The Echinoid Directory

Huttonechinus Foster & Philip, 1978, p. 799

Diagnostic Features
  • Test ovate with distinct anterior sulcus below the ambitus but no sulcus at or above the ambitus; posterior face short and truncate; tall and domal in profile.
  • Apical disc with four gonopores. Hydropores confined to genital plate 2.
  • Ambulacra flush aborally; pore-pairs with similar-sized pores - those in anterior ambulacrum a little smaller. Pores small and circular, apparently not in groove.
  • Peristome anterior of centre; ovate and a little depressed. Facing downwards.
  • Plastron plating orthosternous with labral plate followed by a single large, elongate sternal plate then a pair of small, symmetical episternal plates and finally a single rostral plate.
  • Periproct on short truncate posterior face.
  • Aboral tuberculation with small tubercles set in a dense groundmass of fine granules.
  • Subanal fasciole present, encircling the rostral plate.
Distribution
Early Oligocene of New Zealand.
Name gender masculine
Type
Macropneustes spatangiformis Hutton, 1873, p. 40, by original designation.
Species Included
  • Only the type species.
Classification and/or Status

Holasteroida, Meridosternata, Urechinina, Corystusidae.

Monotypic.

Remarks

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.