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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Taxonomy
Callista orbiculata was named by Hall and Meek (1870).
It was recombined as Callista (Dosinopsis) orbiculata by Stanton (1893); it was recombined as Trigonocallista orbiculata by Cobban (1953); it was recombined as Cyclorisma orbiculata by Kirkland (1996).
It was recombined as Callista (Dosinopsis) orbiculata by Stanton (1893); it was recombined as Trigonocallista orbiculata by Cobban (1953); it was recombined as Cyclorisma orbiculata by Kirkland (1996).
Synonymy list
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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.
†Cyclorisma orbiculata Hall and Meek 1870
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Aberhan et al. 2004, Kiessling 2004 | |||||
Age range: base of the Cenomanian to the top of the Middle Turonian or 100.50000 to 89.80000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Cenomanian | USA (Texas) | Cyclorisma orbiculata (6646) | |
| Cenomanian | Canada (Alberta) | Callista orbiculata (87568) | |
| Late/Upper Cenomanian | USA (Montana) | Trigonocallista orbiculata (168055) | |
| Late/Upper Cenomanian | USA (Arizona) | Cyclorisma orbiculata (55634) | |
| Middle Turonian | USA (Arizona) | Cyclorisma orbiculata (53504) |