Pectinodontidae is a family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 of sea snail

Snail

Snail is a common name applied to most of the members of the molluscan class Gastropoda that have coiled shells in the adult stage. When the word is used in its most general sense, it includes sea snails, land snails and freshwater snails. The word snail without any qualifier is however more often...

s or true limpet

Limpet

Limpet is a common name for a number of different kinds of saltwater and freshwater snails ; it is applied to those snails that have a simple shell which is more or less conical in shape, and either is not spirally coiled, or appears not to be coiled in the adult snails.The name limpet is most...

s, marine

Marine (ocean)

Marine is an umbrella term. As an adjective it is usually applicable to things relating to the sea or ocean, such as marine biology, marine ecology and marine geology...

 gastropod mollusks in the clade

Clade

A clade is a group consisting of a species and all its descendants. In the terms of biological systematics, a clade is a single "branch" on the "tree of life". The idea that such a "natural group" of organisms should be grouped together and given a taxonomic name is central to biological...

 Patellogastropoda

Patellogastropoda

Patellogastropoda, common name true limpets and historically called Docoglossa, is a major phylogenetic group of marine gastropods, seen either as a clade or as a taxonomic order.-Taxonomy:Patellogastropoda was proposed by David R...

, the true limpets.

Taxonomy

This family was ranked as subfamily Pectinodontinae (also with Acmaeinae and Rhodopetalinae) in the family Acmeaidae in the taxonomy of the Gastropoda by Bouchet & Rocroi (2005)

Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005)

The taxonomy of the Gastropoda as it was revised by Philippe Bouchet and Jean-Pierre Rocroi is currently the most up-to-date overall system for classifying gastropod mollusks...

.

Nakano & Ozawa (2007) elevated Pectinodontinae to family level Pectinodontidae based on based on molecular phylogeny

Molecular phylogeny

Molecular phylogenetics is the analysis of hereditary molecular differences, mainly in DNA sequences, to gain information on an organism's evolutionary relationships. The result of a molecular phylogenetic analysis is expressed in a phylogenetic tree...

 research.

A cladogram

Cladogram

A cladogram is a diagram used in cladistics which shows ancestral relations between organisms, to represent the evolutionary tree of life. Although traditionally such cladograms were generated largely on the basis of morphological characters, DNA and RNA sequencing data and computational...

 showing phylogenic relations of Patellogastropoda:

Genera

Genera in the family Pectinodontidae include:

Pectinodonta

Pectinodonta

Pectinodonta is a genus of sea snails, the true limpets, marine gastropod mollusks in the family Pectinodontidae.-Species:Species within the genus Pectinodonta include:* Pectinodonta marinovichi Marshall, 1998...

- the earliest known Pectinodonta are from Late Oligocene

• Pectinodonta arcuata Dall, 1882 http://www.malacolog.org/wasp.php?mode=taxon&target=Acmaeidae
• Pectinodonta palaeoxylodia Lindberg & Hedegaard, 1996

Problacmaea

• Problacmaea apicina - cap limpet
• Problacmaea moskalevi
• Problacmaea rubella - reddish limpet
• Problacmaea sybaritica - lush limpet

Bathyacmaea

• Bathyacmaea secunda Okutani, Fujikura & Sasaki, 1993

Further reading

• Sasaki T., Okutani T. & Fujikura K. 2006. Anatomy of Bathyacmaea secunda Okutani, Fujikura & Sasaki, 1993 (Patellogastropoda: Acmaeidae). Journal of Molluscan Studies 2006 72(3):295-309; doi:10.1093/mollus/eyl007