Kingdom Animalia Class Gastropoda Family Helicarionidae | Phylum Mollusca Superfamily Helicarionoidea Rank Genus | |
Thapsia garganica
Thapsia is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Helicarionidae. Species in this genus are found in tropical western Africa, from Senegal to Gabon.
Contents
Thapsia villosa
Description
Species attributed to the genus Thapsia sensu lato have shell diameters ranging from about 15 to 30 mm, with 5½-6½ whorls. These rather featureless dextral shells are characterized by a low spire and their yellow to brown color. The spiral sculpture of the postembryonic shell is slender. In some larger species the sculpture of the radial ribs is formed crosswise (like the letter X) or beadlike. The foot shows a long caudal horn.
Species
Thapsia was originally designated in 1860 by German zoologist Johann Christian Albers as a subgenus of Nanina Gray, 1834, non Risso, 1826.
This genus is a heterogeneous assemblage. Because the shell characters of this genus converge with those of the larger specimens of some closely related genera (Saphtia Winter, 2008, Pseudosaphtia Winter, 2008 and Vanmolia Winter, 2008), the delimitation of species to Thapsia s.l. is difficult. There very few papers that describe the anatomical features of this genus.
Thapsia contains the following species: