The Echinoid Directory

Giraliaster Foster & Philip, 1978, p. 804

Diagnostic Features
  • Test cordiform; anterior sulcus deep with carina.
  • Apical disc with four gonopores. Genital plates unfused.
  • Paired ambulacra with weakly enlarged pore-pairs. Columns in anterior paired ambulacra markedly narrower than those in the posterior column.
  • Frontal groove continuous from apex to peristome; mouth facing downwards.
  • Plastron plating protosternous with crescentic labral plate just reaching second sternal plate. Subsequent plating biserial, with plates extending almost the full width of the plastron.
  • Enlarged primary tubercles bordering the inner edge of the anterior groove.
  • Subanal fasciole present crossing interambulacral plates 4a/4b on adoral side.
Late Cretaceous (Maastrichtian) to Late Oligocene, Australia, New Zealand and Antarctic.
Name gender masculine
Giraliaster jubileensis Foster & Philip 1978, p. 805, by original designation.
Species Included
  • G. jubileensis Foster & Philip, 1978; Palaeocene, Carnarvon Basin, western Australia.
  • G. tertiarius (Gregory, 1890); Late Eocene, southern Australia.
  • G. sulcatus (Hutton, 1873); Late Eocene, southern Australia.
  • G. bellissae Foster & Philip, 1978; Late Oligocene, New Zealand.
  • ?G. lorioli (Lambert, 1910); Maastrichtian, Snow Hill Island, Antarctica.
Classification and/or Status

Holasteroida, stem group.

Presumed monophyletic.


Differs from Cardiaster in having a subanal fasciole rather than a marginal fasciole and a protosternous plastron. Closest to Pseudholaster, differing only in having a subanal fasciole.

Foster, R. J. & Philip, G. M. 1978. Tertiary holasteroid echinoids from Australia and New Zealand. Palaeontology 21, 791-822.