en Roboastra gracilis

Roboastra gracilis is a species of sea slug, a polycerid nudibranch, a marine gastropod mollusc in the family Polyceridae.^[2]

Distribution

This sea slug is found in the tropical western Pacific Ocean.

Robastra gracilis is a relatively small nudibranch reaching only 20–25 mm (2-2.5 cm) in length.

^ Bergh L. S. R. (1877). Malacologische Untersuchungen. In: Semper C. G. Reisen im Archipel der Philippinen, Wissenschaftliche Resultate. Band 2, Heft 11: 429-494, Pls. 54-57.
^ Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdes A. & Warén A. 2005. Classification and nomenclator of gastropod families. Malacologia: International Journal of Malacology, 47(1-2). ConchBooks: Hackenheim, Germany. ISBN 3-925919-72-4. ISSN 0076-2997. 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278