Halistylus pupoideus

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Halistylus pupoideus
Halistylus pupoides 001.jpg
Drawing of a shell of Halistylus pupoideus
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Vetigastropoda
Order: Trochida
Superfamily: Trochoidea
Family: Trochidae
Genus: Halistylus
Species:
H. pupoideus
Binomial name
Halistylus pupoideus
(Carpenter, 1864)
Synonyms [1]
  • Fenella pupoideaCarpenter, 1864
  • Halistylus pupoides (misspelling)

Halistylus pupoideus is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. [1] [2]

Contents

This species has been misspelled Halistylus pupoides in the 19th century literature. [3]

Description

The shell grows to a length of 6 mm. This species occurs invariably with Caecum crebricinctum Carpenter, 1864. Both species have the same variantions in color. The very small shell is high-spired with a cylindrical shape. Its color varies between yellow to reddish-brown with some dark axial streaks. The slightly convex whorls are smooth, but show, under magnification, numerous, very fine spiral threads. This species shows great variations in strength and spacing of the spiral cords with, in some specimens, the major cords more prominent than normal. As typical for this genus, there is no umbilicus. The subcircular aperture has a pearly appearance. It shows a rounded, thickened lip. [4]

Distribution

This species occurs in the Pacific Ocean from Alaska to Panama. It is seldom found off California, but rather plentiful off British Columbia.

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References

  1. 1 2 Bouchet, P.; Rosenberg, G. (2012). Halistylus pupoideus (Carpenter, 1864). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=528714 on 2012-11-23
  2. ↑ Turgeon, D.D., et al. 1998. Common and scientific names of aquatic invertebrates of the United States and Canada. American Fisheries Society Special Publication 26
  3. ↑ Biodiversity library : Halistylus pupoides
  4. ↑ H.A. Rehder, Field Guide to North American Seashells, ISBN   0-394-51913-2
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