Physunio micropterus (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

Physunio micropterus (Morelet, 1866) Fig. 3H

Unio micropterus Morelet, 1866: 63, 64. Type locality: "in torrentibus montanis Cambodiae".

Physunio micropterus : Brandt 1974: 296-297, pl. 25, fig. 60.

Material examined.

CIFI.MOL.013, CIFI.MOL.014, CIFI.MOL.015, MUMNH.UNI.2639, MUMNH.UNI.2641, MUMNH.UNI.2656, MUMNH.UNI.2661, MUMNH.UNI.2665, MUMNH.UNI.2667, MUMNH.UNI.2671, ZRC.MOL.015646, ZRC.MOL.015647, ZRC.MOL.015648.

Distribution and habitat.

Pursat River in Pursat Province, Sangkae River in Battambang Province, Sen River in Kampong Thom Province, Chi Kraeng River and Sreng River in Siem Reap Province (locality no. 7, 13, 22, 23, 27, 30, 32 and 39); in sandy substrate.

Remarks.

The distribution of Physunio micropterus is restricted to the Tonle Sap basin. There are some reports outside its endemic range, such as in the Ping and Prachinburi rivers in Thailand, but these distributions need to be confirmed ( Brandt 1974). Some specimens have been collected from Sai Khao river in Chanthaburi, Thailand (E Jeratthittikul, unpublished data), which flows into Cambodia, and finally drains into the Tonle Sap Lake.

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.