Nacellidae is a taxonomic 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 molluscs 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...

.

Nacellidae is the only family in the superfamily Nacelloidea. This family has no subfamilies.

Taxonomy

The following is 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 the phylogenic relationships of the Patellogastropoda, 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 by Nakano & Ozawa (2007):

Genera

Genera within the family Nacellidae include:

• Cellana
  Cellana
  Cellana is a genus of sea snails or limpets, marine gastropod molluscs in the family Patellidae, the true limpets. -Distribution:This genus occurs in the temperate and tropical Indo-Pacific oceans, Hawaii and around Australia and New Zealand...
  
  H. Adams, 1869
• Macklintockia Gould, 1846 - with one species Macklintockia scabra
  Macklintockia scabra
  Macklintockia scabra, common name the California rough limpet, is a species of small sea snail or limpet, a marine gastropod mollusc in the family Nacellidae, the true limpets....
  
  (Gould, 1846)
• Nacella
  Nacella
  Nacella is a southern, cold-water genus of true limpets, marine gastropod molluscs in the family Patellidae, the true limpets.These limpets are found in the littoral zone and sublittoral zone of Antarctic and sub-Antarctic waters including...
  
  Schumacher, 1817 - type genus
• Naccula Iredale, 1924