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Issue: Vol. 1549 No. 1: 15 Aug. 2007
Type: Article
Published: 2007-08-15
DOI: 10.11646/zootaxa.1549.1.2
Page range: 29–42
Abstract views: 91
PDF downloaded: 6

Hypselodoris jacksoni, a new species from the south-western Pacific Ocean (Nudibranchia: Chromodorididae), with a discussion on intraspecific variation  in mantle glands in Chromodoris willani Rudman, 1982

Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0202, USA
Museum and Art Gallery of the Northern Territory, GPO Box 4646, Darwin, Northern Territory 0801, Australia
Mollusca mantle glands nudibranch Opisthobranchia Gastropoda

Abstract

A new species of Hypselodoris (Chromodorididae) is described from the subtropical and temperate south-western Pacific Ocean (eastern Australia, Lord Howe Island, Norfolk Island). The colouration of Hypselodoris jacksoni sp. nov. is distinctive, though highly variable intraspecifically. Hypselodoris jacksoni belongs to the Indo-Pacific Hypselodoris clade (for which the key synapomorphy is a minute receptaculum seminis) and, based on comparisons of internal and external morphology, appears to belong to a subclade characterised by an elevated branchial sheath, probably most closely related to H. krakotoa Gosliner & Johnson, 1999, H. reidi Gosliner & Johnson, 1999 and H. regina Ev. & Er. Marcus, 1970. Intraspecific variation in the arrangement of mantle glands in H. jacksoni prompted a preand post-fixation comparison of mantle glands in another chromodorid, Chromodoris willani Rudman, 1982. These results indicate these structures can vary significantly within a population (and thus species), and it is likely that too much emphasis has been placed on mantle glands for separating species in the recent literature.

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