Luzonocoptis Pall-Gergely & Hunyadi

Pall-Gergely, Barna, Hunyadi, Andras & Asami, Takahiro, 2017, A new diplommatinid genus and two new species from the Philippines (Gastropoda, Caenogastropoda, Cyclophoroidea), ZooKeys 678, pp. 1-10 : 1

Genus Luzonocoptis Pall-Gergely & Hunyadi gen. n.

Diagnosis.

Shell sinistral; apex blunt, club-like; shell very slender with 14-18 whorls, rather regularly, finely ribbed; aperture round with a weak columellar lamella visible from standard apertural view; columellar lamella interrupted, its inner, short portion blunt thorn or tubercle-like, situated inside post-constriction bay; other inner plicae and lamellae absent; outer surface of operculum matt, smooth; inner surface with a very slightly elevated arcuate ridge; rachidian tooth with five cusps (central one blunt, larger than other four cusps), marginal teeth with four pointed cusps.

Differential diagnosis.

Luzonocoptis gen. n. differs from Palaina Semper, 1865 (type species: Diplommatina macgillivrayi Pfeiffer, 1854) by the unique shell shape, the strongly expanded peristome, and most importantly, the presence of a columellar tooth, which continues to a strongly developed lamella (see Yamazaki et al. 2013 and Neubert and Bouchet 2013). The most similar diplommatinid genus in terms of shell characters is Hungerfordia . Luzonocoptis gen. n. differs from Hungerfordia by the presence of an interrupted columellar lamella, and the rachidian tooth, which possess five well-developed cusps. In contrast, the columellar lamella of Hungerfordia is not interrupted, and the rachidian tooth is simpler, with a single, or three cusps.

Etymology.

The first part of the name derives from the name of the island (Luzon), where the included new species have been found. The second part ( “-coptis”) refers to the similarity with Middle American urocoptid taxa in terms of shell size, shape, colour and habitat. Gender feminine.

Type species.

Luzonocoptis antenna sp. n.

Content.

Luzonocoptis antenna sp. n. and L. angulata sp. n.

Distribution.

This genus is known so far from northeastern Luzon Island. The distance between the type localities of the two species is approximately 34 km in a straight line.