Phyllidia coelestis

Phyllidia coelestis is a species of sea slug, a nudibranch, a shell-less marine gastropod mollusc in the family Phyllidiidae.[1][2]

Phyllidia coelestis
at Bunaken, North Sulawesi
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Order: Nudibranchia
Suborder: Doridina
Superfamily: Phyllidioidea
Family: Phyllidiidae
Genus: Phyllidia
Species:
P. coelestis
Binomial name
Phyllidia coelestis
Bergh, 1905[1]
Synonyms[1]

Phyllidia alia Yonow, 1984

Distribution and habitat

This species occurs in the tropical Indo/West-Pacific. It lives on the external slope of coral reefs, on top of the reef and in the lagoon, also down to 30 m in depth. Found in the western Pacific Ocean, South China Sea, Timor Sea and across the Indian Ocean to South Africa.

Description

This sea slug is up to 6 cm in length. The body is elongated and slug-shaped. The mantle has a grey-blue background color; the margin is covered with many small tubercles. Bigger tubercles that are yellow capped, run along the median line.

There are also three black longitudinal lines. Two of them are on each side of the mantle, and one on a median line ending on the anterior part as a "Y". This particular line shape constitutes a distinctive element to identify this species.

In this species the rhinophores possess lamellae, and are yellow in color.

Behaviour

This species is benthic and diurnal. Because of its aposematic colors, it is able to crawl around in the daylight to feed. Phyllidia coelestis has a diet based on sponges.

References
  1. Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O, eds. (2022). "Phyllidia coelestis". MolluscaBase. World Register of Marine Species. Retrieved 27 February 2022.
  2. Brunckhorst, David J. (1993). "The systematics and phylogeny of phyllidiid nudibranchs (Doridoidea)". Records of the Australian Museum. Supplement. 16: 1–107. doi:10.3853/j.0812-7387.16.1993.79.
  • P.L. Beesley, G.J.B. Ross & A. Wells,"Mollusca-The southern synthesis", vol.5, CSIRO, 1998, ISBN 0-643-05756-0
  • David Behrens, "Nudibranch behaviour", Newworld Publication INC., 2005, ISBN 978-1878348418
  • Gary Cobb & Richard Willan, "Undersea jewels- a colour guide to nudibranchs", Australian Biological Resources Study, 2006, ISBN 0642568472
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