• Source: Tonnidae

The Tonnidae are a family of medium-sized to very large sea snails, known as the tun shells. These are marine gastropod molluscs in the clade Littorinimorpha. The name tun refers to the snails' shell shape, which resembles wine casks known as "tuns". While thin, the shells are also strong and lack opercula. They are found in all tropical seas, where they inhabit sandy areas. During the day, they bury themselves in the substrate, emerging at night to feed on echinoderms (especially sea cucumbers), crustaceans, and bivalves. Some larger species also capture fish, using their expandable probosces to swallow them whole. Females lay rows of eggs that become free-swimming larvae for several months before settling to the bottom.




Taxonomy


In 2005, these subfamilies were recognized in the taxonomy of Bouchet & Rocroi:

Cassinae Latreille, 1825
Oocorythinae P. Fischer, 1885
Phaliinae Beu, 1981
Tonninae Suter, 1913
Bouchet & Rocroi (2005) listed Cassidae as a synonym of Tonnidae Suter, 1913 (1825), following Riedel (1995) in this. However, later Beu (2008: 272) separated the two families. This is in agreement with the action of Thiele (1925) who placed Tonnidae and Cassidae under "Tonnacea", therefore acting as first reviser under ICZN article 24. In this respect, the World Register of Marine Species follows the opinion of Beu.




Genera


Genera and species within the family Tonnidae include:
The subfamily Cassinae has been raised to the rank of family Cassidae

Eudolium Dall, 1889
Malea Vallenciennes, 1832
Tonna Brunnich, 1771
Genera brought into synonymy

Cadium Link, 1807 : synonym of Tonna Brunnich, 1771
Cadus Röding, 1798 : synonym of Tonna Brunnich, 1771
Cassidaria Link, 1807 : synonym of Eudolium Dall, 1889
Doliopsis di Monterosato, 1872 (non Vogt, 1852; non Conrad, 1865) : synonym of Eudolium Dall, 1889
Foratidolium Rovereto, 1899: synonym of Tonna Brünnich, 1771
Macgillivrayia Forbes, 1852 : synonym of Tonna Brünnich, 1771
Dolium Lamarck, 1801: synonym of Tonna Brunnich, 1771
Parvitonna Iredale, 1931: synonym of Tonna Brunnich, 1771
Perdix Montfort, 1810: synonym of Tonna Brunnich, 1771
Quimalea Iredale, 1929: synonym of Malea Valenciennes, 1832




Further reading


Vaught, K.C. (1989). A classification of the living Mollusca. American Malacologists: Melbourne, FL (USA). ISBN 0-915826-22-4. XII, 195 pp.




References






External links



Checklist of Mollusca
Paleodb

Kata Kunci Pencarian:

• Malakologi
• Tonnidae
• Tun
• Varix (mollusc)
• List of marine molluscs of Sri Lanka
• Tonna sulcosa
• Tonna (gastropod)
• Tonnoidea
• List of British Rail Class 47 locomotives
• Tonna canaliculata
• Eudolium crosseanum