Perrottetia hongthinhae

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Perrottetia hongthinhae is a small air-breathing land snail in the family Streptaxidae. The species is named in honor of Nguyen Thi Hong Thinh, the wife of malacologist Do Duc Sang. The holotype is kept at the Vietnam National Museum of Nature in Hanoi, and paratypes are in the Museum of Biology, Hanoi National University of Education.

Distribution and habitat
This snail is only known from its type locality in limestone forests of Nam Loong Commune, Lai Châu City, Lai Châu Province, Vietnam, at about 1,226 meters above sea level.

Shell and appearance
- Shape: oblique-heliciform (slanted coil)
- Color: white and translucent
- Size: about 5.6–5.8 mm wide, 3.2–3.3 mm tall
- Whorls: six; embryonic shell has ~2.5 whorls; body whorl is axially deflected
- Spire: weakly convex; apical angle 21.3–24.8 degrees
- Surface: glossy with shallow transverse ridges on the upper surface
- Aperture: rectangular with rounded angles; peristome is thickened and expanded
- Dentition (inside the opening): one very large parietal lamella, one palatal lamella, one large basal lamella, one strong columellar lamella, and one small supracolumellar lamella
- Other features: the umbilicus (the central hole) is wide and shallow

Holotype details
No live specimens had been found at the time of description (2017).

Comparison with related species
- Perrottetia dugasti: differs by having a single parietal lamella (instead of multiple) and a stronger basal lamella.
- Perrottetia messageri: smaller shell, weaker transverse ridges, and a differently expanded body whorl.
- Vietnamese congeners (P. aberrata, P. daedalus, P. gudei, P. mabillei, P. simonianus): generally larger or differently shaped shells with distinct base profiles.
- Perrottetia unidentata: smoother shell, smaller size, and a rectangular aperture with rounded angles.

Diet
Species in the genus Perrottetia are carnivorous.