Unio rugatus Hutton, 1883

Brook, Fred J., Kennedy, Martyn, King, Tania M., Ridden, Johnathon, Shaw, Matthew D. & Spencer, Hamish G., 2020, Catalogue of New Zealand land, freshwater and estuarine molluscan taxa named by Frederick Wollaston Hutton between 1879 and 1904, Zootaxa 4865 (1), pp. 1-73 : 11-12

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