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Diagnostic Features
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- Test small, inflated, slightly truncated posterior margin, greatest width posterior to centre.
- Apical system anterior, tetrabasal, with four genital pores, no catenal plating (advanced form).
- Petals of equal length; rather narrow, with outer pore-pair only slightly more elongate than inner, all ambulacral plates with double pores.
- Periproct supramarginal, with groove extending from periproct opening to posterior border; edge of test may be indented.
- Peristome anterior, subpentagonal, equant. Opening sunken, with vertical-walled entrance.
- Bourrelets well developed forming small mounds.
- Phyllodes slightly broadened adorally, with two series of double pores in each half-ambulacrum.
- No buccal pores.
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Distribution
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Aptian to Lower Albian, Early Cretaceous of England and France. |
| Name gender |
masculine |
| Type |
- Nucleolites cerceleti Desor in Agassiz & Desor, 1847, p. 155; by subsequent designation of Mortensen, 1948, p. 167.
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| Species Included |
- Pomel (1883) included three species when erecting this genus, Cerceleti, Fittoni and probably Lamarckii, all Cretaceous.
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| Classification and/or Status |
Irregularia; Neognathostomata; 'nucleolitid'.
Subjective junior synonym of Nucleolites Lamarck, 1801.
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| Remarks |
Anthobrissus is very similar to Nucleolites and only differs from the type species in having a slightly more elongate test and slightly narrower petals. Such characters are not worthy of generic distinction. Anthobrissus should therefore be considered a subjective junior synonym of Nucleolites.
P. M. Kier. 1962. Revision of the cassiduloid echinoids. Smithsonian Miscellaneous Collections, 144 (3) 262 pp.
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