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Tan S.K.,National University of Singapore | Ng H.E.,Beach Road and 02 80G | Nguang L.H.S.,VBox 888313
Raffles Bulletin of Zoology

A new cassid species of the genus Phalium Link, 1807 is described from material trawled in the Sunda Shelf. Phalium pseudobandatum, new species, is superficially close to P. bandatum (Perry, 1811) because of similarities in shell colour and markings. However, the new species can be separated from P. bandatum by conchological characteristics. The position of the posterior sinus in the new species is at or extends above the shoulder, accompanied by a low spire with a side profile that is smooth and not step-like. It also has a less rotund body whorl with a more angular shoulder compared to P. bandatum. A distinct groove on the parietal shield where it adjoins the body whorl is also present on shells of the new species. In addition, the thickened middle part of the outer lip is not seen in similarly sized specimens of P. bandatum. The siphonal canal of the new species is not pigmented, and the crenulations at the anterior edge of the outer lip are more numerous but less distinct than in P. bandatum. We also suggest that P. exaratum (Reeve, 1848) is a distinct Indian Ocean species rather than a geographical subspecies of P. bandatum. © National University of Singapore. Source

Tan S.K.,National University of Singapore | Chan S.Y.,VBox 888313 | Panha S.,Chulalongkorn University
Raffles Bulletin of Zoology

The arboreal land snail of the genus Amphidromus Albers, 1850, found in Singapore is often identified in the literature as Amphidromus atricallosus perakensis Fulton, 1901. Studies of A. atricallosus perakensis material from various localities in Peninsular Malaysia showed that the Singapore population is distinct. Results from earlier studies on molecular phylogeny and allozyme analyses also suggest genetic discontinuity from other A. atricallosus subspecies. The Singapore population is herein described as A. atricallosus temasek, new subspecies, and can be differentiated from A. atricallosus perakensis by several morphological characters. © National University of Singapore. Source

Chan S.Y.,VBox 888313 | Tan S.K.,National University of Singapore
Raffles Bulletin of Zoology

Two new species of arboreal camaenid snails in the subgenus Amphidromus (Syndromus) are described from the islands Sumba and Rotti, the Lesser Sunda Islands, Indonesia. Amphidromus (Syndromus) abbasi, new species, and Amphidromus (Syndromus) rottiensis, new species, can be differentiated from congeners in the same geographical region by shell characters. Morphologically similar species are compared, and the diagnostic differences mentioned. This work validates two previously-named nomina nuda. © National University of Singapore. Source

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