''Phyllidia haegeli'' 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 ...

, a dorid nudibranch, a shell-less

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 ...

mollusk 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 e ...

in the family

Phyllidiidae Phyllidiidae is a family of sea slugs, dorid nudibranchs, marine gastropod mollusks in the superfamily Phyllidioidea. This family is within the clade Doridacea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). Distributi ...

Distribution

This species was described from Trawangan slope reef, Gili Trawangan, Lombok,

Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine ...

. It also occurs in

Bali Bali () is a province of Indonesia and the westernmost of the Lesser Sunda Islands. East of Java and west of Lombok, the province includes the island of Bali and a few smaller neighbouring islands, notably Nusa Penida, Nusa Lembongan, and Nu ...

and Anilao in the

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

.Siers, S. (2009)
''Phyllidia haegeli''
(as ''Phyllidia varicosa''), Nudipixel, accessed 2016-11-18

Description

This nudibranch has a blue background to the dorsum, becoming darker at the margin. It has a pattern of four longitudinal black lines on the dorsum separating three ridges with tall yellow-capped tubercles surrounded by pale blue. At the edge of the mantle there are vertical lines of smaller tubercles with darker centres with broken black lines between them. The rhinophores are yellow. It is similar in appearance to '' Phyllidia coelestis'', ''

Phyllidia varicosa ''Phyllidia varicosa'' is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Phyllidiidae.Bouchet, P. (2015)''Phyllidia varicosa'' Lamarck, 1801.In: MolluscaBase (2015). Accessed through: World Regis ...

'' and ''

Phyllidia picta ''Phyllidia picta'' is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Phyllidiidae.Rosenberg, G.; Bouchet, P. (2015)''Phyllidia picta'' Pruvot-Fol, 1957.In: MolluscaBase (2015). Accessed through: W ...

''.

Diet

This species feeds on a sponge.

References

{{Taxonbar, from=Q14094422 Phyllidiidae Gastropods described in 2000