Ichnusa Jeffreys, 1847, is a nomen oblitum, not to be used for Bela Gray, 1847, over which it has priority. Ishnula Gray, 1847, is a nomen nudum.

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Basteria

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Nederlandse Malacologische Vereniging

J.J. van Aartsen. (1987). Nomenclatural notes, 3. On the genera Ichnusa (Clark, MSS) Jeffreys, 1847, and Ishnula (Clarke, MSS) Gray, 1847. Basteria, 51(4/6), 147–148.