Caenogastropoda is a taxonomic subclass of molluscs in the class Gastropoda. It is a large diverse group which are mostly and other marine gastropod mollusc, but also includes some and some . The subclass is the most diverse and ecologically successful of the gastropods.
Caenogastropoda contains many families of gastropod shell marine molluscs – including the periwinkles, cowries, , moon snails, Muricidae, and – and constitutes about 60% of all living gastropods.[.]
Biology
The Caenogastropoda exhibit torsion, and thus are included in what was previously 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 of gill leaflets, and are equivalent to the Monotocardia or Pectinibranchia of older authors.
Taxonomy
The
taxon Caenogastropoda was first established by Leslie Reginald Cox in 1960 as a superorder
[ Caenogastropoda, Paleobiology] but now sometimes it is retained as a
clade. Based on optimal phylogenetic analysis, it is deemed
monophyletic.
This Caenogastropoda combines the older taxa
Mesogastropoda and
Stenoglossa from the classification by Johannes Thiele
and is equivalent to the revised Monotocardia as defined by Mörch in 1865.
Caenogastropoda can be divided into two major groups, based on the anatomy of the radula:
1997 taxonomy
Ponder & Lindberg, 1997 and others since (e.g. Vega et al., 2006;
[F. J. Vega et al. 2006. El Espinal, a new plattenkalk facies locality from the Lower Cretaceous Sierra Madre Formation, Chiapas, southeastern Mexico. Revista Mexicana de Ciencias Geológicas 23(3):323-333] Harzhauser, 2004;
[Harzhauser M. (2004). "Oligocene gastropod faunas for the Eastern Mediterranean (Mesohellenic Trough/Greece and Esfahan-Sirjan Basin/Central Iran)". Courier Forschungsinstitut Senckenberg 248: 93–181.] and Pina, 2002.
[ A.Pina -Caenogastropoda]) show Caenogastropoda as a superorder, following the sense of Cox, 1960. More recently Bouchet & Rocroi, 2005 revised Caenogastropoda as a clade.
2005 taxonomy
The following classification was laid out in the taxonomy of Bouchet & Rocroi (2005):
2006 taxonomy
Colgan et al. (2006)
provided further insight into the phylogeny of Caenogastropoda.
Latest views by the World Register of Marine Species
Sorbeoconcha should include Cerithioidea, see definition in Ponder & Lindberg, 1997: 225, not only Cerithioidea as suggested by the indent pattern in Bouchet & Rocroi. Neotaenioglossa Haller, 1892 suggested in Ruud Bank's draft for Fauna Europaea is not retained because it would need severe emendation to remove Pyramidellids, Cerithioids, etc. included in its original definition, and therefore would be too far from Haller's concept if it were to fit the concept of Sorbeoconcha. Although cladistically sound, the taxon Sorbeoconcha is skipped in the classification scheme because (1) ten years after its publication, the name still sounds unfamiliar to most and (2) it is not very helpful in the classification because it includes the bulk of Caenogastropoda (only keeping out small stem groups
Abyssochrysidae,
Provannidae, and the architaenioglossate taxa). This is not final, opinions are welcome.
[Gofas, S. (2013). Sorbeoconcha. Accessed through: World Register of Marine Species on 2013-06-28]
External links
