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Noalda sp. 03  Genus: Iredale, 1936

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Noalda sp. 03 is characterized by its dark grey/lavender background colour, and by a white marginal and a black submarginal band on the parapodia, the "tails", and head shield. Distinctive is a transverse opening in the posterior shield with a black margin, through which the shell is visible. There are some whitish spots on the outer surface of the parapodia.
Pretty similar are:
Noalda sp. 3 in IPN, page 38, which differs by a lavender colour, by a round opening in the middle of the posterior shield, and by a black marginal band, the same species is as Aglajid sp. 6 on the Sea Slug Forum, but some specimens with a transverse opening (not round)
Robert F. Bolland has on his Okinawa Slug Site 2 similar species of Noalda:
his Noalda sp. 1 is most probably the same species as IPN Noalda sp. 3 though the opening differs,
his Noalda sp. 2 has a white marginal band, lacks the black submarginal band, lacks white spots on the parapodia
Reference:
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.
How to cite:
Köhler, E. (2016), published 24 June 2016, Noalda sp. 03  Genus: Iredale, 1936
available from http://www.Philippine-Sea-Slugs.com/Cephalaspidea/Noalda_sp_03.htm