement with species concept adopted here and by Jia et al. (2014), we are elevating the taxon to species rank, as C. diversum stat. nov.

Figures

FIGURES 1 – 14. Aedeagus of Coelostoma species. 1 – 4: C. tangliangi sp. nov., paratype; 5 – 8: C. horni from southern Yunnan: Xishuangbanna; 9: C. huangi from Vietnam: 6 km NE Lam Khan; 10: C. diversum, paratype from Sumatra: Panjinggahan; 11: C. jaechi sp. nov., paratype; 12 – 14: C. subditum (12 – 13: from Yunnan: Xishuangbanna; 14: from Hongkong). All figures except Fig. 13 to the same scale.