Helix sciadium Pfeiffer, 1857

Brook, Fred J. & Ablett, Jonathan D., 2019, Type material of land snails (Mollusca: Gastropoda) described from New Zealand by taxonomists in Europe and North America between 1830 and 1934, and the history of research on the New Zealand land snail fauna from 1824 to 1917, Zootaxa 4697 (1), pp. 1-117 : 75

Helix sciadium Pfeiffer, 1857

Pl. 8, fig. G

Pfeiffer, 1857. Proceedings of the Zoological Society of London, 25: 108.

Type material: Syntypes (2), NHMUK 20150017 (dry shell material); ex Museum Cuming (Acc. no. 1829) .

Label details: ‘ H. sciadium Pfr , New Zeland’—in Pfeiffer’s handwriting.

Type locality: ‘New Zealand’ ( Pfeiffer 1857b: 108).

Remarks: Type material of Helix sciadium is illustrated here for the first time (pl. 8, fig. G). Cumber (1967b) noted that there is marked variation in shell form, sculpture and coloration among local populations of this species, and thus it may be possible to determine the provenance of the type material from a comparison of shell morphology.

Current Taxonomy: Listed as Phrixgnathus sciadium (Pfeiffer, 1857) by Hutton (1884b: 197), Suter (1904a: 61), Spencer & Willan (1995: 42) and Spencer et al. (2009: 217).

Distribution: New Zealand; North Island, north of Auckland ( Suter 1913b; Cumber 1967b; Powell 1979).