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Wentletrap

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Wentletrap
A shell of Epitonium scalare
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Caenogastropoda

clade Hypsogastropoda

informal group Ptenoglossa
Superfamily:
Epitonioidea
Family:
Epitoniidae

Berry, 1910 (1812)[1]
Type genus
Epitonium
Diversity[2]
about 630 species
Synonyms[3]
  • Epitoniinae
  • Scalidae

Wentletraps are small, often white, very high-spired, predatory or ectoparasitic sea snails, marine gastropod mollusks in the family Epitoniidae.[3]

The word wentletrap originated in Dutch (wenteltrap), and it means spiral staircase. These snails are sometimes also called "staircase shells", and "ladder shells".

The Epitoniidae family belongs to the superfamily Epitonioidea, which also includes the Janthinidae (the pelagic purple snails) and the family Nystiellidae, all part of the informal group Ptenoglossa. Epitoniidae is a rather large family, with an estimated number of species about 630.[2]

Distribution

Wentletraps inhabit all seas and oceans worldwide, from the tropical zones to the Arctic and Antarctic zones.

Shell description

Most species of wentletrap are white, and have a porcelain-like appearance. They are notable for their intricately geometric shell architecture, and the shells of the larger species are prized by collectors.

The more or less turret-shaped shell consists of tightly-wound (sometimes loosely coiled), convex whorls, which create a high, conical spiral. Fine or microscopic spiral sculpture (also called "striae") is present in many species. The shells sometimes feature an umbilicus. Wentletrap shells have a roundish or oval aperture, but its inner lip is often reduced to strip of callus. The round and horny operculum is paucispiral and fits the aperture tightly. Most of the species in the family are small to minute, although some are larger, and overall the adult shell length in the family varies between 0.6 and 11.7 cm.[4]

Within the genus Epitonium, the type genus of the family, the shell has predominantly axial sculpture of high, sharply ribbed "costae". These costae may offer some protection against other predatory snails, which would find it difficult or impossible to bore a hole in a shell with such obstructions.

Ecology

Wentletraps are usually found on sandy bottoms near sea anemones or corals, which serve as a food source for them. Some species are foragers and search for anemones.

Little is known about the biology of most wentletraps. Many wentletraps reveal a hint of purple body color, suggestive of carnivorous feeding (Keen, 1958). The animal can exude through its salivary gland a pink or purplish dye that may have an anaesthetic effect on its prey.

Keen also cited direct observation of a wentletrap feeding by insertion of its proboscis into a sea anemone. A sequence of a wentletrap feeding on an anemone has been published.[5] These snails also prey on corals and other coelenterates.

Female wentletraps lay egg capsules that are bound together with a supple string. The young emerge from these capsules as free-swimming larvae.[5]

Genera

Genera within the family Epitoniidae include:[3]

Genera brought into synonymy [3]
  • Acrilla H. Adams, 1860: synonym of Amaea H. Adams & A. Adams, 1853
  • Acutiscala de Boury, 1909 : synonym of Epitonium Röding, 1798
  • Amiciscala Jousseaume 1912  : synonym of Epitonium Röding, 1798
  • Asperiscala de Boury, 1909: synonym of Epitonium Röding, 1798
  • Cinctiscala de Boury 1909  : synonym of Asperiscala de Boury, 1909
  • Cirratiscala de Boury, 1909  : synonym of Epitonium Röding, 1798
  • Clathroscala de Boury 1889  : synonym of Amaea H. Adams & A. Adams, 1853
  • Clathrus Oken 1815  : synonym of Epitonium Röding, 1798
  • Compressiscala Masahito (Prince) & Habe 1976 : synonym of Gregorioiscala Cossmann, 1912
  • Dannevigena Iredale 1936  : synonym of Cirsotrema Mörch, 1852
  • Foliaceiscala de Boury 1912  : synonym of Epitonium Röding, 1798
  • Fragiliscala Azuma 1962  : synonym of Amaea H. Adams & A. Adams, 1853
  • FragilopaliaAzuma 1972  : synonym of Amaea H. Adams & A. Adams, 1853
  • Glabriscala de Boury 1909  : synonym of Epitonium Röding, 1798
  • Lampropalia Kuroda & Ito, 1961  : synonym of Cylindriscala de Boury, 1909
  • Mazescala Iredale 1936  : synonym of Epitonium Röding, 1798
  • Nipponoscala Masahito (Prince) & Habe 1973  : synonym of Epitonium Röding, 1798
  • Nodiscala de Boury 1889 : synonym of Opalia H. Adams & A. Adams, 1853
  • Nystiella Clench & Turner, 1952  : synonym of Opaliopsis Thiele, 1928
  • Sagamiscala Masahito, Kuroda & Habe, 1971 : synonym of Globiscala de Boury, 1909
  • Scala Mörch, 1852 : synonym of Epitonium Röding, 1798
  • Scalina Conrad, 1865  : synonym of Amaea H. Adams & A. Adams, 1853
  • Spiniscala de Boury, 1909  : synonym of Epitonium Röding, 1798
  • Turbiniscala de Boury 1909  : synonym of Epitonium Röding, 1798
  • Viciniscala de Boury 1909  : synonym of Epitonium Röding, 1798

References

  1. ^ Berry S. S. (1910). "(Review of) Report on a collection of shells from Peru, with a summary of littoral marine Mollusca of the Peruvian zoological province. By William Healey Dall: Proc. U. S. N. M. 37, pp. 147-294, Pls. 20-28, 1909". The Nautilus 23(10): 130-132.
  2. ^ a b Art Weil (1999). "Conchologists of America List". University of Georgia. Retrieved 2009-03-23.
  3. ^ a b c d Gofas, S. (2010). Epitoniidae. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=132 on 24 April 2011
  4. ^ J. Wyatt Durham (1937). "Gastropods of the family Epitoniidae from mesozoid and Cenozoic rocks of the West Coast of North America". Journal of Paleontology. 11 (6): 479–512. JSTOR 1298354.
  5. ^ a b Collin, Rachel (2000). "Development and anatomy of Nitidiscala tincta (Carpenter, 1865) (Gastropoda: Epitoniidae)". The Veliger 43(4): 302-312.
  6. ^ "Conchologists of America List". University of Georgia. 1999. Retrieved 2009-03-23.

Further reading

Wikimedia Commons has media related to Epitoniidae.
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