Ceratophyllidia is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of sea slugs, dorid nudibranch

Nudibranch

A nudibranch is a member of what is now a taxonomic clade, and what was previously a suborder, of soft-bodied, marine gastropod mollusks which shed their shell after their larval stage. They are noted for their often extraordinary colors and striking forms...

s, shell-less 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 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...

 Phyllidiidae

Phyllidiidae

Phyllidiidae is a family of sea slugs, dorid nudibranchs, marine gastropod mollusks in the superfamily Phyllidioidea.This family is within the clade Euctenidiacea .-Distribution:...

.

They are known for their unusually soft, spherical and stalked tubercules on their upper dorsum

Dorsum

Dorsum is a Latin word. In science, it could mean:* Dorsum , the posterior side of an animal* Dorsum , a term used in astrogeology for a ridge* Theta Capricorni, a star on the back of the Goat...

s. Unlike the species of Phyllidia, they lack oral glands or the glands are free from the oral tube.

Species

Species in the genus Ceratophyllidia include:

• Ceratophyllidia africana Eliot, 1903
• Ceratophyllidia papilligera
  Ceratophyllidia papilligera
  Ceratophyllidia papilligera is a species of sea slugs, dorid nudibranch, shell-less marine gastropod mollusc in the family Phyllidiidae.- External links :* http://www.seaslugforum.net/factsheet/cerapapi...
  
  (Bergh
  Rudolph Bergh
  Rudolph Bergh , full name Ludvig Sophus Rudolph Bergh, was a Danish physician and malacologist. He worked in Copenhagen....
  
  , 1890)

Further reading

• Brunckhorst D. J. (1993) "The systematics and phylogeny of phyllidiid nudibranchs (Doridoidea)". Records of the Australian Museum suppl. 16: 1-108.