- Source: Steromphala varia
Steromphala varia is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Description
The size of the shell varies between 8 mm and 15 mm. The solid, umbilicate shell has a conical shape. Its color is a dull, lusterless yellowish white or pinkish, with flexuous radiating cinereous or violaceous stripes below the suture. tTe entire surface is finely mottled and dotted with yellowish or violaceous and white. The short spire is conical, not acuminate as in Gibbula ardens and Gibbula umbilicaris. The about six whorls are flattened and separated by slightly impressed sutures. They are encircled by numerous fine striae. The body whorl is obtusely angular at the periphery. The large aperture is very oblique and is smooth within. The oblique columella is straightened. The umbilicus is funnel-shaped and whitish within.
This species is host to the ectoparasites Trochicola entericus Dollfus, 1914 and Lichomolgus trochi Canu, 1899
Distribution
This species occurs in the Mediterranean Sea and in the Atlantic Ocean off Portugal.
References
Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 180–213
External links
Samadi L. & Steiner G. (2010). "Conservation of ParaHox genes' function in patterning of the digestive tract of the marine gastropod Gibbula varia." BMC Developmental Biology 10:74. doi:10.1186/1471-213X-10-74.
Photo of trochophore (doi:10.1186/1471-213X-10-74 figure 2A).
"Gibbula varia". Gastropods.com. Retrieved 16 January 2019.
Linnaeus, C. (1758). Systema Naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Editio decima, reformata [10th revised edition], vol. 1: 824 pp. Laurentius Salvius: Holmiae
Risso A., 1826–1827: Histoire naturelle des principales productions de l'Europe Méridionale et particulièrement de celles des environs de Nice et des Alpes Maritimes; Paris, Levrault Vol. 1: XII + 448 + 1 carta [1826]. Vol. 2: VII + 482 + 8 pl. (fiori) [novembre 1827]. Vol. 3: XVI + 480 + 14 pl. (pesci) [septembre 1827]. Vol. 4: IV + 439 + 12 pl. (molluschi) [novembre 1826]. Vol. 5: VIII + 400 + 10 pl. (altri invertebrati)
Gmelin J. F., 1791: Caroli Linnaei systema Naturae per regna tria naturae. Editio decimatertia, aucta, reformata, Vermes Testacea; Leipzig [Lipsiae] 1 (6): 3021–3910 [molluschi].
Payraudeau B. C., 1826: Catalogue descriptif et méthodique des Annelides et des Mollusques de l'île de Corse; Paris pp. 218 + 8 pl.
Pallary P., 1906: Liste des Mollusques marins de la baie de Tripoli; Annales de la Société Linnéenne de Lyon 53: 203–213
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Monterosato T. A. (di), 1888–1889: Molluschi del Porto di Palermo. Specie e varietà; Bullettino della Società Malacologica Italiana, Pisa 13 (1888[1889?]): 161–180 14 (1889): 75–81
Affenzeller S., Haar N. & Steiner G. (2017). Revision of the genus complex Gibbula: an integrative approach to delineating the Eastern Mediterranean genera Gibbula Risso, 1826, Steromphala Gray, 1847, and Phorcus Risso, 1826 using DNA-barcoding and geometric morphometrics (Vetigastropoda, Trochoidea). Organisms Diversity & Evolution. 17(4): 789-812