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Abstract
Two Jorunna species are recorded from New Zealand waters for the first time. One species is recognized as the temperate Australian J. pantherina (Angas, 1864), the other as a new species. Both species are described and illustrated. The distinction between Jorunna Bergh, 1876 and the closely related Kentrodoris Bergh, 1876 (both in the family Kentrodorididae), and Rostanga Bergh, 1879 (Rostangidae) is lessened after a re-appraisal of descriptions of these genera and, particularly, the analysis of the structure of the new species. Jorunna is still separable from Kentrodoris in having a pleurembolic penis (an ensheathed muscular glans when retracted), and Rostanga in possessing a solid stylet (accessory part of the reproductive system) and fewer rows and teeth/row in the radula. Lessening the distinction between these genera strengthens further the case against the maintenance of many of the cryptobranch dorid families. Therefore, Jorunna is classified here as a member of the virtually all-embracing Dorididae. Jorunna pantherina is recognized principally on colour (a brown or purplish brown ground with darker patches outlined with white) and J. ramicola n.sp. on colour (irregular patches of orange brown) and the shape of the radular teeth (innermost denticulate, outer teeth long, curves spines, outermost denticulate). Apparently closest to J. ramicola n. sp. are J. hartleyi (Burn, 1958) from Victoria, Australia and J. evansi (Eliot, 1906) from the Cape Verde Is. mainly in having similar radular teeth, but the new species differs from J. hartleyi in colour (irregular orange-brown patches), in being much smaller, in having shorter oral tentacles, pointed tubercles, peg-like labial elements (rodlets), a larger radula, also in inhabiting an erect form of sponge, and from J. evansi in possessing a solid stylet (accessory part of the reproductive system), short labial elements, and a larger radula.