Pseudostreptaxis Moellendorff , 1890

Pall-Gergely, Barna, Schilthuizen, Menno, Oerstan, Aydin & Auffenberg, Kurt, 2019, A review of Aulacospira Moellendorff, 1890 and Pseudostreptaxis Moellendorff, 1890 in the Philippines (Gastropoda, Pupilloidea, Hypselostomatidae), ZooKeys 842, pp. 67-83 : 74

Genus Pseudostreptaxis Moellendorff, 1890

Pseudostreptaxis Möllendorff, 1890: 225; Schileyko 1998: 140.

Type species.

Helix (Aulacospira) Azpeitiae Hidalgo, 1890 by monotypy.

Diagnosis.

Shell globular, body whorl rounded or with smoothed peripheral angle, penultimate whorl rounded or narrowed or keeled (resulting in a streptaxoid shell shape); protoconch spirally striated, teleoconch with fine spiral striation and irregular growth wrinkles; aperture adnate to penultimate whorl, parietal callus weak, peristome almost discontinuous; apertural barriers 1-5; umbilicus narrow or relatively wide.

Remarks.

This genus has been monotypic so far. The type species, Pseudostreptaxis azpeitiae is characterized by a shell shape having distorted upper whorls reminiscent of those of Streptaxidae , and 4-5 apertural barriers. Pseudostreptaxis harli sp. n. differs conspicuously from P. azpeitiae by having a single parietal tooth and possessing a globular shell, but it often has a narrowed penultimate whorl similar to that of P. azpeitiae . Since the two species of Pseudostreptaxis differ considerably from each other, a modified diagnosis must be given. Due to the rounded body whorl this genus is treated as a full genus, as did to Schileyko (1998). Although this morphological difference might not seem to be sufficient for genus-level distinction, we rather use the most recent taxonomy.