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.
Distribution	Middle Eocene to Recent, Antarctic, Southern Australia, New Zealand.
Name gender	feminine
Type	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.
Remarks	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.