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 .