Succinea tenuis Morelet, 1865

Sutcharit, Chirasak, Thach, Phanara, Chhuoy, Samol, Ngor, Peng Bun, Jeratthitikul, Ekgachai, Siriwut, Warut, Srisonchai, Ruttapon, Ng, Ting Hui, Pholyotha, Arthit, Jirapatrasilp, Parin & Panha, Somsak, 2020, Annotated checklist of the land snail fauna from southern Cambodia (Mollusca, Gastropoda), ZooKeys 948, pp. 1-46 : 1

Succinea tenuis Morelet, 1865 Figs 3G , 7D

Succinea tenuis Morelet, 1865: 225, 226. Type locality: Cochinchina [South Vietnam]. Breure et al. 2018: 450, figs 1129, 1130.

Succinea tenella Morelet, 1875: 244, pl. 12, fig. 5 [unjustified emendation].

Material examined.

Locality no. 12: CUMZ-CM106 (2 shells), CUMZ-CM107 (2 specimens in ethanol; Figs 3G , 7D ). The snails were found to live on tree trunks and leaves.

Distribution.

Cambodia, Thailand and Vietnam ( Schileyko 2011).

Remarks.

We placed these Cambodian specimens under S. tenuis [= S. tenella Morelet, 1875] due to their appearance resembling the syntype that was recently figured in Breure et al. (2018: figs 1129, 1130). The diagnostic characters of this species are succiniform with thin and fragile shell, with ca. 3 whorls. The last whorl is very large, greatly expanded with approaching the shell height; the shell surface has strong irregular growth lines.

There is one species, S. cochinchinensis Crosse & Fischer, 1863 [= S. cochinchinensis Pfeiffer, 1865, junior homonym and junior synonym] reported from this area ( Schileyko 2011). This nominal species was described from “Saigon”. However, the original description was very brief, and the type specimens have not been figured. Examination of types of S. cochinchinensis may reveal them to be conspecific with S. tenuis .

Figures

Figure 3. Living snails of A Lagocheilus klobukowskii (Morlet, 1885) B Lagocheilus landesi (Morlet, 1885) C Pupina crosseana Morlet, 1883 D Valiguna siamensis (Martens, 1867) E, F Valiguna sp. E notum or dorsal view and F hyponotum or ventral view G Succinea tenuis Morelet, 1865 and H Hypselostoma cambodjense Benthem Jutting, 1962. All not to scale.

Figure 7. A, B Lagocheilus klobukowskii (Morlet, 1885) A yellowish morph and B purplish-black morph C Pupina crosseana Morlet, 1883 D Succinea tenuis Morelet, 1865 and E, F Hypselostoma benetuitum Vermeulen et al., 2019 E from locality no. 11 (type locality) and F from locality no. 17.