Perrottetia phuphamanensis Siriboon & Panha

Siriboon, Thanit, Sutcharit, Chirasak, Naggs, Fred & Panha, Somsak, 2013, Three new species of the carnivorous snail genus Perrottetia Kobelt, 1905 from Thailand (Pulmonata, Streptaxidae), ZooKeys 287, pp. 41-57 : 49-51

Perrottetia phuphamanensis Siriboon & Panha sp. n. Figs 3 I–KTable 1

Type material.

Holotype CUMZ 5011 (Fig. 3I). Measurement: shell height 5.0 mm, shell width 6.9 mm, and with 6¼ whorls. Paratypes NHMUK 20130066 (2 shells), SMF 341488 (2 shells), CUMZ 5012 (14 shells).

Other material examined.

Tam Kangkao, Phuphaman, Khonkaen: CUMZ 5013.

Type locality.

Phuphaman National Park, Phuphaman, Khonkaen, Thailand, 16°45'34.0"N, 101°57'50.3"E.

Diagnosis.

Perrottetia concinna (Blanford, 1880) differs from Perrottetia phuphamanensis sp. n. in its smaller shell, higher spire and more distinct suture. The left periphery of the penultimate whorl does not extend beyond the diameter of the last whorl, the aperture is semi-ovate, and a bifid columellar lamella is present. Perrottetia peroteti differs from this new species in its fine transverse ridge at the suture, the smaller second parietal lamella, and the absence of the upper palatal and supracolumellar lamellae.

Perrottetia gudei can be distinguished from Perrottetia phuphamanensis sp. n. by its lower spire, a stronger transverse ridge at the suture, its triangular aperture, the second parietal lamella not being adjacent to the first parietal lamella and the absence of a supra columellar lamella. Distinguishing features from Perrottetia aquilonaria sp. n.are the smaller shell and the presence of a sinulus. In addition, the left periphery of the penultimate whorl does not extend beyond the diameter of the last whorl, the peristome is thin ner, the second parietal lamella is not adjacent to the first parietal lamella, and a bifid columellar and supracolumellar lamellae are both absent.

Description.

Shell suboblique-heliciform, white and translucent; whorls 6¼, spire convex, suture distinct; shell surface glossy, with a reduced transverse ridge; embryonic shell large consisting of about 2½ whorls, with smooth surface; following whorls regularly expanding; shell periphery shouldered, last whorl axially deflected; two shallow and short longitudinal furrows present; umbilicus narrow (Fig. 3I); aperture subcircular, peristome discontinuous, very thick and slightly expanded; apertural dentition with a large first parietal lamella and with a second parietal lamella adjoining at right angles; one upper palatal lamella, one palatal lamella, one basal lamella, one large strong columellar lamella, one small supracolumellar lamella (sometimes absent) (Fig. 3K).

Etymology.

The specific epithet is derived from the type locality of this new species, the Phuphaman National Park, Khonkaen Province.

Distribution.

This species is known only from the type locality.

Remark.

To date no living examples have been found.