Zemacies marginalis

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Zemacies marginalis
Zemacies marginalis 001.jpg
Original image of a shell of Zemacies marginalis
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Neogastropoda
Superfamily: Conoidea
Family: Borsoniidae
Genus: Zemacies
Species:
Z. marginalis
Binomial name
Zemacies marginalis
(P. Marshall, 1919)
Synonyms [1]
  • Surcula equispiralisMarshall, 1919
  • Surcula hampdenensisMarshall, 1920
  • Surcula marginalisMarshall, 1919

Zemacies marginalis is an extinct species of sea snail, a marine gastropod mollusk in the family Borsoniidae. [1]

Contents

Description

(Original description from a single, imperfect specimen) Seven whorls remain on the spire, and there is a protoconch of three whorls. In the first six whorls there are eighteen tubercles on the keel, but the body whorl is smooth. Sutures are prominently bordered in front. All portions of the whorl have prominent spiral striations, including the tubercles. As shown by the growth lines the anal sinus is moderately sharp, but less so than in Zemacies hamiltoni (Hutton, 1905).

This species is closely related to Zemacies hamiltoni, but differs from it in having the prominent border of the suture, more numerous tubercles, and a much more abundant spiral ornamentation both above and below the keel. [2]

Distribution

This extinct marine species is endemic to New Zealand and was found in Middle Eocene strata.

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References

  1. 1 2 Marshall, B. (2015). Zemacies marginalis. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=831527 on 2016-04-10
  2. ↑ Marshall (1918), Fauna of the Hampden Beds; Transactions and proceedings of the New Zealand Institute, vol. 51, p. 231, pl. 17, fig. 10


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