Notes on the New Zealand hydrobiid fauna (Mollusca: Gastropoda : Hydrobiidae)

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Abstract
The author's earlier ideas on the distribution and systematics of New Zealand Hydrobiidae are reviewed and revised. There are two main components to the fauna — an ancient subterranean group whose ancestors were widespread before rifting of Gondwanaland and have a distribution taking in New Zealand, Europe and Japan, and a more recently evolved group. The more recent group was probably a Gondwanian development and is typified by Australasian Hemistomia group and Fluviopupa group genera such as Potamopyrgus Stimpson and Opacuincola Ponder. Kuschelita Climo, 1974 and Phreatica Velkovrh, 1970 are synonymised with Saganoa Kuroda and Habe, 1958, the latter elevated from sub generic ranking in Akiyoshia Kuroda and Habe, 1954. Iglica Wagner, 1927 may be an earlier name for this complex. The genus Horatia Bourguignat, 1887 is tentatively introduced to the New Zealand fauna with description of a new species, H. nelsonensis. Opacuincola troglodytes Climo, 1974 is transferred to Potamopyrgus. Potamopyrgus cresswelli Climo, 1974 is recorded from Nelson and P. gardneri Climo, 1974 and P. manneringi Climo, 1974 are synonymized with it.

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