The yellow-tipped nudibranch, ''Caloria'' sp. 2, as designated by Gosliner, 1987, is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

sea slug Sea slug is a common name for some marine invertebrates with varying levels of resemblance to terrestrial slugs. Most creatures known as sea slugs are gastropods, i.e. they are sea snails (marine gastropod mollusks) that over evolutionary t ...

, specifically an aeolid nudibranch, a

marine Marine is an adjective meaning of or pertaining to the sea or ocean. Marine or marines may refer to: Ocean * Maritime (disambiguation) * Marine art * Marine biology * Marine debris * Marine habitats * Marine life * Marine pollution Military * ...

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusc Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is esti ...

in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Facelinidae The Facelinidae are a Taxonomy (biology), taxonomic family (biology), family of colorful sea slugs. These are specifically aeolid nudibranchs. They are marine (ocean), marine gastropod molluscs.Bouchet, P. (2012). Facelinidae. Accessed through: W ...

Distribution

This species is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

to the

South African __NOTOC__ South African may relate to: * The nation of South Africa * South African Airways * South African English * South African people * Languages of South Africa * Southern Africa Southern Africa is the southernmost subregion of the Afric ...

coast and is found only on the Atlantic coast of the

Cape Peninsula The Cape Peninsula ( af, Kaapse Skiereiland) is a generally mountainous peninsula that juts out into the Atlantic Ocean at the south-western extremity of the African continent. At the southern end of the peninsula are Cape Point and the Cape of ...

in 10–30 m of water. As at November 2009, it remained undescribed by science.

Description

The yellow-tipped nudibranch grows to 30 mm in total length. It is a slender pale-bodied aeolid with numerous lavender cerata with yellow tips. Its head bears perfoliate orange rhinophores and a pair of oral tentacles which have an orange band in their midsection.Zsilavecz, G. 2007. ''Nudibranchs of the Cape Peninsula and False Bay''.

Ecology

This aeolid feeds on hydroids. In common with other aeolid nudibranchs, the cerata of black-dot nudibranch aid in respiration but also contain extensions of the digestive system. The nudibranch eats the hydroid and passes its

nematocyst A cnidocyte (also known as a cnidoblast or nematocyte) is an explosive cell containing one large secretory organelle called a cnidocyst (also known as a cnida () or nematocyst) that can deliver a sting to other organisms. The presence of this ce ...

s unharmed through its digestive system to the tips of its cerata. Here the nematocysts mature and are then used by the nudibranch for its own defence. It is probable that the bright colours of the black-dot nudibranch serve to advertise to predators that it is toxic.

References

Facelinidae Undescribed gastropod species {{Facelinidae-stub