Unio rugatus Hutton, 1883

Pl. 1, fig. B

Hutton, 1883. New Zealand Journal of Science, 1: 478.

Type material. Lectotype, CMNZ M680 (pair of dry valves) . Lectotype fixed by inference of holotype (ICZN Art. 74.6) by Allan (1938: 183) .

Label details. ‘Lake Pearson, coll. J.D. Enys’.

Type locality. ‘Lake Pearson, Upper Waimakariri (J. D. Enys)’ (Hutton 1883h: 478, 1884d: 216).

Previous illustrations of type material. Marshall et al. (2014: figs. 4A, C—lectotype).

Remarks. Based on one or more specimens collected by John Enys. Hutton submitted a description of Unio rugatus to the Transactions and Proceedings of the New Zealand Institute issue for 1883, but publication was delayed until May 1884 (Hutton 1884d: 216), and was pre-empted by a brief description of Unis [sic] rugatus in an account of a meeting of the Philosophical Institute of Canterbury (Hutton 1883h: 478). Unio rugatus Hutton, 1883 is a junior homonym of Unio rugatus Menke, 1828, and was renamed Diplodon (Hyridella) menziezi [sic] rugulosus by Simpson (1914), based on Hutton’s type material from Lake Pearson. This taxon has been treated as a subspecies of the morphologically variable species Unio menziesii Gray, 1843 (e.g., by Suter 1894b: 291; 1905: 238; 1913: 943; Simpson 1900: 889; Simpson 1914: 1291) and as a junior synonym of U. menziesii by Dell (1953: 230), McMichael & Hiscock (1958: 460), Powell (1979: 384) and Marshall et al. (2014: 10). The last-mentioned species is endemic to New Zealand, and is widely distributed in lakes, rivers and streams in the North and South Islands, and on Great Barrier Island (Marshall et al. 2014: 12, fig. 6).

Current taxonomy. A junior synonym of Echyridella menziesii (Gray, 1843) — Dell (1953: 230 —in Hyridella), McMichael & Hiscock (1958: 460 —in Hyridella ( Echyridella)), Powell (1979: 384 —in Hyridella), Marshall et al. (2014: 10).

Land, freshwater and estuarine gastropods

Part 1: Native land, freshwater and estuarine species

Subclass Caenogastropoda

Order Architaenioglossa