Steromphala umbilicalis

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Steromphala umbilicalis
Gibbula umbilicalis 01.JPG
A shell of Steromphala umbilicalis
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Vetigastropoda
Order: Trochida
Superfamily: Trochoidea
Family: Trochidae
Subfamily: Cantharidinae
Genus: Steromphala
Species:
S. umbilicalis
Binomial name
Steromphala umbilicalis
(da Costa, 1778)
Synonyms [1]
  • Gibbula obliquata(Gmelin, 1791)
  • Gibbula obliquata var. gradataPallary, 1920
  • Gibbula umbilicalis(da Costa, 1778)
  • Trochus cinereusBlainville, 1826 non Linnaeus, 1758
  • Trochus obliquatusGmelin, 1791
  • Gibbula obliquata(Gmelin, 1791)
  • Trochus sarniensisNorman, 1888
  • Trochus umbilicalisda Costa, 1778 (original combination)
  • Trochus umbilicatusMontagu, 1803
  • Trochus umbilicatus var. atropurpureaJeffreys, 1865
  • Trochus umbilicatus var. decorataJeffreys, 1865

Steromphala umbilicalis, common name the flat top shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. [1]

Contents

Description

The size of an adult shell varies between 10 mm and 22 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 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. 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 marine species occurs in European waters and in the Mediterranean Sea off Morocco. It is found from the upper shore into the sublittoral on sheltered rocky shores and is tolerant of emersion and brackish waters.

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References

  1. 1 2 MolluscaBase eds. (2020). MolluscaBase. Steromphala umbilicalis (da Costa, 1778). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=1039850 on 2020-12-30
  2. ↑ Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
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