Neogastropoda
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The Neogastropoda was, for many years, an order of sea snails, marine gastropod mollusks. In the current version of gastropod taxonomy however, Neogastropoda is an infraorder of sea snails.
When Neogastropoda was an order, it was within the prosobranch gastropods according to the taxonomy developed by Thiele (1921). The families which used to form the order Neogastropoda are now included in the infraorder Neogastropoda Cox, 1960.
A more detailed account of discussion on the taxonomy of the gastropods is given in Gastropoda, Archaeogastropoda and Mesogastropoda.
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[edit] Description
The Neogastropoda are a fairly recent group of marine snails. The first specimens are found in layers of the Late Cretaceous, about 70 million years ago.
They only have one auricle, one kidney and one monopectinate gill, i.e. the gill filaments develop on only one side of the central axis.
The shell has a well-developed siphonal canal. The elongated trunk-like siphon is an extensible tube, formed from a fold in the mantle. It is used to suck water into the mantle cavity. At the base of the siphon is the bipectinate (branching from a central axis) osphradium, a sensory receptacle and olfactory organ, that is more developed than the one in the Mesogastropoda.
The nervous system is very concentrated. Many species have the ganglia in a compact space.
The rachiglossate (rasp-like) radula, a layer of serially arranged teeth within the mouth, have only three denticles (small teeth) in each transverse row.
The Neogastropoda have separate sexes.
There are about 16,000 species. Neogastropoda includes many well-known gastropods including the cone snails, conchs, mud snails, olive snails, oyster drills, tulip shells, and whelks. The Neogastropoda all live in the sea, except Clea, a rare freshwater genus. They are mostly predators, some are saprophagous (scavengers).
[edit] Superfamilies in the infraorder Neogastropoda
- Superfamily Cancellarioidea Forbes & Hanley, 1851
- Superfamily Conoidea Fleming, 1822
- Superfamily Buccinoidea Rafinesque, 1815
- Superfamily Muricoidea Rafinesque, 1815
- Superfamily Olivoidea Latreille, 1825
- Superfamily Pseudolivoidea (de Gregorio, 1880)
[edit] Families in the infraorder Neogastropoda
- Babylonidae Kuroda, Habe & Oyama, 1971
- Buccinidae Rafinesque, 1815
- Buccinulidae (downgraded to the rank of tribe Buccinini Rafinesque, 1815 )
- Cancellariidae Forbes and Hanley, 1851
- Clavatulidae Gray, 1853
- Colubrariidae Dall, 1904
- Columbariidae (downgraded to the rank of subfamily Columbariinae Tomlin, 1928 in the family Turbinellidae)
- Columbellidae Swainson, 1840
- Conidae Fleming, 1822
- Costellariidae MacDonald, 1860
- Cystiscidae Stimpson, 1865
- Drilliidae Olsson, 1964
- Fasciolariidae Gray, 1853
- Harpidae Bronn, 1849
- † Johnwyattiidae Serna, 1979
- Magilidae Thiele, 1925
- Marginellidae Fleming, 1828
- Melongenidae Gill, 1871 (1854)
- Mitridae Swainson, 1829
- Muricidae Rafinesque, 1815
- Nassariidae Iredale, 1916 (1835)
- Olivellidae Troschel, 1869
- Olividae Latreille, 1825
- † Perissityidae Popenoe & Saul, 1987
- † Pholidotomidae Cossmann, 1896
- Pleioptygmatidae Quinn, 1989
- Pseudolividae de Gregorio, 1880
- Pseudomelatomidae Morrison, 1965
- Ptychatractidae Stimpson, 1865
- † Sarganidae Stephenson, 1923
- † Speightiidae Powell, 1942
- Strepsiduridae Cossmann, 1901
- Strictispiridae McLean, 1971
- † Taiomidae Finlay & Marwick, 1937
- Terebridae Mörch, 1852
- Turbinellidae Swainson, 1835
- Turridae H. and A. Adams, 1853
- Vasidae H. and A. Adams, 1854
- Volutidae Rafinesque, 1815
- Volutomitridae Gray, 1854
- † Weeksiidae Sohl, 1961
[edit] References
- Neogastropoda (TSN 73228). Integrated Taxonomic Information System.
- Bouchet, Philippe & Jean-Pierre Rocroi 2005. Classification and Nomenclator of Gastropod Families. Malacologia 47(1-2): 1-397.
- Ponder, WF & DR Lindberg 1997. Towards a phylogeny of gastropod molluscs: an analysis using morphological characters. Zool. J. Linn. Soc. 119(2): 83-265.
- Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1
