Caenogastropoda
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| Caenogastropoda | ||||||||
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 Various examples of Caenogastropoda
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The clade Caenogastropoda, first established by Cox in 1960, comprise a large diverse group of mostly marine gastropods. This group combines the older taxa Mesogastropoda and Neogastropoda of prevous taxonomies. This clade is the Monotocardia as defined by March in 1863, but revised and reranked.
The Caenogastropoda includes the great majority of the families of shelled marine mollusca (89 families in all), for example, the periwinkles, cowries and whelks.
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[edit] Biology
The Caenogastropoda are among the gastropods that exhibit torsion and thus are included in what has previously been called the Streptoneura (twisted nerves), a.k.a Prosobranchia (gills forward). Specifically they are characterized by having only a single auricle in the heart and a single pair a leaflets in the ctenidium (gills) and are equivalent to the Monotocardia or Pectinobranchia of older authors.
Caenogastropods can be divided into two major groups based on the anatomy of the radula. First are the Taenioglossa (Taenio. band) which are the older Mesogastropoda in which there are typically seven teeth in each radular row. Second are the Stenoglossa (steno, narrow), the Neogastropoda, in which there are only 1-3 teeth per row.
[edit] Taxonomy
According to older taxonomy of the Gastropoda (Ponder & Lindberg, 1997) Caenogastropoda was ranked as superorder. In the more recent Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005)#Clade Caenogastropoda., Caenogastropoda has become one of the main clades of gastropods, containing :
- Caenogastropoda of uncertain systematic position
- informal group Architaenioglossa
- clade Sorbeoconcha
- clade Hypsogastropoda
[edit] References
[edit] External links
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Wikispecies has information related to: Caenogastropoda |
