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Chelodes cooperi
Taxonomy
Preacanthochiton cooperi was named by Bergenhayn (1960). Its type specimen is USNM 137370 and is not a trace fossil.
It was recombined as Praecanthochiton cooperi by Runnegar et al. (1979); it was recombined as Chelodes cooperi by Pojeta et al. (2010).
It was recombined as Praecanthochiton cooperi by Runnegar et al. (1979); it was recombined as Chelodes cooperi by Pojeta et al. (2010).
Synonymy list
| Year | Name and author |
|---|---|
| 1960 | Preacanthochiton cooperi Bergenhayn |
| 1979 | Praecanthochiton cooperi Runnegar et al. pp. 1391 – 1392 figs. pl. 2 f. 62-66 |
| 2010 | Chelodes cooperi Pojeta et al. pp. 12 - 13 figs. pl. 2 f. 1-13; pl. 3 f. 1-9 |
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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.
†Chelodes cooperi Bergenhayn 1960
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. Runnegar et al. 1979 | Most of the specimens of Preacanthochiton from the Eminence Dolomite are external or internal molds of conical plates that seem to be tail valves. Each such plate has a subcentral apex, an angular bend at the symmetry plane, and a microornament of fine granules. Comarginal growth lines are visible on well preserved external molds. Although it is possible that the Preacanthochiton skeleton was composed of a series of contiguous or partly overlapping plates of this type (see Bergenhayn's, 1960, reconstruction, textfig. I), a few transversely elongated shorter plates also are in the collection (e.g., P1. 2, figs. 62, 64). We consider these to be the intermediate valves of Preacanthochiton. Each has a flat posterior surface that would have articulated with preceding similar plates or with the tail valve. No convincing head plate has been identified. |