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Cyclospira orbus
Taxonomy
Cyclospira orbus was named by Cocks and Modzalevskaya (1997). Its type specimen is BC 51087, a valve (conjoined valves), and it is a 3D body fossil. Its type locality is Bed 4. Pryamaya River, Lower Taimyr River Basin, which is in an Ashgill offshore shelf limestone/shale in the Korotkinskaya Formation of the Russian Federation.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1997 | Cyclospira orbus Cocks and Modzalevskaya pp. 1082 - 1083 figs. Plate 5, figures 1, 3--6; Text-figures 5-6 |
| 2012 | Cyclospira orbus Rasmussen et al. pp. 57 - 58 figs. Plate 16, figures 13–19 |
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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.
†Cyclospira orbus Cocks and Modzalevskaya 1997
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. M. O. Rasmussen et al. 2012 | Shell small, ventri-biconvex in outline and oval to rhomboidal in profile.Maximumwidth at mid-valve. Ventral palintrope orthocline to weakly apsacline. Apical foramen extending beyond posterior margin. Dorsal valve evenly convex and slightly sulcate. Valves smooth, though perforated by minute holes (see SEMimage on pl. 16, fig. 19).
Ventral interior with small teeth and small, widely divergent recessive dental plates. Dorsal interior with medianly directed spiralia preserved; low, thick dorsal median septum extending for about 75% of valve length. Relatively deep dental sockets seen posterior to spiralia. |