Siphonaria alternicosta Potiez & Michaud, 1838

Siphonaria alternicosta Potiez & Michaud 1838 [in 1838–1844]: 55, pl. 10, figs 18–20 (no type locality).— Menke 1844: 54; Catlow & Reeve 1845: 100; Jay 1850: 104; White & Dayrat 2012: 60.

Siphonaria alternicostata Hanley 1858b: 151 .— Paetel 1889: 427 (invalid; incorrect subsequent spelling of alternicosta).

Taxonomic remarks. The original description and original figure as the only indication to the identity of S. alternicosta provide insufficient information to identify this species. No type specimen(s) are known to exist (Philippe Bouchet; pers. comm.). Menke (1844: 54) considered S. alternicosta (incorrectly attributed to Quoy & Gaimard) as an accepted species occurring on the W coast of Australia. The original figure resembles S. restis sp. nov. from WA somewhat, but this similarity is not considered taxonomically significant. We consider S. alternicosta as a nomen dubium.