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Very similar are:
Dendrodoris albopurpura which differs by the whitish encircled pustules each tipped with a brown or purple spot,
Dendrodoris albobrunnea which lacks the whitish star-like markings, many pictures of it at the internet are misidentified, showing Dendrodoris elongata, and
Dendrodoris sp. which differs by a fine network of grey pigment, and by the rhinophores wich have subapical black pigment
in IPN at page 279:
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.
More information on Dendrodoris elongata are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2018), published 6 May 2018, Dendrodoris elongata Baba, 1936
available from http://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Dendrodoris_elongata.htm