Phrixgnathus marginatus Hutton, 1882

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 : 41-42

Phrixgnathus marginatus Hutton, 1882

Pl. 5, fig. D

Hutton, 1882. The New Zealand Journal of Science, 1: 281.

Type material. Lectotype (designated here), CMNZ M1382.1, and paralectotypes, CMNZ M1382.2 (1), NMNZ M.276340 [ex H. Suter colln.] (3) (dry shells). The molluscan collection at CMNZ has radula fragments mounted on a glass slide with the label details ‘ Phrixgnathus marginatus, Greymouth, XVI p. 168’, in Hutton’s handwriting (i.e., CMNZ 2017.17.7), which is probably primary type material (see radula descriptions by Hutton 1883d: 137, 1884b: 168).

Label details. CMNZ M1382—‘Greymouth, R. Helms, Hutton Coll. pill box no. 111’; NMNZ M.276340— ‘81. Phrixgnathus marginatus, Hutt., Helms , Greymouth’, in H. Suter’s handwriting.

CMNZ molluscan catalogue details. M1382—‘ Phrixgnathus marginatus Hutton, Greymouth (2 specimens) (old No. 111) ’.

Type locality. ‘Greymouth (R. Helms)’ ( Hutton 1882p: 281, 1883d: 137).

Previous illustrations of type material. Radula teeth illustrated by Hutton (1884b: pl. 9, fig. S) probably from type material; Pilsbry (1892 [in 1892–1893]: 60, 304, pl. 23, figs. 94–96—‘drawn from the type’, ‘H. Suter, del.’); Suter (1915: pl. 10, figs. 4, a, b).

Remarks. Hutton submitted a description of Phrixgnathus marginatus to the Transactions and Proceedings of the New Zealand Institute issue for 1882, but publication was delayed until May 1883 ( Hutton 1883d: 137), and was pre-empted by a brief description in an account of a meeting of the Philosophical Institute of Canterbury ( Hutton 1882p: 281). A description by Hutton (1884b: 168, pl. 9, fig. S) of a radula of marginatus was probably based on the putative type material in CMNZ 2017.17.7 mentioned above. This species was recorded from Greymouth only by Hutton (1884c: 197), Hedley & Suter (1893: 647), Suter (1894b: 278, 1913: 754) and Powell (1979: 329), but museum collection records indicate that it is more widely distributed on the West Coast, South Island (below). Phrixgnathus marginatus Hutton, 1882 is the type species of Phrixgnathus Hutton, 1882 , by monotypy (i.e., not P. celia Hutton, 1883 , by subsequent designation, as incorrectly stated by Pilsbry 1893 [in 1893–1895]: 9; Suter 1913: 738; Powell 1979: 325; Schileyko 2002: 1048).

Current taxonomy. Phrixgnathus marginatus Hutton, 1882 — Hutton (1884c: 196), Spencer et al. 2009 (217).

Distribution. New Zealand; northwestern South Island, between Greymouth and Cape Farewell (AIM and NMNZ collection records).