Caenogastropoda
Various examples of Caenogastropoda
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
(unranked):	clade Caenogastropoda Cox, 1960
Taxonomy
See text

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. This clade is the Monotocardia as defined by Mörch in 1865, but revised and unranked.

Caenogastropoda contains the great majority of the families of shelled marine molluscs including such families as the periwinkles, cowries, wentletraps and cone snails.

Contents 1 Biology 2 Taxonomy 3 References 4 External links

[edit] Biology

The Caenogastropoda exhibit torsion and thus are included in what was previously been called the Streptoneura (meaning twisted nerves), also known as Prosobranchia (meaning gills forward). Specifically they are characterized by having only a single auricle in the heart and a single pair a leaflets^[ambiguous] in the ctenidium (gills) and are equivalent to the Monotocardia or Pectinobranchia of older authors.

Caenogastropoda can be divided into two major groups based on the anatomy of the radula:

• Taenioglossa (from taenio meaning band) which are the older Mesogastropoda in which there are typically seven teeth in each radular row.
• Stenoglossa (from steno meaning narrow), the Neogastropoda, in which there are only 1-3 teeth per row.

[edit] Taxonomy

According to the older Ponder & Lindberg taxonomy, Caenogastropoda was ranked as superorder. In the more recent taxonomy of Bouchet & Rocroi, Caenogastropoda has become one of the main clades of gastropods, containing :

• sub-taxa of uncertain position
• informal group Architaenioglossa
• clade Sorbeoconcha
• clade Hypsogastropoda

[edit] References

[edit] External links

Wikispecies has information related to: Caenogastropoda

• Caenogastropoda taxonomy at NCBI.