Cipangopaludina chinensis (Gray, 1834)

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 : 9

Cipangopaludina chinensis (Gray, 1834)

( Figs 2Q , 3Q , 6Q )

Remarks: This species has a large nuclear region with a sandpaper-like layer (nontransparent); this layer is sometimes partly or even completely absent in the nuclear region of some individuals, especially juveniles.

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.