The Echinoid Directory

Miocidaris Döderlein, 1887 , p. 40

Diagnostic Features
  • Test with interambulacral plates more or less firmly sutured but with imbricate ambulacral/interambulacral suture.
  • Interambulacral plates not much wider than tall with denticulate adradial margin.
  • A primary tubercle dominates each plate with perforate mamelon and strongly crenulate platform. Areoles subcircular and incised. Scrobicular tubercles differentiated; scrobicular circles contiguous or narrowly separated in each series. Extrascrobicular tuberculation heterogeneous; best developed interradially.
  • Ambulacral zones, spines and lantern unknown.
Triassic (?Lower, Upper), Europe, ?Pakistan.
Name gender feminine
Cidaris klipsteini Desor, 1855, p. 4 [preoccupied by Cidaris klipsteini Agassiz & Desor, 1847] = Cidaris ampla Desor, 1858, p. 484 [replacement name] = Miocidaris cassiani Bather 1909, p. 61 [unneccessary replacement name], by subsequent designation (Bather, 1909, p. 61) .
Lectotype: NHM 36513 (designated by Bather, 1909, p. 61), Paralectotype: NHM 36512

In addition, there is an invalid subsequent type designation (Cidaris amalthei Quenstedt) by Lambert & Thiéry (1910: p. 128)
Species Included
  • M. cassiani Bather, 1909; Upper Triassic, Italy.
  • ?M. ampezzana Zardini, 1973; Carnian, Italy.
  • ?M. pakistanensis Link, 1955; Scythian, Pakistan.
Classification and/or Status

Cidaroida; stem group (miocidarids).


It is unfortunate that the type species for this genus is based on just a couple of interambulacral fragments and is basically indeterminate. Until more complete material becomes available, it is best to treat this genus as indeterminate.

Desor, E. 1855-1858. Synopsis des échinides fossiles. – lxviii+490 pp., Paris (Reinwald).

Döderlein, L. 1887. Die Japanischen Seeigel. I Thiel. Familie Cidaridae und Saleniidae. E. Schwiezerbartsche, Stuttgart. 59 pp.

Bather, F.A. 1909. Eocidaris and some Species referred to it. – The Annals and Magazine of Natural History, 8th Series, 3/13/10: 43-65.