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Hymeniastrum
Taxonomy
Hymeniastrum was named by Ehrenberg (1847) [Sepkoski's age data: J u R]. It is extant. It was considered unknown by Ehrenberg (1847).
It was assigned to Spongodiscidae by Ehrenberg (1847); and to Spumellaria by Sepkoski (2002).
It was assigned to Spongodiscidae by Ehrenberg (1847); and to Spumellaria by Sepkoski (2002).
Species
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Diagnosis
Reference | Diagnosis | |
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C. G. Ehrenberg 1847 | Small, disc-shaped body, median part nucleate, with a sometimes wide or concentrically cellular margin. (Mixed) Median chamber wide and nucleate, margin delicate with concentric rows or irregular spongy. Lobate or radiate. Radii joined at the base by a cellular membrane |