Phorcus punctulatus

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Phorcus punctulatus
Phorcus punctulatus 001.jpg
Drawing with two views of a shell of Phorcus punctulatus
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Vetigastropoda
Order: Trochida
Superfamily: Trochoidea
Family: Trochidae
Genus: Phorcus
Species:
P. punctulatus
Binomial name
Phorcus punctulatus
(Lamarck, 1822)
Synonyms [1]
  • Monodonta osilinDeshayes in Lamarck
  • Monodonta punctulataLamarck, 1822 (original description)
  • Osilinus punctulatus(Lamarck, 1822)
  • Trochus punctulatusPhilippi

Phorcus punctulatus, common name the punctate monodont, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. [1] [2]

Contents

Description

The size of the shell varies between 15 mm and 20 mm. The solid, imperforate shell has a conical shape. It is, deep purplish-brown or blackish, dotted with white, the dots sometimes forming spiral series, and always elongated in the direction of the spiral. The surface is nearly smooth, sometimes showing traces of spiral grooves, which are always visible on the young. The spire is conoid. The apex is generally eroded and orange-colored. The 6 whorls are convex. The body whorl is somewhat flattened or subconcave around the upper part. The base of the shell is convex, eroded and white in front of the aperture. The aperture is half-circular. The outer lip is not much thickened, edged with black, beautifully iridescent within, with amethystine tints. The columella is short, obtusely subdentate at the base, expanding above into a callus, which covers the axis and the umbilicus, or leaves a slight excavation or groove. [3]

Distribution

This species occurs in the Atlantic Ocean off Senegal and Gambia.

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References

  1. 1 2 Gofas, S. (2012). Phorcus punctulatus (Lamarck, 1822). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=689177 on 2012-11-23
  2. ↑ Donald K.M., Preston J., Williams S.T., Reid D.R., Winter D., Alvarez R., Buge B., Hawkins S.J., Templado J. & Spencer H.G. 2012. Phylogenetic relationships elucidate colonization patterns in the intertidal grazers Osilinus Philippi, 1847 and Phorcus Risso, 1826 (Gastropoda: Trochidae) in the northeastern Atlantic Ocean and Mediterranean Sea. Molecular Phylogenetics and Evolution, 62(1): 35–45
  3. ↑ Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia (described as Monodonta punctulata)
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