The Echinoid Directory

• Apical disc and peristome unknown.
• Interambulacrum with 6-8 plates in a series. Primary tubercles perforate and non-crenulate; areoles circular and incised; separated with scrobicular circles contiguous on ambital and adapical plates.
• Scrobicular tubercles differentiated. Extrascrobicular zones relatively narrow comprising rather sparse secondary tubercles and granules, best developed interradially.
• Ambulacra only weakly sinuous. Pore zones not incised. Pore-pairs oblique and narow, with narrow interporal partition. Perradial zone with marginal series of contiguous primary tubercles and two smaller inner secondary tubercles.
• No pits or naked furrows.
• Primary spines cylindrical and slender with moderately long collar and no neck. The shaft is ornamented by irregular distally pointing thorns that may begin to coalesce to form flanges, especially distally. Distally the spine may be flaired into a crown.

Miocene, Australia.

Goniocidaris prunispinosa Chapman & Cudmore, 1928, p. 90, by original designation.

• Only the type species.

Cidaroida; Cidaridae, Goniocidarinae.

Monotypic; ?subjective junior synonym of Goniocidaris

The type species was originally described from spines alone which are almost indistinguishable from those of Goniocidaris biserialis. Chondrocidaris also has spines ornamented with large flank-like spines along the shaft, but in test morphology it is quite different in appearance. Despite the absence of well marked sutural pits in the interambulacral plates attributed to the type species by Philip (1964), the taxon is provisionally placed as a synonym of Goniocidaris.

Philip, G. M. 1964. The Tertiary echinoids of South-East Australia. Proceedings of the Royal Society of Victoria 77, 433-477, pls 58-67.