Monodontina cambodjensis (Petit de la Saussaye, 1865)

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

Monodontina cambodjensis (Petit de la Saussaye, 1865) Fig. 3G

Monocondylaea cambodjensis Petit de la Saussaye, 1865: 16, pl. 4, fig. 4. Type locality: "Battabbang, Cambodge".

Pseudodon cambodjensis cambodjensis : Brandt 1974: 269, pl. 19, fig. 28.

Monodontina cambodjensis : Bolotov et al. 2017: 11573.

Material examined.

CIFI.MOL.023, CIFI.MOL.024, MUMNH.UNI.2637, MUMNH.UNI.2646, MUMNH.UNI.2659, MUMNH.UNI.2670, ZRC.MOL.015652, ZRC.MOL.015653, ZRC.MOL.015654.

Distribution and habitat.

Tonle Sap River in Kampong Chhnang Province, Pursat River in Pursat Province and Sen River in Kampong Thom Province, Chi Kraeng River in Siem Reap Province (locality no. 3, 13, 23 and 33); in soft muddy or sandy substrate.

Remarks.

Not sold for food, collected as by-catch of Corbicula and Mekongia harvests, and were often observed to be discarded along with other large unionids. Monodontina cambodjensis has been recorded from Thailand and Cambodia, in several tributaries of the Mekong River ( Brandt 1974). Bolotov et al. (2017) resurrected the genus Monodontina Conrad, 1853 and used it as a generic name for Monodontina vondembuschiana (Lea, 1840) and Monodontina cambodjensis . This taxonomic opinion was based solely on molecular evidence, without any morphological revision. Monodontina cambodjensis is distinguishable from its similar congener, Monodontina vondembuschiana , by its high posterior wing and the rounded triangular shape.

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.