« As the Marquis de Monterosato, who kindly suggested the above name to me, points out, the fossil form [R. hystrix Jan] has a pointed protoconch, composed of three or four whorls; while the recent shell, in the character of its protoconch, rather resembles Trophon. Precisely where the fossil form disappeared and was replaced by the present shell, I am unable to determine, but the two appear to be distinct. » – E. Syke: “On the Mollusca procured during the ‘Porcupine’ Expeditions 1869-1870. Supplemental notes, part III”, Proceedings of the Malacological Society of London vol. VII: year 1906-1907, London 1907, p.187.

The loss of planktotrophy in the genus Raphitoma has been recently noticed. For the possible consequences in taxonomy and phylogeny, cf. Manousis & al., 2017. Nota bene that R. pseudohystrix shares with the Miocene-Pliocene R. hystrix the whole of the shell morphology, protoconch excepted: the extant pseudohystrix having a paucispiral proto, while the fossil hystrix beared a multispiral one.