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Mastaster
Taxonomy
Mastaster was named by Mercier (1935) [Sepkoski's age data: K Ceno K Turo]. It is not extant. Its type is Mastaster villersensis.
It was assigned to Goniasteridae by Mercier (1935), Spencer and Wright (1966) and Breton (1992); and to Valvatida by Sepkoski (2002).
It was assigned to Goniasteridae by Mercier (1935), Spencer and Wright (1966) and Breton (1992); and to Valvatida by Sepkoski (2002).
Species
M. villersensis (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1935 | Mastaster Mercier |
| 1966 | Mastaster Spencer and Wright p. U62 |
| 1992 | Mastaster Breton p. 370 |
| 2002 | Mastaster Sepkoski |
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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 | |
|---|---|---|
| G. Breton 1992 | Form large, massive, and stellate with short arms. Interbrachial arc rounded. Marginals relatively high, larger than long in the interradius to squared in the arm. Nein to eleven pairs of marginals per half-arc. Width of the marginals decreases progressively from the third superomarginal to the first inferomarginal to the arm tip. First interradial superomarginal plate larger, wider and higher than the others, with a highly inflated external face. Abactinal dome of various development and shape. In abactinal view, the first interradial superomarginal differentiated from other superomarginals by asymmetry and the inflation of the external face. Short conical spine on the terminal plate. Superomarginals in contact radially from the sixth to eighth marginal. Abactinal plates high. Radial abactinals cylindrical, stellate in abactinal view. Interradial abactinal plates polygonal. Actinolateral plate polygonal. External face smooth or with ornament of fine, flush granule-pits of various density. |