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This species is Melibe sp. 4 in IPN page 331
Let me quote Gosliner & Pola (2012):
EXTERNAL MORPHOLOGY: preserved specimen 12mm long. Body narrow, somewhat compressed anterolaterally, widest near posterior third of animal. Living animal transparent, with series of interconnected cream white digestive gland tubules occupying most of body and cerata. Texture of dorsum essentially smooth, but with scattered, elongate papillae located on side of body and cerata. Foot narrow and linear, with opaque margin somewhat undulate along its length, anterior foot margin entire and rounded. Oral hood relatively small with entire, circular margin. Single row of thin, elongate papillae present. Dorsal surface of the hood with larger thin, elongate papillae. Well-separated rhinophoral sheaths arising just anterior to slightly constricted neck, separating body from hood. Sheaths thin, elongate and cylindrical, widening at distal margin: single posterior elongate papilla present. Rhinophore club-shaped with 3-4 lateral lamellae. Laterally flattened cerata arising from cylindrical bases and expanding into wedge-shaped structures that gradually widen distally. Cerata four per side, arranged close to the midline. Series of 5-6 conical papillae found on the lateral margins of cerata. Along the distal margins of each ceras with 4-6 elongate papillae, each containing extension of digestive gland tissue for entire length of the ceras. Cerata dehiscent along base, and easily shed or autotomized. Several cerata no longer attached. Anus on low elevation located just anterior to second anterior ceras on right side, slightly dorsal to ceratal midline. Nephroproct immediately dorsal to anus, on anal papilla. Gonopore directly ventral to anteriormost right ceras, proximal to lateral midline. No distinct papillae present around genital atrium."
The most unique attribute of the genus Melibe is their method of feeding. They have no radular teeth and but have developed the oral veil into a large veil or "fish net" which they use to constantly scan the substrate as they crawl along. When the sensitive papillae on the inner edge of the oral veil touch a small crab or crustacean the edge of the veil is rapidly contracted, trapping the prey, which is then ingested.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
Terrence Gosliner & Marta Pola (2012): Diversification of filter-feeding nudibranchs: two remarkable new species of Melibe (Opisthobranchia: Tethyiidae) from the tropical western Pacific, Systematics and Biodiversity, Volume 10, Issue 3, 2012 , pages 333-349
online available at: http://www.tandfonline.com/doi/abs/10.1080/14772000.2012.717551
How to cite:
Köhler, E. (2017), published 15 June 2017, Melibe colemani Gosliner & Pola, 2012
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Melibe_colemani.htm