Ilanga bicarinata subsp. bicarinata A. Adams & Reeve 1850
Creators: name: Herbert, David G.
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Archaeogastropoda
Trochidae
Ilanga
Ilanga bicarinata
Ilanga bicarinata bicarinata (a. adams &amp; reeve, 1850)

description: Ilanga bicarinata bicarinata (A. Adams & Reeve, 1850) —revised taxonomy
Margarita bicarinata A. Adams & Reeve, 1850 in 1848 – 1850: 49, pl. 11, fig. 11a, b. Type loc.: Eastern Seas [HMS Samarang], erroneous, here emended to Agulhas Bank; holotype in NHM (NHMUK 1879. 2.26.186), figured by Herbert (1987c: figs 217–219).
Solariella undata G.B. Sowerby (II), 1870: 251. E.A. Smith, 1906: 55. Barnard, 1963a: 236, fig. 10b, d, f. Kensley, 1973: 44, fig. 107. Type loc.: Agulhas Bank, S. Africa; two probable syntypes in NMW (55.158.05.52), none in NHM (Herbert 1987c). Syn. nov.
Minolia undata — Martens, 1904: 47, pl. 5, fig. 5.
Solariella gratiosa Thiele, 1925: 15 [49], pl. 1[13], fig. 20. Type loc.: Valdivia St’n 103 (35°10.5ʹS: 23°02ʹE), 500 m [slope off Agulhas Bank, south of Knysna]; two syntypes in ZMB (in poor condition). Syn. nov.
Solariella valdiviae Thiele, 1925: 13 [47] pl. 1[13], fig. 15. Type loc.: Valdivia St’n 104 (35°16ʹS: 22°26.7ʹE), Agulhas Bank, off Mossel Bay, 155 m; holotype in ZMB. Syn. nov.
Ilanga bicarinata — Herbert, 1987c: 380, figs 217–219.
Ilanga gratiosa — Herbert, 1987c: 305.
Ilanga undata undata — Herbert, 1987c: 326, figs 80–84, 86, 87.
Distribution. Algoa Bay (off Cape Recife) to Atlantic Cape (off Namaqualand); 108–400 m (living 108–171 m).
Notes. The ‘Eastern Seas’ locality cited as the ‘habitat’ for many taxa described from the voyage of HMS Samarang is notoriously vague and frequently erroneous (Petit 2007; Herbert 2013). In 1987, I speculated that Margarita bicarinata A. Adams & Reeve, 1850 might be another example of a South African taxon being incorrectly localised as originating from ‘Eastern Seas’. At that time, however, the solariellid fauna of the central Indo-West Pacific was little known and, erring on the side of caution, I was reluctant to definitively conclude that Margarita bicarinata was in fact a South African rather than an oriental species. In the intervening years the solariellid fauna the ‘Eastern Seas’ has become better documented (Poppe Tagaro & Dekker 2006; Poppe & Tagaro 2008c; Vilvens 2009; Williams et al. 2013; Vilvens, Williams & Herbert 2014; Vilvens & Williams in press), but no species resembling Margarita bicarinata has been encountered. As a result, I believe it can be justifiably concluded that Margarita bicarinata was originally mislocalised and that it is in fact the Agulhas Bank taxon currently known by the name Ilanga undata undata. Similarly mislocalised South African species include Marginella diadochus A. Adams & Reeve, 1848, Pleurotoma impages Adams & Reeve, 1848 and Turritella declivis A. Adams & Reeve in Reeve, 1849 (Herbert 2013).
The syntypes of Solariella gratiosa Thiele, 1925 are in poor condition, but appear to represent elevated specimens of Ilanga b. bicarinata.
description: Published as part of Herbert, David G., 2015, An annotated catalogue and bibliography of the taxonomy, synonymy and distribution of the Recent Vetigastropoda of South Africa (Mollusca), pp. 1-98 in Zootaxa 4049 (1) on page 44, DOI: 10.11646/zootaxa.4049.1.1, http://zenodo.org/record/245367