Article: Classification and Nomenclator of Gastropod Families. Add this to your Mendeley library Report an error. Summary; Details; MODS; BibTeX; RIS. About names at the rank of subtribe, tribe, subfamily, family and superfamily have been proposed for Recent and fossil gastropods. All these names are. Classification and Nomenclator of Gastropod Families. Philippe Bouchet, Jean- Pierre Rocroi · Page . Page 2. Page 3. Page 4. Page 5.
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In contrast, most of the previous overall taxonomic schemes for gastropods relied on morphological features to classify these animals, and used taxon ranks such as ordersuperorder and nomenclatr, which are typical of classifications that are still inspired by Linnaean taxonomy.
Contains the clades LittorinimorphaNeogastropoda and the informal group Ptenoglossa. Two other superfamilies are part of the clade Sigmurethra, but they are not in the limacoid clade:.
Here the information is displayed in the form of a cladogram an evolutionary tree of descent. Further research will eventually resolve these questions. The taxonomy of the Gastropoda as it was revised in by Philippe Bouchet and Jean-Pierre Rocroi is a system for the scientific classification of gastropod mollusks. Systems of classification such as this one are primarily of value to malacologists people who study mollusks and other biologists. It is worth bearing in mind however that this taxonomy is provisional: Subsequent revisions by other authors have been made since the publication of this paper.
This cladogram is based on the following information.
Bouchet and Rocroi use six main clades: The first three of these major clades have no nesting clades within them: This proposed classification has tried to integrate the results of recent molecular work by using unranked clades for taxa below the traditional rank of class class Gastropoda but above the rank of superfamily replacing the ranks subclass, superorder, order, and suborderwhile still using the traditional Linnaean ranks for superfamilies and all taxa below the rank of superfamily i.
The clades have been given names which are similar to, or in some cases the same as, traditional Linnaean names for taxa above the level of superfamily. Gastropods are a taxonomic class of animals which consists of snails and slugs of every kind, from the land, from freshwaterand from saltwater. The clades are unranked. In some parts of the taxonomy, instead of “clade”, Bouchet and Rocroi labelled groupings of taxa as a “group” or an “informal group”.
In the past, the taxonomy of gastropods was largely based on the morphological characters of the taxa, such as the shell characteristics including the protoconch in shelled species, and the internal anatomyincluding the structure of the radula and details of the reproductive system.
Classification and nomenclator of gastropod families.
Within the Caenogastropoda there is one extra clade. Classification of classificaion into subfamilies however is often not well resolved, and should be regarded as the best possible hypothesis. This system supersedes the system of Ponder and Lindberg from Both Linnaean taxa and clades are invalid if it turns out they are polyphyleticin other words if they consist of more than one lineage.
This shift in emphasis has meant that the newer taxa and their hierarchy are subject to debate, a debate that is not likely to be resolved soon. They have adopted again the common additional ranks above superfamily: Contains the subclades ElasmognathaOrthurethra and the informal classiication Sigmurethra. Whenever monophyly a single ancestry has not yet been tested and confirmed, or where a traditional taxon of gastropods has already been discovered to be paraphyletic that it excludes some of its descendants the term “group” or “informal group” has been used.
Biological classification schemes are not merely a convenience, they are an attempt to show the actual phylogeny the evolutionary relatedness within a group of organisms.
Gastropod taxonomy Systems of animal taxonomy Malacological literature. A full bibliographic reference is provided for each taxon, giving the name of the authority, the original publication, the date of that publication, the type genus for the taxon, its nomenclatural status, and its validity under the gastropof of the ICZN. The list format used below makes clear which taxa are informal groups rather than clades:.
The paper setting out this taxonomy was published in the journal Malacologia. Contains the Caenogastropoda of uncertain systematic position, the informal group Architaenioglossa and the clades Sorbeoconcha and Hypsogastropoda.
Classification and Nomenclator of Gastropod Families
Thus a taxonomy such as this one can be seen as an attempt to elucidate part of classificaiton tree of lifea phylogenetic tree. PatellogastropodaVetigastropodaCocculiniformiaNeritimorphaCaenogastropodaand Heterobranchia.
The system encompasses both living and extinct groups, as well as some fossils whose classification as gastropods is uncertain. Strong in Malacologia,61 1—2: The clade names are not indented, but their hierarchy is indicated by the size of the font used. Retrieved from ” https: Since the publication of this taxonomic system invarious changes have been published by other authors, for more information see changes in the taxonomy of gastropods since This page was last edited on 25 Julyat In the following, more cladsification list, indentation is used only for the ranks of superfamily and family.
Wikimedia Commons has media related to Template: In contrast, within the Heterobranchia, for some of the nudibranch groups there are six separate clades above the level of superfamily, and in the case of most of the land snailsthere are four clades above the level of superfamily. International Journal of Malacology. Since the publication of this taxonomic gasttopod invarious proposals for changes have been published by other authors, for more information see changes in the taxonomy of gastropods since A clearer sense of the hierarchy of the clades can be drawn from the list immediately above this one.
A clade must by definition contain only one lineage, and it was considered to be the classificztion that these “informal calssification may either contain more than one lineage, or only contain part of a lineage.
Contains the Palaeozoic Neritomorpha of uncertain position and the clades Cyrtoneritimorpha and Cycloneritimorpha. In this taxonomy valid gastropld are recognized.