New Helicostyla species (Bradybaenidae: Helicostylinae) from Patnanungan Island, Philippines
2015
De Chavez, E.R.C. | Fontanilla, I.K.C. | Batomalaque, G.A. | Chiba, S.
A new species of land snail, Helicostyla amagaensis de Chavez, belonging to Subfamily Helicostylinae, Family Bradybaenidae is described from native dipterocarp forest in Patnanungan Island, Polilio Group of Islands, Philipines. This new species differs from other congeners by its ovate-globose, cream white shell with single chestnut brown band. Aperture is ovate and moderately oblique with reddish-brown steak around the aperture outer lip. Penis is long with inner oblique striations terminating towards a leaf-like stimulator. Vas deferens is short and flagellum is absent. DNA barcoding techniques using Cytochrome c oxidase I subunit (COI) revealed H. amagaensis has closest sequence affinity with Helicostyla. This is the latest Helicostyla discovered in the Philippines and the third helicostyline snail that is endemic to the Polillo Group of Islands.
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