Perrottetia aquilonaria Siriboon & Panha, 2013

Inkhavilay, Khamla, Siriboon, Thanit, Sutcharit, Chirasak, Rowson, Ben & Panha, Somsak, 2016, The first revision of the carnivorous land snail family Streptaxidae in Laos, with description of three new species (Pulmonata, Stylommatophora, Streptaxidae), ZooKeys 589, pp. 23-53 : 35-36

Taxon classification Animalia Pulmonata Streptaxidae

Perrottetia aquilonaria Siriboon & Panha, 2013 Figs 1, 5E

Perrottetia aquilonaria Siriboon et al. 2013: 50-52, figs 3 D–H, 4 D–F: Type locality: Wat Tam Pha Plong, Chiangdao, Chiangmai, Thailand.

Material examined.

Holotype CUMZ 5003, paratypes CUMZ 5004 (4 shells). Ban Namone, Xayabouly, Laos: CUMZ 6278 (2 shells; Fig. 5E), CUMZ 6279 (1 specimen in ethanol). Ban Bo Khoun, Boun Neua, Phongsaly, Laos: CUMZ 6280 (1 shell).

Remarks.

Perrottetia aquilonaria was described from several localities in the northern part of Thailand with a complete information on shell, radula and genitalia. The specimens collected from limestone outcrops in Borkeo and Phongsaly of Laos have both shells and genitalia that match very well with this species. Laos specimens seem to differ only in the slightly smaller shell, therefore we treated them as the same species.

Perrottetia aquilonaria can be distinguished from Perrottetia dugasti and Perrottetia messageri from Vietnam by having a depressed spire, shouldered last whorl, thin parietal callus and upper-parietal lamella separated at a right angle. In contrast, Perrottetia dugasti has a rounded last whorl and a small upper-parietal lamella located deeper inside the aperture, and Perrottetia messageri has paralleled parietal lamellae, a small supercolumellar lamella is present, and the left side of the penultimate whorl extended beyond the diameter of the last whorl (Fig. 5A, D).