Pseudostreptaxis is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Hypselostomatidae.MolluscaBase eds. (2026). MolluscaBase. Pseudostreptaxis Möllendorff, 1890. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=870136 on 2026-02-04
Description (Original description in Latin) The penultimate whorl is distinctly deviant (offset from the main axis), while the body whorl is not keeled but is instead rounded and smooth. The aperture is equipped with five teeth. The peristome is not continuous, featuring margins that converge toward one another rather than forming a complete ring.
(Description in 2019) The shell is globular in form, featuring a body whorl that is either rounded or marked by a smoothed peripheral angle. The penultimate whorl may be rounded, narrowed, or keeled, often resulting in a streptaxoid (asymmetrical or "twisted") shell shape. The protoconch is characterized by spiral striations, while the teleoconch exhibits a texture of fine spiral striae overlaid with irregular growth wrinkles.
The aperture remains adnate, being firmly attached to the penultimate whorl. The parietal callus is weak, and the peristome is nearly discontinuous. Depending on the specimen, the apertural barriers (internal teeth or lamellae) range in number from one to five. Finally, the umbilicus varies in width, appearing either narrow or relatively wide.Páll-Gergely, Barna, et al. "A review of Aulacospira Möllendorff, 1890 and Pseudostreptaxis Möllendorff, 1890 in the Philippines (Gastropoda, Pupilloidea, Hypselostomatidae)." ZooKeys 842 (2019): 67
Distribution These species are endemic to the Philippines. -
Species Pseudostreptaxis azpeitiae (Hidalgo, 1890) Pseudostreptaxis harli Páll-Gergely & Schilthuizen, 2019
References
Schileyko, A. A. (1998). Treatise on Recent terrestrial pulmonate molluscs. Part 2. Gastrocoptidae, Hypselostomatidae, Vertiginidae, Truncatellinidae, Pachnodidae, Enidae, Sagdidae. Ruthenica. Supplement 2: 129–261. Moskva