The Echinoid Directory

Austrocidaris Clark, 1907, p. 212

Diagnostic Features
  • Apical disc less than 50% test diameter; plating monocyclic; sparsely covered in granules. Periproctal plating extensive.
  • Interambulacra with 6-7 plates in a column. Primary tubercles perforate, non-crenulate with deeply incised areoles. Areoles non-confluent.
  • Scrobicular tubercles differentiated. Extrascrobicular zone hardly developed.
  • Deep interradial furrow.
  • Ambulacra weakly sinuous. Pore-pairs narrow and oblique; the two pores separated by a very narrow interporal partition.
  • Perradial zone narrow, with single marginal tubercle and median furrow.
  • Peristome with about 10 ambulacral plates in each series.
  • Primary spines long, stout and cylindrical; short collar and glabrous neck. Shaft ornamented with fine dense granulation; dense cortical hairs. Oral spines undifferentiated.
  • Secondary spines flattened and somewhat adpressed.
Middle Eocene to Recent, Antarctic, Southern Australia, New Zealand.
Name gender feminine
Temnocidaris canaliculata Agassiz, 1863, p. 18, by original designation.
Species Included
  • A. canaliculata (Agassiz, 1863); Recent, Magellan Straits.
  • A. spinulosa Mortensen, 1910; South of the Falkland Islands.
  • A. operta Philip, 1964; Miocene, Australia.
  • A. pawsoni McKnight, 1974; Recent, New Zealand.
  • A. seymourensis Radwanska, 1996; early Middle Eocene, Antarctica.
Classification and/or Status

Cidaroida, Cidaridae, Goniocidarinae.

Presumed monophyletic.


Distinguished from Ctenocidaridae and most Goniocidarinae except Ogmocidaris by having a deep interradial furrow. Ogmocidaris has a similar furrow but its peristomial plating is very different. In Ogmocidaris the interradial plates do not reach the adradial margin and there are only about 6 plates in a series. In Austrocidaris interradial plates extend the full radial length of the membrane and there are about twice as many plates in a series.

Clark, H. L. 1907. The Cidaridae. Bulletin of the Museum of Comparative Zoology at Harvard College, 51 (7), 165-230, pls 1-11.

Mortensen, T. 1928. A monograph of the Echinoidea. 1, Cidaroidea. C. A. Reitzel, Copenhagen.

McKnight, D. G. 1974. Some echinoids new to New Zealand. NZOI Records 2, 25-44.

Radwanska, U. 1996. A new echinoid from the Eocene La Mesta Formation of Seymour Island, Antarctic Peninsula. Palaeontologica Polonica 55, 117-125.