Diloma zelandicum

Diloma zelandicum is a species of sea snail, a marine gastropod mollusc in the family Trochidae, the top snails or top shells.[1]

Diloma zelandicum
Diloma zelandicum
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Vetigastropoda
Order: Trochida
Superfamily: Trochoidea
Family: Trochidae
Genus: Diloma
Species:
D. zelandicum
Binomial name
Diloma zelandicum
(Quoy and Gaimard, 1834)
Synonyms
  • Diloma (Fractarmilla) zelandica (Quoy, H.E.T. & J.P. Gaimard, 1834)
  • Monodonta atrovirens Suter, 1913
  • Monodonta melanoloma guttata Hutton, 1884
  • Monodonta morio Suter, 1913
  • Trochus atrovirens Philippi, 1851
  • Trochus zelandicus Quoy and Gaimard, 1834 (basionym)

Description

The height of the shell attains 20 mm, its diameter 25 mm. The imperforate shell is depressed and has an orbiculate-conoidal shape. The six whorls are separated by impressed sutures. The whorls are slightly convex, greenish-black and shining. They are spirally sulcate, the sulci about 5 on the penultimate whorl. The body whorl is much dilated, slightly depressed above, rounded in the middle, very obliquely striate, obsoletely transversely sulcate, slightly convex beneath. The aperture is subrhomboidal and lirate within. The acute lip is green. The basal margin is thickened within. The white columella is compressed and arcuate. The columellar callus is broadly expanded, subdepressed at the place of the umbilicus.[2]

Distribution

This marine species is endemic to New Zealand and occurs off North Island, South Island and Stewart Island. It has also been reported from Tasmania.

References
  1. Bouchet, P. (2010). Diloma zelandicum(Quoy & Gaimard, 1834). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=546852 on 2011-07-03
  2. Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia (described as Monodonta atrovirens)
  • Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1
  • Spencer H.G., Marshall B.A. & Waters J.M. (2009) Systematics and phylogeny of a new cryptic species of Diloma Philippi (Mollusca: Gastropoda: Trochidae) from a novel habitat, the bull kelp holdfast communities of southern New Zealand. Invertebrate Systematics 23: 19–25.
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