Volutharpa ampullacea

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Volutharpa ampullacea
Volutharpa ampullacea (MNHN-IM-2000-6498).jpeg
Shell of Volutharpa ampullacea (syntype at MNHN, Paris)
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Neogastropoda
Superfamily: Buccinoidea
Family: Buccinidae
Genus: Volutharpa
Species:
V. ampullacea
Binomial name
Volutharpa ampullacea
(Middendorff, 1848)
Synonyms [1]
  • Buccinum (Volutharpa) ampullaceum(Middendorff, 1848) superseded combination
  • Buccinum ampullaceum(Middendorff, 1848)
  • Bullia ampullaceaMiddendorff, 1848 (original combination)
  • Tritonium (Volutharpa) ampullacea(Middendorff, 1848) superseded combination
  • Volutharpa deshayesianaP. Fischer, 1856 ·

Volutharpa ampullacea is a species of sea snail, a marine gastropod mollusk in the family Buccinidae, the true whelks. [1]

Contents

Subspecies

Description

The length of the shell varies between 30 mm and 61.7 mm.

The shell is reddish brown under a rufous or yellowish epidermis.

G.W. Tryon notes the following:

With regard to the Volutharpa ampulacea, a very remarkable fact may be mentioned. The majority of the individuals are without opercula, even without a trace of the pad-like gland or area from which the operculum is secreted. About ten per cent,of the individuals of the var. acuminata which I have examined had traces of this gland or area, marked by its smooth and rather whitish surface on the granulous dark slate-colored foot. About fifteen per cent, had well developed opercula in the proper position. I have ascertained the same to be the case with regard to the typical form, from alcoholic specimens, collected by Dr. William Stimpson in Behring's Strait. There is no mistake about this, strange as it may and must appear, that different individuals of the same species are indifferently operculate or inoperculate. A careful examination of this appendage reveals some singularities in it worthy of note. At first the operculum is of an ovoid form, with the nucleus near the edge at the larger end, and increases by additions around the edge, but principally upon the smaller or upper end. However, at some late period of its growth it takes a new start, and, seemingly, a new operculum is commenced underneath the old one, with a central nucleus which increases by annular additions, and finally has its edges very much thickened and turned upward, giving it a saucer-like appearance, while the old operculum seems as if laying upon the saucer, with its nucleus and some of the adjacent portion projecting over the edge anteriorly. It has in all a diameter of .1 inch. That its form is not due to an individual abnormality is evident from the fact that all the specimens examined were similar.

[2]

Distribution

This species is confined in distribution to the North Pacific Ocean, mainly off Japan, the North Yellow Sea, the Bering Strait and Alaska.

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References

  1. 1 2 MolluscaBase eds. (2023). MolluscaBase. Volutharpa ampullacea (Middendorff, 1848). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=491383 on 2023-07-04
  2. ↑ G.W. Tryon (1880-1881) Manual of Conchology III, Academy of natural Sciences, Philadelphia PD-icon.svg This article incorporates text from this source, which is in the public domain .


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