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Ceramaster obtusus
Taxonomy
Ceramaster obtusus was named by Rasmussen (1972). It is not extant. Its type specimen is Geological Museum, Copenhagen, Holotype 12794.
Synonymy list
| Year | Name and author |
|---|---|
| 1972 | Ceramaster obtusus Rasmussen pp. 54-55 figs. pl. 5 fig. 11-13 |
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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.
†Ceramaster obtusus Rasmussen 1972
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. W. Rasmussen 1972 | A Ceramaster with equal number of superomarginals and inferomarginals. The marginals have scattered spine pits on the free surface and a depressed border with clossely placed, small shallow spine pits where small, rudimentary spines have been attached. The median superomarginals are evenly arched and a little tumid. The terminal superomarginal is ratehr large and compact, subtriangular with rounded free surface indicating an obtuse arm-point. The terminal superomarginals meets the corresponding plate in its entire height along the midline of the arm, leaving no surface against the body cavityu. The legth of the plate is a little greater than its height and width. The inferior surface of the terminal superomarginal is a single joint face for the inferomarginal. The inferomarginals are less arched and not tumid. The terminal inferomarginal is almost identical in form and size with the terminal superomarginal but less tumid, and it shows faint impressions of adambulacral plates on the otherwise plane surface against the ambulacral system. |