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Wentletrap

Wentletraps are small, often white, very high-spired, predatory or ectoparasitic sea snails, marine gastropod mollusks in the family Epitoniidae. The family Epitoniidae belongs to the superfamily Epitonioidea. Since 2017 this family also includes the former families Janthinidae (the pelagic purple snails) and Nystiellidae, all part of the informal group Ptenoglossa. Epitoniidae is a rather large family, with an estimated number of species about 630.

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

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 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.

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. Keen (1958) is most often cited. He observed that many wentletraps reveal a hint of purple body color, suggestive of carnivorous feeding. 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. 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.

Genera

Genera within the family Epitoniidae include:

Synonyms

  • Acrilla <small>H. Adams, 1860</small>: synonym of Amaea <small>H. Adams & A. Adams, 1853</small>
  • Acutiscala de Boury, 1909 : synonym of Epitonium Röding, 1798
  • Amiciscala <small> Jousseaume 1912 </small> : synonym of Epitonium Röding, 1798
  • Asperiscala <small>de Boury, 1909</small>: synonym of Epitonium <small>Röding, 1798</small>
  • Cinctiscala<small> de Boury 1909 </small> : synonym of Asperiscala de Boury, 1909
  • Cirratiscala <small> de Boury, 1909 </small> : synonym of Epitonium Röding, 1798
  • Clathroscala <small> de Boury 1889 </small> : synonym of Amaea H. Adams & A. Adams, 1853
  • Clathrus <small> Oken 1815 </small> : synonym of Epitonium Röding, 1798
  • Compressiscala<small> Masahito (Prince) & Habe 1976 </small>: synonym of Gregorioiscala <small>Cossmann, 1912</small>
  • Dannevigena <small> Iredale 1936 </small> : synonym of Cirsotrema Mörch, 1852
  • Depressiscala <small> de Boury 1909 </small>: synonym of Epitonium <small>Röding, 1798</small>
  • Foliaceiscala<small> de Boury 1912 </small> : synonym of Epitonium Röding, 1798
  • Fragiliscala <small> Azuma 1962 </small> : synonym of Amaea H. Adams & A. Adams, 1853
  • Fragilopalia<small>Azuma 1972 </small> : synonym of Amaea H. Adams & A. Adams, 1853
  • Glabriscala<small> de Boury 1909 </small> : synonym of Epitonium Röding, 1798
  • Lampropalia <small>Kuroda & Ito, 1961 </small> : synonym of Cylindriscala de Boury, 1909
  • Mazescala <small> Iredale 1936 </small> : synonym of Epitonium Röding, 1798
  • Nipponoscala <small>Masahito (Prince) & Habe 1973 </small> : synonym of Epitonium Röding, 1798
  • Nodiscala<small> de Boury 1889 </small>: synonym of Opalia <small>H. Adams & A. Adams, 1853</small>
  • Nystiella <small>Clench & Turner, 1952 </small> : synonym of Opaliopsis Thiele, 1928
  • Plastiscala <small> Iredale, 1936 </small>: synonym of Acirsa <small>Mörch, 1857</small> (junior subjective synonym)
  • Problitora <small> Iredale, 1931 </small>: synonym of Alexania <small>Strand, 1928</small> (uncertain synonym)
  • Sagamiscala <small> Masahito, Kuroda & Habe, 1971 </small>: synonym of Globiscala <small>de Boury, 1909</small>
  • Scala Mörch, 1852 : synonym of Epitonium Röding, 1798
  • Scalina<small> Conrad, 1865 </small> : synonym of Amaea H. Adams & A. Adams, 1853
  • Spiniscala <small> de Boury, 1909 </small> : synonym of Epitonium Röding, 1798
  • Turbiniscala<small> de Boury 1909 </small> : synonym of Epitonium Röding, 1798
  • Viciniscala<small> de Boury 1909 </small> : synonym of Epitonium Röding, 1798

References

Further reading

  • A. Weil, L. Brown and B. Neville, 1999, The Wentletrap Book: A Guide to the Recent Epitoniidae of the World, Mal de Mer Enterprises
  • Manuella Folly & Silvio Felipe & Silvio Lima, Records and Descriptions of Epitoniidae (Orthogastropoda: Epitonioidea) from the Deep Sea off Northeastern Brazil and a Checklist of Epitonium and Opalia from the Atlantic Coast of South America; International Journal of Zoology Volume 2012, Article ID 394381, 12 pages

External links