Hypselodoris bollandi
Gosliner & Johnson, 1999

Order: NUDIBRANCHIA
Suborder: DORIDINA
Superfamily: EUDORIDOIDEA
Family: Chromodorididae

DISTRIBUTION

Known from the Philippines and Okinawa.

PHOTO

Upper: Anilao, Luzon Island, Philippines, April, 2002. Lower: Juvenile animal. Anilao, Luzon Island, Philippines, (approximately 8-10mm), April, 2000. Photos: Jeff Rosenfeld

Adult Hypselodoris bollandi are very similar in external appearance to the yellow spotted species of Risbecia, R. pulchella, R. godeffroyana and R. imperialis but it differs in a number of features. Its rhinophores are translucent reddish orange and its gills are translucent white with red-orange edging. The gills of the Risbecia species are vibrate rhythmically and are arranged with secondary spirals while in H. bollandi they form a simple circle. The mantle glands in H. bollandi are restricted to the anterior and posterior ends of the mantle while in species of Risbecia there are glands down each side of the mantle as well. From the few photos available (see Gosliner & Johnson, 1999, Bob Bolland's website), in adults the blue becomes much darker and a diffuse reticulate pattern of dark blue develops over the mantle, much as in species of Risbecia.

Reference:
• Gosliner, T.M. & Johnson, R.F. (1999) Phylogeny of Hypselodoris (Nudibranchia: Chromodorididae) with a review of the monophyletic clade of Indo-Pacific species, including descriptions of twelve new species. Zoological Journal of the Linnean Society, 125: 1-114.

Authorship details
Rudman, W.B., 2001 (May 23) Hypselodoris bollandi Gosliner & Johnson, 1999 . [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/hypsboll

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