Tuns: Family Tonnidae

Tuns: Family Tonnidae

 

The tun shells or "tuns" are rare on S. Hutchinson Island. So far I've found one nearly complete Atlantic Partridge Tun, which is a rare shell (see below). The other tun shell I've found in broken form is the Giant Tun.


A rare Atlantic Partridge Tun, broken but easily identified (S. Hutchinson Island December, 2020.

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Tonnidae
From Wikipedia, the free encyclopedia

Scientific classification
Kingdom:     Animalia
Phylum:     Mollusca
Class:     Gastropoda
Subclass:     Caenogastropoda
Order:     Littorinimorpha
Superfamily:     Tonnoidea
Family:     Tonnidae
Suter, 1913 (1825)
Genera

See text
Synonyms[1]

    Doliidae Latreille, 1825
    Galeodoliidae Sacco, 1891
    Macgillivrayiidae H. Adams & A. Adams, 1854

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 (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.[2]


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.[3] 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.[4]

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

MolluscaBase eds. (2020). MolluscaBase. Rhytididae Pilsbry, 1893. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=816183 on 2020-10-22
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

External links
    Wikimedia Commons has media related to Tonnidae.


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