The Echinoid Directory

Temnocidaris Cotteau, 1863, p. 355

[ See also Temnocidaris (Stereocidaris) Pomel, 1883 and Temnocidaris (Hirudocidaris) Smith & Wright, 1989]

Diagnostic Features
  • Test generally rather large; moderately thick; depressed above and below.
  • Apical disc about 50% test diameter; plating unknown.
  • Interambulacra with 5 to 8 plates in a column. Plates wider than tall with wide extrascrobicular zones. Single adapical plate in each zone lacking a fully developed tubercle.
  • Primary tubercles perforate, non-crenulate; mamelon relatively small. Areoles circular and incised; widely separated on all but most adoral plates.
  • Scrobicular tubercles differentiated. Extrascrobicular zones wide and densely and uniformly covered in secondary tubercles; neural grooves present both adradially and interradially. Pits developed along sutures and sometimes amongst the secondary tubercles.
  • Ambulacra weakly sinuous; pore zones incised, pore-pairs subconjugate, the two pores separated. Perradial zone moderately wide with marginal row of small, uniform, primary tubercles and inner series of three or so slightly smaller tubercles, sometimes forming a double row. The perradial suture deeply and irregularly pitted.
  • Peristome slightly smaller than apical disc; plating unknown.
  • Primary spines long, cylindrical with slightly flared crown; neck short; shaft ornamented with fine contiguous thorns.
Distribution
Lower Cretaceous (Berriasian) to Recent; worldwide.
Name gender feminine
Type
Temnnocidaris magnifica Cotteau, 1863, p. 357, by subsequent designation of Lambert & Thiery, 1909, p. 27. University of Lyon Palaeontological collections EM 40428 (holotype).
Species Included

See subgenera:
Temnocidairs (Temnocidaris),
Temnocidaris (Stereocidaris),
Temnocidaris (Hirudocidaris)

Classification and/or Status

Cidaroida, Cidaridae, Stereocidarinae.

Monophyletic.

Remarks

The distinctive pits developed along the perradius and within the secondary tuberculation of ambital and adapical plates immediately distinguish this clade. A key to species was given by Smith & Jeffery (2000).

Three subgenera are recognized, T. (Temnocidaris), T. (Stereocidaris) and T. (Hirudocidaris).

Cotteau, G. H. 1862-1867. Paléontologie Française. Terrain Crétace, Tome Septième. Échinides.  Masson et fils, Paris.

Smith, A. B. & Jeffery, C. H. 2000. Maastrichtian and Palaeocene echinoids: a key to world faunas. Special Papers in Palaeontology 63, 1-406.