Steromphala pennanti

Steromphala pennanti is a species of small sea snail, a marine gastropod mollusc in the family Trochidae, the top snails.[1]

Steromphala pennanti
A shell of Steromphala pennanti
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Vetigastropoda
Order: Trochida
Superfamily: Trochoidea
Family: Trochidae
Genus: Steromphala
Species:
S. pennanti
Binomial name
Steromphala pennanti
(Philippi, 1846)
Synonyms[1]
  • Gibbula pennanti (Philippi, 1846)
  • Glibbulastra umbilicata Monterosato
  • Trochus obliquatus Gmelin 1791
  • Trochus obliquatus var. paupercula Monterosato 1888
  • Trochus pennanti Philippi, 1846 (original description)
  • Trochus semiglobosus Aradas, 1847 (dubious synonym)
  • Trochus umbilicalis Forbes & Hanley

The species was named in honor of Thomas Pennant (1726 – 1798) was a Welsh naturalist.

Description

The size of the shell varies between 10 mm and 16 mm. The shell is more depressed than Gibbula cineraria, and (although the base is flatter) never inclined to a pyramidal form. The spiral ridges are sharper and fewer, especially in the young. The present species is usually more widely umbilicate and broader than Gibbula cineraria. The coloring is different; both have a similar kind of marking, but in the present species the longitudinal rays or streaks are red, besides being broader and not half so many as in the other species. And they are sometimes zigzag, instead of being broken into spots or interrupted by the sculpture. This species is striped, the other lineated. Just within the outer lip are two borders, one of yellow, the other of green variegated by red spots. This edging is minutely tubercled like shagreen.[2]

Distribution

This species occurs in the North Sea and off Spain.

References
  1. MolluscaBase eds. (2020). MolluscaBase. Steromphala pennanti (Philippi, 1846). Accessed through: World Register of Marine Species at: http://marinespecies.org/aphia.php?p=taxdetails&id=1039846 on 2020-12-30
  2. Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia (described as Gibbula obliquata)
  • Gmelin J. F., 1791: Caroli Linnaei systema Naturae per regna tria naturae. Editio decimatertia, aucta, reformata, Vermes Testacea ; Leipzig [Lipsiae] 1 (6): 3021-3910
  • Lowe, R. T. (1861). A list of shells observed or collected at Mogador and in its immediate environs, during a few days' visit to the place, in April 1859. Proceedings of the Zoological Society of London. 1860: 169-204 ["1860"]. London.
  • 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
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