Tonkinospira Jochum, Slapnik & Pall-Gergely

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 : 30-31

Genus Tonkinospira Jochum, Slapnik & Pall-Gergely nom. n.

Systenostoma Bavay & Dautzenberg, 1908: Journal de Conchyliologie, 56: 243.

Systenostoma - Bavay and Dautzenberg 1909: Journal de Conchyliologie, 57: 196. (diagnosis).

Remarks.

The name Systenostoma Bavay & Dautzenberg, 1908 is preoccupied (non Systenostoma Marsson 1887, Bryozoa ). Therefore, Tonkinospira Jochum, Slapnik & Páll-Gergely nom. n. is proposed as replacement.

Type species.

Helix (Systenostoma) pauperrima Bavay & Dautzenberg, 1908 by subsequent designation ( Pilsbry 1917).

Diagnosis.

A genus of small, conical or depressed-conical species with regularly growing, rounded or angulated whorls. The sculpture is characterized by spiral lines on both the protoconch and the teleoconch, decussated by irregular radial lines resulting in a reticulated surface structure. The aperture is toothless, adnate or slightly adnate and shows a sharp peristome.

Etymology.

The new name is established by the fusion of Tonkin (northern Vietnam, the area of distribution) and the Latin spira (a coil, twist). Gender: feminine.

Remarks.

Tonkinospira differs from Krobylos by the increased degree of angulation of the whorls and the lack of spiral lines on the teleoconch. For differences with Angustopila gen. n., see above.

The systematic position of the genus is questionable. It most probably belongs to the family Hypselostomatidae , but its relationship with other families such as Helicodiscidae (see Schileyko 1998) or Valloniidae (see Schileyko 2011) cannot be excluded.

Distribution.

So far, the genus is reported from Northern Vietnam only.