Euthyneura (Veludiscus)

Pall-Gergely, Barna, Hunyadi, Andras, Ablett, Jonathan, Lương, Hao Văn, Fred Naggs, & Asami, Takahiro, 2015, Systematics of the family Plectopylidae in Vietnam with additional information on Chinese taxa (Gastropoda, Pulmonata, Stylommatophora), ZooKeys 473, pp. 1-118 : 41-42

Taxon classification Animalia Stylommatophora Plectopylidae

Subgenus Veludiscus Pall-Gergely subgen. n.

Type species.

Gudeodiscus eroessi Páll-Gergely & Hunyadi, 2013.

Diagnosis.

Shell indistinguishable from those of the subgenus Gudeodiscus (Gudeodiscus) and the genus Halongella gen. n. Anatomy: Epiphallus is slender, cylindrical; retractor muscle inserts on the distal end of the penial caecum, but the whole caecum is covered by additional, fine muscle fibres which insert on the distal end of the penis. Radula: central tooth smaller than the ectocone of the first lateral; mesocone of the first lateral is usually wide, rhomboid. Marginals bi- or tricuspid, with blunt inner cusp and shallow incision between the inner two cusps. See drawings and descriptions of the genital anatomy in Páll-Gergely and Hunyadi (2013) and Páll-Gergely and Asami (2014).

Content.

emigrans ( Möllendorff, 1901), eroessi Páll-Gergely & Hunyadi, 2013, goliath Páll-Gergely & Hunyadi, 2013(?), okuboi Páll-Gergely & Hunyadi, 2013, pulvinaris (Gould, 1859).

Etymology.

The name Veludiscus is composed of two Latin words. Velum (=curtain, sail, covering) refers to the characteristic feature of the genitalia, namely the additional curtain-like muscle covering the penial caecum and the retractor muscle, and discus (=disc) refers to the shape of the shell. The genus is gender masculine.

Remarks.

Some conchologically similar species may belong to this subgenus, especially those which inhabit similar geographic regions. Future investigations on the anatomy and radula morphology of Gudeodiscus species should clarify the subgeneric status of the taxa with unknown anatomy.