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Sclerodoris apiculata (Alder & Hancock, 1864) [Doris]

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Sclerodoris apiculata is characterized by a dull, brown or yellowish-orange background colour, by elevated tubercles, which are connected by network of ridges that surround some deep, rounded pits, that resemble sponge oscula. Distinctive are extensible pointed papillae which are attached to the tips of scattered tubercles and are arranged along the ridges. These papillae are fluid filled and can be fully retracted when disturbed. The rhinophores are dull brownish. The gills are greyish-tan.
At the Sea-Slug Forum are pictures of very similar looking specimens from Heron Island (Great Barrier Reef) and from Reunion Island, pictures of more variants including similar specimens from the Marshall Islands are at Kwajalein Underwater,
these variants are in IPN as Sclerodoris sp. 2 at page 188:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
Let me quote the description: "This species is similar to Sclerodoris apiculata but with more regular depressions that resemble sponge oscula. there are dark spots in the center of each depression."
More information on Sclerodoris apiculata are on Bill Rudman's Sea-Slug Forum!