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Diagnostic Features
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Test ovate in outline, domal to subpyramidal in profile with ambitus close to base. Lower surface with posterior raised keel.
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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.
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Posterior ocular plates not in contact with periproct.
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Peristome small circular and subcentral; hardly sunken.
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Ambulacra simple aborally; all five with small oblique pore-pairs; non-petaloid. Aboral plates low and wide and relatively numerous.
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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.
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Ambulacra very slightly depressed towards peristome.
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Periproct inframarginal on short, steeply sloping posterior face; tall and tear-drop-shaped. Linked to posterior oculars by catinal elements.
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Aboral tubercles of scattered tubercles set in groundmass of granules.
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Distribution
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Middle to Upper Jurassic (Callovian - Tithonian), Europe.
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| Name gender |
feminine |
| Type |
Disaster voltzii Agassiz, 1839, p. 8, by subsequent designation of Lambert & Thiery, 1924, p. 391.
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| Species Included |
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C. voltzii (Agassiz, 1839); Tithonian; France, Switzerland [C. verneuili (d'Orbigny, 1870); Oxfordian, France nd a synonym].
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C. castanea (Desor, 1858);
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C. altus Saucede et al. 2013; Callovian, France
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| Classification and/or Status |
Irregularia; Stem group Atelostomata; Collyritidae.
?Monotypic: Monophyletic.
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| 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).
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: January 2013, Vol. 87, No. 1, pp. 105-122.
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