Angustopila 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 : 25-26

Genus Angustopila Jochum, Slapnik & Pall-Gergely gen. n.

Type species.

Systenostoma tamlod Panha & Burch, 1999.

Diagnosis.

Angustopila gen. n. is characterized by a very small, smooth, conical shell with regular, moderately increasing whorls. The body whorl sometimes extends beyond the penultimate whorl in profile. The sculpture of the protoconch is usually ornamented by spiral and radial lines resulting in a powdery, reticulated surface. The protoconch is slightly recessed into the second whorl. Aperture slightly or not adnate, with usually one or two denticles, peristome slightly reflexed.

Etymology.

The name derives from the combination of the Latin angustus (= narrow) and pila (= pillar, column). Gender: feminine.

Remarks.

Angustopila gen. n. differs from Tonkinospira nom. n. (former Vietnamese Systenostoma ) by smaller shell size, more elevated spire, slightly reflexed apertural rim and general dentition present within the aperture. Acinolaemus usually has more teeth and a turban-like shell. Krobylos species have angulated whorls, lack spiral lines on the shell and possess a relatively large, toothless, adnate aperture.

Distribution.

The genus is known from Thailand and Malaysia. The Chinese Angustopila huoyani sp n. is located very distant, almost 1500 km from the northern Thai localities.