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Bursatella leachii  de Blainville, 1817

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Bursatella leachii is characterized by a mottled brownish-grey body, by highly branched elongate papillae, and by blue eyespots (ocelli), which are in some specimens greenish.
It is found in warm temperate and tropical waters throughout the world. There are several geographical subspecies recognised by some authorities, have a look at the Sea-Slug Forum for a list of them. Eales & Engel (1925) reviewed Bursatella worldwide and concluded there was only one species:
Eales, N.B. & Engel, H. (1935) The genus Bursatella de Blainville. Proceedings of the Malacological Society, 21: 279-303.
IPN writes at page 60: "Other subspecies from different parts of the world have dramatically different external morphology. The genus needs to be thoroughly reviewed."
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.
Pretty similar is Stylocheilus striatus which differs by dark longitudinal lines.
More information on Bursatella leachii are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2012), published 11 April 2012, Bursatella leachii  de Blainville, 1817
available from https://www.Philippine-Sea-Slugs.com/Anaspidea/Bursatella_leachii.htm