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All of these species of Haminoea have rounded orange spots of various sizes and are very similar:
Haminoea sp. 02 which has smaller orange spots.
Haminoea ovalis which differs by its rounded black and purple spots,
Haminoea cymbalum which differs by broad orange bands and spots surrounded by opaque white
This species is most likely as Haminoea sp. 2 in Gosliner et al. (2015) page 30, and as Haminoea sp. 1 at the Sea Slug Forum.
There are pictures of this species online from Japan, from the Marshall Islands, and from Hawaii.
The website NUDIPIXEL is down, that is the pictures of this species from Milne Bay, Papua New Guinea, from Manado, Indonesia,
and from Green Island, Taiwan are gone.
Gosliner, T.M, D.W. Behrens & Á.Valdés. 2015. Nudibranch &Sea Slug Identification Indo-Pacific.
New World Publications Inc. Jacksonville, FL. 408 pp.
Rudman, W.B., 1999 (March 21) Haminoea sp. 1. [In] Sea Slug Forum. Australian Museum, Sydney.
Available from http://www.seaslugforum.net/find/hamisp1
How to cite:
Köhler, E. (2018), published 30 November 2018, Haminoea sp. 04 Genus: Turton & Kingston in Carrington, 1830
available from https://www.Philippine-Sea-Slugs.com/Cephalaspidea/Haminoea_sp_04.htm