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Let me quote the description:" The body of the living animal, including rhinophores, oral tentacles, cerata and foot are predominantly a bluish gray color. Large, thick and somewhat dorso-ventrally flattened cerata cover the dorsum with smaller cerata at the lateral margins of the mantle. Large cerata are covered non-uniformly by round, nodulose tubercles that are also bluish gray in color. The tubercles tend to aggregate on, but are not exclusive to, the narrow margins and ends of the cerata, which terminate bluntly with a hardly visible tip."
It has zooxanthellae, it is like other members of the genus Phyllodesmium what Bill Rudman calls "Solar-powered Sea Slugs".
This species is as Phyllodesmium sp. 2 in IPN at page 385
Pretty similar are:
Phyllodesmium crypticum which differs by the very nodulose cerata, especially along their edges,
Phyllodesmium hyalinum which differs by the cerata, basically smooth, apically nodulose and curved.
This specimen was posted on 11 April 2012 at these websites as Phyllodesmium sp. 06 Genus: Ehrenberg, 1831,
I am pretty sure it is Phyllodesmium tuberculatum, though it has - compared to other specimens- only a few rounded tubercles, and its colour is not predominantly bluish grey
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426 pp.
Moore E. & Gosliner T. (2009). "Three new species of Phyllodesmium Ehrenberg (Gastropoda: Nudibranchia: Aeolidoidea), and a revised phylogenetic analysis".
Zootaxa 2201: 30–48.
This text is completely online at http://www.mapress.com/zootaxa/2009/f/zt02201p048.pdf
How to cite:
Köhler, E. (2020), published 15 January 2020, Phyllodesmium tuberculatum Moore & Gosliner, 2009
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Phyllodesmium_tuberculatum.htm