Asthelys Explained

Asthelys is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae.

Description

The conical shell lacks axial riblets and a peripheral carina but has a punctate microsculpture. The midwhorl angulation is initially absent, but present on later whorls. The shell contains no spiral lirae. The U-shaped posterior sinus is shallow. The basal sinus is present, but there is no anterolateral sinus. The columella has no sinus or tooth. Tha aperture has a rhomboidal shape. There is no umbilical septum.

Radula

the rachidian tooth is broader than high and has lateral wings prominent. The lateral tooth cusp is broad. There are less than 10 marginal tooth pairs.^[1]

Species

Species within the genus Asthelys include:

• Asthelys antarctica Marshall, 1988
• Asthelys careyi Geiger, 2017
• Asthelys depressa Marshall, 1991
• Asthelys hyeresensis Hoffman, Gofas & Freiwald, 2020
• Asthelys munda (Watson, 1879)
• Asthelys nitidula Marshall, 1991
• Asthelys semiplicata Marshall, 1991
• Asthelys simplex (Watson, 1879)

References

• Marshall, B. A. (1988). New Seguenziidae (Mollusca: Gastropoda) from the Tasman, South Pacific, and Southern Antilles Basins. New Zealand Journal of Zoology 15: 235-247
• Marshall B.A. (1991). Mollusca Gastropoda : Seguenziidae from New Caledonia and the Loyalty Islands. In A. Crosnier & P. Bouchet (Eds) Résultats des campagnes Musorstom, vol. 7. Mémoires du Muséum National d'Histoire Naturelle, A, 150:41-109.

External links

• Quinn J. (1987). A revision of the Seguenziacea Verrill, 1884. II. The new genera Hadroconus, Rotellenzia, and Asthelys. Nautilus 101(2): 59-68

Notes and References

1. http://docserver.ingentaconnect.com/deliver/connect/umrsmas/00074977/v49n1/s49.pdf?expires=1369928888&id=74401970&titleid=10983&accname=Guest+User&checksum=8A1DBAA5A294BA597FCC6300E3EDAA2A James F. Quinn Jr., (1991), Systematic Position of Basilissopsis and Guttula, and a Discussion of the Phylogeny of the Seguenzioidea (Gastropoda: Prosobranchia), Bulletin of Marine Science, Volume 49, Numbers 1-2, September 1991, pp. 575-598(24)