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Pretty similar species of Trapania are:
Trapania japonica, which differs by yellow/orange lateral processes,
Trapania sp. 05, which differs by yellow/orange lateral processes, and by brown/black tipped white rhinophores,
Trapania sp. 08, which lacks the rounded brown spots and differs by yellow/orange outer halfs of the extra-branchial and extra-rhinophoral processes.
More information on Trapania naeva are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 14 April 2016, Trapania naeva Gosliner & Fahey, 2008
available from http://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Trapania_naeva.htm