Fruticicola adriana 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 : 21

Fruticicola adriana Hutton, 1883

Pl. 2, fig. A

Hutton, 1883 . New Zealand Journal of Science, 1: 476.

Type material. Lectotype (designated here), CMNZ M12774 [ex M162], and paralectotypes (4), CMNZ M162 (dry shells).

Label details. CMNZ M162—‘58. Psyra adriana Hutt. , Christchurch’, pillbox label in Hutton’s handwriting.

Type locality. ‘Christchurch (Brown)’ ( Hutton, 1883g: 476 ); ‘Near Christchurch (R. Brown)’ ( Hutton, 1884b: 176 ); ‘Banks Peninsula (R. Brown)’ ( Hutton 1884c: 201 ).

Remarks. Hutton submitted a description of Fruticicola adriana to the Transactions and Proceedings of the New Zealand Institute issue for 1883, but publication was delayed until May 1884 ( Hutton 1884b: 175 ), and was pre-empted by a brief description in an account of a meeting of the Philosophical Institute of Canterbury ( Hutton 1883g: 476 ). A shell from the type series (lectotype) is illustrated here for the first time in pl. 2, fig. A. There has been confusion over the identity and distribution of this species. It was recorded from Napier and Banks Peninsula by Hutton (1884c: 201) , from Banks Peninsula and a few North Island localities by Hedley & Suter (1893: 639) and Suter (1894b: 252), and from mid Canterbury and throughout the North Island by Suter (1913: 637) and Powell (1979: 319). In a systematic review of Allodiscus and related genera, Marshall & Barker (2008: 80, fig. 9A) reinterpreted Allodiscus adriana as a morphologically variable species with a wide distribution in the South Island extending from the vicinity of Reefton to Bluff. They listed Allodiscus smithi Suter, 1894 , from Mt Somers in mid Canterbury, as a junior synonym of Allodiscus adriana (Hutton, 1883) , albeit noting that type material of the two taxa differs morphologically. Preliminary results of a phylogenetic study indicate that Allodiscus adriana sensu Marshall & Barker (2008) is in fact a complex of morphologically-similar but genetically distinct species, with typical Allodiscus adriana (Hutton, 1883) presently known from scattered records between Banks Peninsula and North Otago only (M. Kennedy & T. King unpub. data). Genetic data are not yet available for A. smithi , but differences in shell morphology compared to adriana suggest that it should be reinstated as a valid species. The systematic relationships and distributions of other taxa in the ‘ adriana ’ complex from Canterbury, Otago and Southland are the subject of ongoing investigations.

Current taxonomy. Allodiscus adriana (Hutton, 1883) — Hedley & Suter (1893: 639), Suter (1913: 637), Powell (1979: 319), Marshall & Barker (2008: 80), Spencer et al. (2009: 215).

Distribution. New Zealand; South Island, Banks Peninsula to North Otago, as noted above.