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Diagnostic Features
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- Test subovate, of small to medium size, broad with greatest width posterior to centre; oral surface slightly sunken towards the peristome.
- Apical system slightly anterior, tetrabasal, with four gonopores, no catenal plates, short posterior ocular plates (advanced form).
- Petals narrow, open, tapering distally, extending two-thirds distance to ambitus, inner pore round, outer pore slightly elongated transversely; all ambulacral plates double pored.
- Periproct supramarginal, longitudinal, opening into anal sulcus extending from periproct to posterior margin.
- Peristome anterior, pentagonal, depressed, equant.
- Bourrelets absent.
- Phyllodes slightly widened, double pored, with an inner and an outer series of rounded pores in each half ambulacrum.
- No buccal pores.
- No naked zone in posterior interambulacrum orally.
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Distribution
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Bajocian (Middle Jurassic) to Cenomanian (Late Cretaceous) of Europe. |
| Name gender |
masculine |
| Type |
Echinobrissus lorioli Cotteau, 1871, p. 236; by subsequent designation of Lambert, 1898, p. 468. |
| Species Included |
- C. lorioli (Cotteau, 1871); Late Bajocian-Callovian, France
- C. micraulus (L. Agassiz, 1839): Callovian, Europe
Lambert & Thiery (1909-1925) list 53 nominal species within this genus.
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| Classification and/or Status |
Irregularia; Neognathostomata; 'nucleolitid'.
Subjective junior synonym of Nucleolites Lamarck, 1801.
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| Remarks |
There are no diagnostic features to differentiate Clitopygus from Nucleolites.
G. Cotteau. 1867-1874. Paleontologie francaise ou description de fossiles de la France. Terrain Jurassiques. Tome IX. Echinoidea. G. Masson, Paris. 552 pp., pls. 1-142.
J. Lambert & P. Thiery. 1909-1925. Essai de nomenclature raisonnee des echinides. Libraire Septime Ferriere, Chaumont, 607 pp., 15 pls.
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