Hypselodoris regina
Marcus & Marcus, 1970

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

DISTRIBUTION

Western Indian Ocean

PHOTO

UPPER RIGHT, LOWER LEFT: 32 mm long alive, Pangavini Island, off Kunduchi Bch, Dar es Salaam, Tanzania, Oct 1976. LOWER RIGHT: 40mm long alive, Ras Kankadya, Dar es Salaam, Tanzania, 2 November 1975. PHOTOS: Bill Rudman.

This species is very similar in colour to species of the Chromodoris quadricolor colour group, such as C. hamiltoni and C. elisabethina, with three black or dark purple longitudinal lines, a bluish background and an orange border. Its internal anatomy clearly differentiates it a s a species of Hypselodoris. Details of the colour pattern which are characteristic of this species are the ring that the median black line forms anteriorly between the rhinophores and the diffuse orange longitudinal markings on either side of the median black line. The bluish white gills are triangular in cross section and edged with orange. On the outer face distinctive white spots can sometimes be seen.

References:
•Rudman, W.B. (1977) Chromodorid opisthobranch Mollusca from East Africa and the tropical West Pacific. Zoological Journal of the Linnean Society, 61: 351-397.
•Rudman, W.B. (1982) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: Chromodoris quadricolor, C. lineolata and Hypselodoris nigrolineata colour groups. Zoological Journal of the Linnean Society, 76: 183-241.
•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., 2000 (January 17) Hypselodoris regina Marcus & Marcus, 1970. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/hypsregi

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