The Echinoid Directory

Cyclolampas Pomel 1883, p. 51

Diagnostic Features
  • Test ovate in outline, domal to subpyramidal in profile with ambitus close to base. Lower surface with posterior raised keel.
  • Apical disc slightly posterior of centre; disjunct. tetrabasal; ocular plates II and IV meeting behind the anterior genital plates. Posterior genital plates small and separated from ocular plates II and IV by a pair of catinal plates. Catinal plates also extend to posterior oculars and beyond to periproct.
  • Posterior ocular plates not in contact with periproct.
  • Peristome small circular and subcentral; hardly sunken.
  • Ambulacra simple aborally; all five with small oblique pore-pairs; non-petaloid. Aboral plates low and wide and relatively numerous.
  • On oral surface pore-pairs become offset in threes and crowded into phyllodes; at least 30 pore-pairs in each column forming phyllode; occluded plates extensively developed.
  • Ambulacra very slightly depressed towards peristome.
  • Periproct inframarginal on short, steeply sloping posterior face; tall and tear-drop-shaped. Linked to posterior oculars by catinal elements.
  • Aboral tubercles of scattered tubercles set in groundmass of granules.
Distribution
Middle to Upper Jurassic (Callovian - Tithonian), Europe.
Name gender feminine
Type
Disaster voltzii Agassiz, 1839, p. 8, by subsequent designation of Lambert & Thiery, 1924, p. 391.
Species Included
  • C. voltzii (Agassiz, 1839); Tithonian; France, Switzerland [C. verneuili (d'Orbigny, 1870); Oxfordian, France nd  a synonym].
  • C. castanea (Desor, 1858); Callovian, Switzerland.
  • C. altus Saucede et al. 2013; Callovian, France.
Classification and/or Status

Irregularia; Stem group Atelostomata; Collyritidae.

?Monotypic: Monophyletic.

Remarks
Distinguished from all other collyritids by having well developed phyllodes adorally with pore-pairs arranged in wide arcs of three and with occluded plates. 

The genus has been revised by Saucede et al. (2013).

Pomel, A. 1883. Classification méthodique et genera des Échinides vivante et fossiles. Thèses présentées a la Faculté des Sciences de Paris pour obtenir le Grade de Docteur ès Sciences Naturelles, 503, 131 pp. Aldolphe Jourdan, Alger.

Saucede,T.,  Bonnot, A., Marchand, D. & Courville P. 2013. A Revision of the Rare Genus Cyclolampas (Echinoidea) Using Morphometrics with Description of a New Species from the Upper Callovian of Burgundy (France). Journal of Paleontology 87, pp. 105-122.