Cypraeidae

Cypraeidae
A live Talparia talpa in situ with its mantle almost fully extended, anterior end towards the right
Shells of a number of species of cowries
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Littorinimorpha
Superfamily: Cypraeoidea
Family: Cypraeidae
Rafinesque, 1815
Type genus
Pseudomelatoma
Dall, 1918
Genera

See text

Synonyms[1]
  • Cypraeovulinae Schilder, 1927· accepted, alternate representation
  • Erroneinae Schilder, 1927· accepted, alternate representation
  • Luriinae Schilder, 1932· accepted, alternate representation
  • Pustulariinae Gill, 1871· accepted, alternate representation

Cypraeidae, commonly named the cowries (sg. cowry), is a taxonomic family of small to large sea snails. These are marine gastropod mollusks in the superfamily Cypraeoidea, the cowries and cowry allies. [1]

Shell description

Cypraeidae have adult shells which are very rounded, almost like an egg; they do not look like a typical gastropod shell. Their glossy, polished, ovate-shaped shells have beautiful patterns in a variety of colors. These patterns, combined with minor variations in shell form, have led some conchologists to recognize 60 genera and hundreds of species and subspecies.

In virtually all of the species in the family Cypraeidae, the shells are extremely smooth and shiny. This is because in the living animal, the shell is nearly always fully covered with the mantle.

The upper surface is typically convex, while the ventral side is flattened. Typically, no spire is visible in the fully adult shell. There is a long, narrow, aperture that runs along the length of the ventral side. The aperture is lined with "teeth".

Juvenile cowry shells are not at all similar to adult cowry shells. The juvenile shells of cowries perhaps more closely resemble the shells of some "bubble snails" in the order Cephalaspidea. Also the shells of juvenile cowries seldom exhibit the same color patterns as the adult shells do, and thus can be hard to identify to species.

Cowries have no operculum.

Distribution

The Cypraeidae constitute one of the most widely distributed groups of gastropods in tropical and subtropical seas. The cowries are one of the most abundant and diversified groups of shells to be found on reefs and rocky intertidal flats and sandy substrates in the island area.

Predators and prey

The very narrow toothed aperture of the cowry shell makes the adult shells difficult for many predators to reach into. However cowries are still vulnerable to predation:[2]

  • Some tropical crustaceans can break the dorsum of a cowry shell.
  • Some mollusc-eating cones, such as Conus textile, can inject venom into the cowry's flesh. The cone then extends its stomach into the shell, through the aperture, to completely ingest the flesh.
  • Some octopuses can gouge a small hole (using a special barb/tooth and an acidic secretion) through the shell to inject a venom that kills the animal within.

The eating habits of cowries are poorly known, because most species are nocturnal and cryptic, but sponges are the most commonly described prey. Off the coasts of Australia, common cowry species eat sponges,[2] and on Caribbean coral reefs they are known to eat sponges that are otherwise chemically defended against other predators.[3]

Taxonomy

For nearly 200 years, every species in the family Cypraeidae was placed in one genus, Cypraea, but in 2002 [4] the cowries were divided into many different genera.

2005 taxonomy

The family Cypraeidae belongs, together with the family Ovulidae, to the superfamily Cypraeoidea. This, in turn, is part of the clade Littorinimorpha which belongs within the clade Hypsogastropoda according to the taxonomy of Bouchet & Rocroi (2005).

The following six subfamilies have been recognized in the taxonomy of Bouchet & Rocroi (2005) but are treated as alternate representation of Cypraeidae in the World Register of Marine Species :

  • Cypraeinae Rafinesque, 1815
    • tribe Cypraeini Rafinesque, 1815 - synonym: Porcellanidae Roberts, 1870 (inv.)
    • tribe Mauritiini Steadman & Cotton, 1946
  • Erosariinae Schilder, 1924 - synonyms: Cypraeacitinae Schilder, 1930 (inv.); Nariinae Schilder, 1932; Staphylaeinae Iredale, 1935
  • Erroneinae Schilder, 1927
    • tribe Erroneini Schilder, 1927 - synonym: Adustinae Steadman & Cotton, 1946
    • tribe Bistolidini C. Meyer, 2003
  • Gisortiinae Schilder, 1927 - synonyms: Archicypraeinae Schilder, 1930; Bernayinae Schilder, 1927; Cpraeorbini Schilder, 1927; Mandolininae Schilder, 1932; Umbiliini Schilder 1932; Zoilinae Iredale, 1935
  • Luriinae Schilder, 1932
  • Pustulariinae Gill, 1871
    • tribe Pustulariini Gill, 1871
    • tribe Cypraeovulini Schilder, 1927
  • Zonariinae F. A. Schilder, 1932
    • Tribe Pseudozonariini Lopez Soriano, 2006
    • tribe Zonariini Schilder, 1932

Genera

Genera within the family Cypraeidae include:

Apertural view of a shell of Nucleolaria granulata
Neobernaya spadicea
Notocypraea piperita
Eclogavena quadrimaculata thielei

Species

For a list of Species in the taxonomic family Cypraeidae, see Cowries.

References

  1. ^ a b "WoRMS - World Register of Marine Species - Cypraeidae Rafinesque, 1815".
  2. ^ a b Wilson, Barry; Clarkson, Peter (2004). Australia's Spectacular Cowries. El Cajon, CA, USA: Odyssey. ISBN 0966172027.
  3. ^ Pawlik, JR; Deignan, Lindsey (2015). "Cowries graze verongid sponges on Caribbean reefs". Coral Reefs. 34 (2): 663. Bibcode:2015CorRe..34..663P. doi:10.1007/s00338-015-1279-x.
  4. ^ Lorenz F. 2002. New Worldwide Cowries. Descriptions of new taxa and revisions of selected groups of living Cypraeidae (Mollusca: Gastropoda). Schriften zur Malakozoologie aus dem Haus der Natur-Cismar 20: 1-292, pl. 1-40
  5. ^ Cypraeinae Rafinesque, 1815. Retrieved through: World Register of Marine Species on 6 January 2019.
  6. ^ Erosariinae Schilder, 1924. Retrieved through: World Register of Marine Species on 6 January 2019.
  7. ^ a b c d e Meyer C. P. (2003) "Molecular systematics of cowries (Gastropoda: Cypraeidae) and diversification patterns in the tropics". Biological Journal of the Linnean Society 79(3): 401–459. doi:10.1046/j.1095-8312.2003.00197.x
  8. ^ Erroneinae Schilder, 1927. Retrieved through: World Register of Marine Species on 6 January 2019.
  9. ^ Gisortiinae Schilder, 1927 †. Retrieved through: World Register of Marine Species on 6 January 2019.
  10. ^ Luriinae Schilder, 1932. Retrieved through: World Register of Marine Species on 6 January 2019.
  11. ^ Pustulariinae Gill, 1871. Retrieved through: World Register of Marine Species on 6 January 2019.
  12. ^ Umbiliinae Schilder, 1932. Retrieved through: World Register of Marine Species on 6 January 2019.

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