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Very similar are:
Dendrodoris elongata which lacks the whitish encircled pustules and differs by its whitish stellate markings,
Dendrodoris albobrunnea which lacks the whitish encircled pustules, many pictures of it at the internet are misidentified, showing Dendrodoris elongata, and
Dendrodoris sp. in IPN at page 279, which differs by a fine network of grey pigment, and by the rhinophores wich have subapical black pigment
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 albopurpura are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 12 March 2017, Dendrodoris albopurpura Burn, 1957
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Dendrodoris_albopurpura.htm