Tonkinospira defixa (Bavay & Dautzenberg, 1912)

Jochum, Adrienne, Slapnik, Rajko, Kampschulte, Marian, Martels, Gunhild, Heneka, Markus & Pall-Gergely, Barna, 2014, A review of the microgastropod genus Systenostoma Bavay & Dautzenberg, 1908 and a new subterranean species from China (Gastropoda, Pulmonata, Hypselostomatidae), ZooKeys 410, pp. 23-40 : 31

Tonkinospira defixa (Bavay & Dautzenberg, 1912) Figure 1

Systenostoma defixa Bavay & Dautzenberg, 1912: Journal de Conchyliologie, 60: 22-23, Plate 1, Fig. 18-19. [ “Île de la Table, baie d’Along”].

Systenostoma defixa - Pilsbry 1917: Manual of Conchology …: 226, Plate 38, Figs 15-16.

Material examined.

Systenostoma defixa (Bavay & Dautzenberg, 1912) (2 specimens), RBINS Dautzenberg Collection reg. nr. IG 10591 (tray 844), probably syntypes.

Remarks.

The whole shell, including the protoconch, is covered with regular, very fine spiral threads. The spiral lines are decussated with rather irregular radial lines, creating a reticulated surface.