Cipangopaludina crassibuca (Sarasin & Sarasin, 1898)

Zhang, Le-Jia & von Rintelen, Thomas, 2021, The neglected operculum: a revision of the opercular characters in river snails (Caenogastropoda: Viviparidae), Journal of Molluscan Studies 87 (2), pp. 1-14 : 10

Cipangopaludina crassibuca (Sarasin & Sarasin, 1898)

( Figs 2P , 3P , 6P )

Vivipara crassibuca Sarasin & Sarasin, 1898: 60 , figs 120, 131, 132 (Lake Poso, Central Sulawesi, Indonesia).

Cipangopaludina crassibuca —Prashad, 1928: 176.

Idiopoma crassibucca —Schuh et al., 2010: https://www.discoverlife. org/mp/20q?search= Idiopoma+crassibucca .

Remarks: Vivipara crassibuca Sarasin & Sarasin, 1898 has been rarely mentioned after its description. Prashad (1928) regarded it as undoubtedly belonging to Cipangopaludina based on shell morphology. Schuh et al. (2010) assigned this species to Idiopoma in their online database but provided no justification. Here, we assign it to Cipangopaludina based on its shell morphology and the fact that its operculum exhibits the generic characters of Cipangopaludina . The operculum of C. crassibuca has denser growth lamellae compared to the other two species of Cipangopaludina examined. In addition, the convex inner margin of the first species is not as pronounced as in the other two species.

Figures

Figure 2. Exterior surface of opercula of the viviparid species studied. A. Lioplax subcarinata. B. Campeloma decisum. C, D. Callinina georgiana. E. Callinina intertexta. F. Tulotoma magnifica. G. Riƌularia auriculata. H. Amuropaludina praerosa. I. Viƌiparus ƌiƌiparus. J, K. Viƌiparus contectus. L. Mekongia jullieni. M. Tchangmargarya multilabiata. N. Tchangmargarya yangtsunghaiensis. O. Cipangopaludina nagaensis. P. Cipangopaludina crassibuca. ƍ. Cipangopaludina chinensis. R. Margarya melanioides. S. Heterogen longispira. T. Heterogen japonica. Scale bar: 5 mm.

Figure 3. Interior surface of opercula of the viviparid species studied. A. Lioplax subcarinata. B. Campeloma decisum. C, D. Callinina georgiana. E. Callinina intertexta. F. Tulotoma magnifica. G. Riƌularia auriculata. H. Amuropaludina praerosa. I. Viƌiparus ƌiƌiparus. J, K. Viƌiparus contectus. L. Mekongia jullieni. M. Tchangmargarya multilabiata. N. Tchangmargarya yangtsunghaiensis. O. Cipangopaludina nagaensis. P. Cipangopaludina crassibuca. ƍ. Cipangopaludina chinensis. R. Margarya melanioides. S. Heterogen longispira. T. Heterogen japonica. Scale bar: 5 mm.

Figure 6. Shells of the viviparid species studied. A. Lioplax subcarinata. B. Campeloma decisum. C, D. Callinina georgiana. E. Callinina intertexta. F. Tulotoma magnifica. G. Riƌularia auriculata. H. Amuropaludina praerosa. I. Viƌiparus ƌiƌiparus. J, K. Viƌiparus contectus. L. Mekongia jullieni. M. Tchangmargarya yangtsunghaiensis. N. Tchangmargarya multilabiata. O. Cipangopaludina nagaensis. P. Cipangopaludina crassibuca. ƍ. Cipangopaludina chinensis. R. Margarya melanioides. S. Heterogen longispira. T. Heterogen japonica. Scale bar:10 mm.