Pilsbryoconcha linguaeformis (Morelet, 1875)

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

Pilsbryoconcha linguaeformis (Morelet, 1875) Fig. 3I

Anodonta linguaeformis Morelet, 1875: 329, pl. 14, fig. 5. Type locality: "au Cambodje, probablement dans les marécages voisins de Battambang".

Pilsbryoconcha linguaeformis : Simpson 1900: 587.

Pilsbryoconcha exilis linguaeformis : Brandt 1974: 265.

Material examined.

MUMNH.UNI.2616, MUMNH.UNI.2619, MUMNH.UNI.2624, MUMNH.UNI.2625, MUMNH.UNI.2636, MUMNH.UNI.2645 ZRC.MOL.015649, ZRC.MOL.015650, ZRC.MOL.015651.

Distribution and habitat.

Pond in Kampong Chhnang Province, Tonle Sap Lake in Kampong Chhnang and Kampong Thom Provinces, Banteay Meanchey Province, Sen River in Kampong Thom Province (locality no. 3, 20, 36, 38, 40, and 42); in soft muddy substrate and swampy grounds.

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. Distribution range of this species seems to be limited to the Tonle Sap basin. Brandt (1974) treated " linguaeformis " as a subspecies of Pilsbryoconcha exilis (Lea, 1838). Some authors included " linguaeformis " as a junior synonym of Pilsbryoconcha carinifera (Conrad, 1837) (e.g., Haas 1969). However, it differs from Pilsbryoconcha exilis and Pilsbryoconcha carinifera by the greater height of the posterior end.

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.