Bineurus mouhotii (Lea, 1863)

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

Bineurus mouhotii (Lea, 1863) Fig. 3B

Monocondylaea mouhotii Lea, 1863: 190. Type locality: "Laos Mountains, Cambodia, Siam".

Pseudodon mouhoti : Brandt 1974: 265-266, pl. 19, fig. 25

Bineurus mouhotii : Pfeiffer et al. 2019: 116.

Material examined.

MUMNH.UNI.2637, MUMNH.UNI.2646, MUMNH.UNI.2659 MUMNH.UNI.2670.

Distribution and habitat.

Phumi Phsar River, Kampong Chnnang Province and Sangkae River, Battambang Province (locality no. 27 and 39); in sandy substrate of streams.

Remarks.

Bineurus mouhotii is widespread along the Mekong basin in Thailand, Laos and Vietnam, and probably in northern Myanmar and Yunnan ( Brandt 1974). The shell shape of present specimens was very inequilateral with concave ventral margin, which is a common form of the mountain race. The ventral margin of specimens collected from the downstream section is usually less concave, and nearly straight or even slightly curved ( Brandt 1974). The combination of Bineurus mouhotii is a recent revision, and first appeared in Bolotov et al. (2017). The validity of the genus Bineurus was latter confirmed by phylogenomic analysis ( Pfeiffer et al. 2019). However, the complete systematic revision of this taxon (and other related species previously included in the genus Pseudodon sensu Brandt, 1974) has yet to be investigated.

Figures

Figure 3. Freshwater bivalves of the Tonle Sap basin, Cambodia (Pharidae and Unionidae) A Novaculina siamensis B Bineurus mouhotii C Contradens contradens D Ensidens ingallsianus E Hyriopsis bialata F Hyriopsis delaportei G Monodontina cambodjensis H Physunio micropterus I Pilsbryoconcha linguaeformis J Pilsbryoconcha lemeslei and K Scabies mandarinus. Scale bars: 10 mm, unless stated otherwise. Photographs by K Macharoenboon.