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Cardichelyon
Taxonomy
Cardichelyon was named by Hutchison (2013).
It was assigned to Platysternidae by Hutchison (2013) and Lichtig and Lucas (2015); to Pantestudinoidea by Vlachos (2018); and to Dermatemydidae by Joyce and Claude (2020).
It was assigned to Platysternidae by Hutchison (2013) and Lichtig and Lucas (2015); to Pantestudinoidea by Vlachos (2018); and to Dermatemydidae by Joyce and Claude (2020).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2013 | Cardichelyon Hutchison |
| 2015 | Cardichelyon Lichtig and Lucas |
| 2018 | Cardichelyon Vlachos |
| 2020 | Cardichelyon Joyce and Claude |
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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 | |
|---|---|---|
| W. G. Joyce and J. Claude 2020 | Our phylogenetic analyses suggest two primary hypotheses for the placement of Cardichelyon rogerwoodi: either within Testudinoidea or as sister to Agomphus pectoralis at the base of Dermatemydidae. Either hypothesis is made more meaningful by the biogeographic and temporal patterns it explains and the character evolution it implies. The testudinoid hypothesis does not have much explanatory power because it suggests the isolated occurrence of a hinged testudinoid in the late Paleocene of North America that fortuitously shares numerous unusual characteristics (e.g., costiform processes, rib-like axillary processes, supernumerary musk glands) with unrelated, but contemporary turtles from North America. The dermatemydid hypothesis, on the other hand, embeds Cardichelyon rogerwoodi in the kinosternoid tree in a meaningful way because this turtle is placed in close association with Agomphus pectoralis or Hoplochelys crassa (Cope, 1888), two roughly coeval taxa from North America that happen to share the abovementioned characteristics. We therefore favor this hypothesis herein. |