Molecular Biology and Genetics
Statistics of barcoding coverage
Specimens with Sequences:8
Specimens with Barcodes:8
Species With Barcodes:5
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 the shells are thin, they are also strong. There is no operculum. 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, 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.
In 2005, these subfamilies were recognized in the taxonomy of Bouchet & Rocroi:
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 and species within the family Tonnidae include:
The subfamily Cassinae has been raised to the rank of family Cassidae
- 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
- 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
- Rehder, Harold A., 1981, National Audubon Society Field Guide to Shells, pg. 503
- Beu A. G. (2008). "Recent deep-water Cassidae of the world. A revision of Galeodea, Oocorys, Sconsia, Echinophoria and related taxa, with new genera and species (Mollusca, Gastropoda)". In: Héros V., Cowie R. H. & Bouchet P. (eds). "Tropical Deep-Sea Benthos 25". Mémoires du Muséum National d'Histoire Naturelle 196: 269-387. abstract in French.
- Gofas, S. (2011). Cassidae. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=22999 on 2011-02-23
- Vaught, K.C. (1989). A classification of the living Mollusca. American Malacologists: Melbourne, FL (USA). ISBN 0-915826-22-4. XII, 195 pp
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