Bithynia siamensis goniomphalus (Morelet, 1866)

Ng, Ting Hui, Jeratthitikul, Ekgachai, Sutcharit, Chirasak, Chhuoy, Samol, Pin, Kakada, Pholyotha, Arthit, Siriwut, Warut, Srisonchai, Ruttapon, Hogan, Zeb S. & Ngor, Peng Bun, 2020, Annotated checklist of freshwater molluscs from the largest freshwater lake in Southeast Asia, ZooKeys 958, pp. 107-141 : 107

Bithynia siamensis goniomphalus (Morelet, 1866) Fig. 5I

Paludina goniomphalos Morelet, 1866: 167. Type locality: “Cochinchina”.

Bithynia (Digoniostoma) siamensis goniomphalus : Brandt 1974: 60, pl. 4, fig. 68.

Material examined.

CIFI.MOL.040, ZRC.MOL.015696, ZRC.MOL.015697, ZRC.MOL.015698, ZRC.MOL.015699, ZRC.MOL.015700, ZRC.MOL.015701.

Distribution and habitat.

Found at the edges of Tonle Sap River and Lake, ponds and in paddy fields at Kampong Chhnang, Banteay Meanchey, and Siem Reap Provinces (locality no. 3, 4, 8, 11, 16, 40, 42, 43, and 44).

Remarks.

Bithynia siamensis goniomphalus is of medical importance because it is an intermediate host of the zoonotic parasite, Opisthorchis viverrini (Poirier, 1886) (TROPMED Medical Group 1986). The role of Bithynia siamensis goniomphalus in the transmission of this parasite in Cambodia has not been investigated in detail, although the parasite has been recorded in freshwater fishes at the border of the Kandal-Takeo Provinces in the south ( Touch et al. 2009), and cases of human infections are well-studied throughout the country ( Sithithaworn et al. 2012).

Figures

Figure 5. Freshwater gastropods of the Tonle Sap basin, Cambodia A Pila gracilis B Pila pesmei C Pila virescens D Pomacea maculata E Filopaludina martensi cambodjensis F Idiopoma umbilicata G Mekongia rattei H Trochotaia trochoides I Bithynia siamensis goniomphalus J Wattebledia siamensis K Anentome cambojiensis L Anentome helena M Sulcospira housei N Melanoides tuberculata O Indoplanorbis exustus and P Radix rubiginosa. Scale bars: 10 mm, unless stated otherwise. Photographs by TH Ng.