Hypselostoma depressispira ( van Benthem Jutting, 1949 ), 2025

Hypselostoma depressispira ( van Benthem Jutting, 1949) comb. nov.

Figs 242 C View Figure 242 , 252 View Figure 252 , 259 View Figure 259

Gyliotrachela depressispira van Benthem Jutting, 1949 b: 60 View in CoL , pl. 3.

Gyliotrachela depressispira View in CoL — van Benthem Jutting 1950: 27, 45, fig. 15; Berry 1963: 361; Maassen 2001: 75.

Type material examined.

Malaysia • 12 paratypes; Pahang, Bukit Chintamani ; ex. coll. Raffles Museum, Singapore; RMNH.Moll.137152 .

Additional material examined.

Malaysia • 2 shells; Pahang, 25 km northwest from Kuantan, north of Kampung Panching, Gua Charas , rock temple; 03°54.692'N, 103°08.839'E; 140 m a. s. l.; 24 Jan. 2013; A. Hunyadi leg.; coll. HA GoogleMaps • 28 shells; Kelantan, Gua Musang , vicinity of cave entrance; 04°52.974'N, 101°58.116'E; 135 m a. s. l.; 17 Jan. 2013; A. Hunyadi leg.; coll. HA GoogleMaps • 37 shells; Kelantan, Gua Musang, 6 km towards Pulai, Gua Madu , vicinity of cave, 04°50.213'N, 101°56.982'E; 120 m a. s. l.; 17 Jan. 2013; A. Hunyadi leg.; coll. HA GoogleMaps • 25 shells; Pahang, Gua Bama, Kuala Lipis 9 km, Padang Tungku ; 04°11.652'N, 101°57.936'E; 120 m a. s. l.; 19 Jan. 2013; A. Hunyadi leg.; coll. HA GoogleMaps • 201 shells; Pahang, Bukit Cinta Manis, south-southeastern side, Lebuhraya Karak 800 m towards Kampung Cinta Manis ; 03°26.714'N, 102°00.814'E; 22 Jan. 2013; A. Hunyadi leg.; coll. HA GoogleMaps • 3 shells; Pahang, Kota Gelanggi, Jengka-Jerantut road, on limestone surfaces covered with mosses; 03°53′28.55″N, 102°28′23.28″E; 29. May 2011; M. E. Marzuki leg.; coll. PGB GoogleMaps • 4 shells; Pahang, Gua Bama at Kp. Relong (~ 14 km N of Kuala Lipis); Oct. 1998; Hemmen leg; coll. PGB • 6 shells; Pahang, Gua Bama (~ 12 / 13 km N of Kuala Lipis); 04°11.643'N, 101°57.925'E; Nov. 2000; Hemmen leg; coll. PGB GoogleMaps .

Type locality.

“ Bukit Chintamani, Pahang ”, Malaysia.

Differential diagnosis.

This species bears some resemblance to the more depressed form of H. fortunatum sp. nov. However, H. depressispira has much more apertural barriers as well as separated angular and parietal lamellae. The last whorl is also more prominently keeled in H. depressispira and the umbilicus is slightly wider. See also under H. tubiferum .

Distribution.

This species is known from Peninsular Malaysia.

Remarks.

While examining the types, variability was observed in the smaller barriers. In some specimens, there were two and in others three interpalatal plicae. The number of lamellae between the columellar and parietal ranged between three and four. Number of barriers between lower palatal plica and columellar lamella ranged from two to three. Some specimens from Gua Musang (Kelantan) had only one barrier between the lower palatal and columellar and only one dot-like barrier between the columellar and parietal. Otherwise, the apertural barrier variability of other samples examined by us matches that of the type series.