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Pyrgocythara helena

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This is an old revision of this page, as edited by William Avery Bot (talk | contribs) at 23:33, 11 April 2018 (Removing Category:Molluscs described in 1919 and adding Category: Gastropods described in 1919. See BRFA). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Pyrgocythara helena
Original image of a shell of Pyrgocythara helena
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Neogastropoda
Superfamily: Conoidea
Family: Mangeliidae
Genus: Pyrgocythara
Species:
P. helena
Binomial name
Pyrgocythara helena
(Dall, 1919)
Synonyms[1]
  • Philbertia helena Dall, 1919

Pyrgocythara helena is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.[1]

Description

The length of the shell attains 3.5 mm, its diameter 1.25 mm.

(Original description) The minute, solid shell is pale yellowish brown. It is strongly sculptured. The protoconch of about two whorls is low and rapidly increasing. The last one is keeled, otherwise smiooth. . The four subsequent whorls show a deeply constricted, not appressed suture. The axial sculpture consists of (on the body whorl seven) strong ribs. These are angulated at the periphery, with subequal deep interspaces, and which are not continuous up the spire. The spiral sculpture consists of on the upper whorl one, on the third two, on the body whorl about seven obscure rounded rather coarse threads with narrower interspaces. The aperture is narrow. The anal sulcus is shallow close to the suture. The outer lip is varicose and smooth within. The inner lip is smooth. The columella is short and straight. The siphonal canal is not differentiated from the aperture.[2]

Distribution

This marine species occurs in the Sea of Cortez, Western Mexico and off Costa Rica .

References

  1. ^ a b Pyrgocythara helena (Dall, 1919). Retrieved through: World Register of Marine Species on 11 August 2011.
  2. ^ Dall (1919) Descriptions of new species of Mollusca from the North Pacific Ocean; Proceedings of the U.S. National Museum, vol. 56 (1920) Public Domain This article incorporates text from this source, which is in the public domain.
  • Tucker, J.K. (2004). "Catalog of recent and fossil turrids (Mollusca: Gastropoda)" (PDF). Zootaxa. 682: 1–1295.
  • Gastropods.com: Pyrgocythara helena

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