The Echinoid Directory

Duncaniaster Lambert, 1896, p. 317

Diagnostic Features
  • Test ovate with faint anterior sulcus; posterior face truncate.
  • Apical disc with four gonopores. Hydropores confined to genital plate 2.
  • Ambulacra all similar; flush; pore-pairs small with similar-sized pores; not conjugate.
  • Peristome a little anterior of centre; ovate and depressed.
  • Plastron plating orthosternous with labral plate followed by a single large sternal plate then a pair of small, symmetical episternal plates and a single rostral plate.
  • Periproct marginal, ovate.
  • Tuberculation not preserved.
  • Subanal fasciole presumably present but not seen on holotype due to poor preservation.
Distribution
Late Eocene of Glenaire, Victoria, Australia.
Name gender masculine
Type
Holaster australiae Duncan, 1877, p. 51, by original designation.
Species Included
  • Only the type species.
Classification and/or Status

Holasteroida, Meridosternata, Urechinina, Corystusidae.

Subjective synonym of Corystus Pomel, 1883.

Remarks

The nomenclatural history of this taxon is complicated and was clarified by Foster & Philip (1976a). They suggested Holaster australis was synonymous with Corystus dysasteroides (Duncan), but the smaller unsunken pore-pairs indicate at least specific distinction.

Foster, R. J. & Philip, G. M. 1976a. Corystus dysasteroides, a Tertiary holasteroid echinoid formerly known as Duncaniaster australiae. Transactions of the Royal Society of South Australia 100, 113-116.

Lambert, J. 1896. Notes dur quelques echinides cretaces de Madagascar. Bulletin de la Societe geologique de France, (3), 24, 313-331, 3 pls.