Differs from Corystus in having a distinct groove adorally leading to the peristome, and in having a narrower and more elongate sternal plate and meridoplacous plating in the lateral interambulacra adorally. Differs from Cardabia in having four gonopores, not three and in having a distinct oral sulcus leading to the peristome.
Neraudeau et al. (1999) described a species from the Maastrichtian of Snow Hill, Antarctica as Huttonechinus antarctica sp. nov. However, this taxon does not appear to have the distinctive plastronal plating structure of that genus and is more likely to be a stegasterid.
Foster, R. J. & Philip, G. M. 1978. Tertiary holasteroid echinoids from Australia and New Zealand. Palaeontology 21, 791-822.
Neraudeau, D., Crame, J.A. & Kooser, M. 1999. Upper Cretaceous echinoids from James Ross Basin, Antarctica. Geobios 33, 455-466.