Oophana tiomanensis, Clements, 2006

Clements, Reuben, 2006, Oophana Tiomanensis, A New Streptaxid (Gastropoda: Pulmonata: Streptaxidae) From Pulau Tioman, Peninsular Malaysia, Raffles Bulletin of Zoology 54 (1), pp. 125-127 : 126

Oophana tiomanensis , new species

( Figs. 1-2 )

Materials examined. – Holotype - 1 ex. (Height 10.4 mm; Width 11.4 mm; Height of aperture 6.0 mm) ( ZRC.MOL.90), beneath leaf litter on soil, 50 m elevation, Gunung Kajang (2º 46'N 104º 9'E), Pulau Tioman, Peninsular Malaysia, coll. R. Clements, 18 Aug.2003.

Paratypes – 2 ex. (11.8 mm; 11.4 mm; 6.9 mm) ( ZRC.MOL.91) and (10.9 mm; 11.4 mm; 5.4 mm) ( ZRC.MOL.92), same locality data as holotype .

Diagnosis. – Shell obliquely ovoid, white or cream coloured, about opaque, with 6-7 whorls. Spire moderately rounded; penultimate whorl more convex on left side; last whorl protruding to the right side, moderately rounded, slightly angular just below the periphery. First 21 / 2 whorls smooth; other whorls sculptured with low, rounded collabral ribs; those on early whorls closely packed, about 8-12 to the mm; those on last whorl furthest apart, about 4 to the mm, continuing into the umbilicus. Suture distinct but not deep.Apex rounded. Base relatively inflated. Umbilicus about 1 mm wide. Aperture oblique, semi-elliptic. Peristome continuous, reflected, thickened, glossy, whitish or yellowish-brown. Parietal side with distinct, slightly undulating lamella continuing 4-5 mm into the aperture. Palatal, basal and columellar side each with single, distinct, knob-shaped tooth. All teeth arranged in cross-shaped manner. Animal with orange-reddish body and tentacles. Foot yellowish.

Etymology. – The species name is derived from the type locality, Pulau [= Island] Tioman.

differs from this new species by having the penultimate whorl carinate to the left, while O. bulbulus ( Morelet, 1862) differs by being larger (height - 15 mm) and distinctly less oblique.

Distribution. – Gunung Kajang, Pulau Tioman, Peninsular Malaysia (present study).

Figures

Fig. 1. Live animal of Oophana tiomanensis, new species, from Pulau Tioman, Peninsular Malaysia. The body and tentacles are orange-red while the foot is yellow. Photo: H. H. Tan.

Fig. 2. Shell of Oophana tiomanensis, new species. Holotype (ZRC.MOL.83) from side, top and bottom.