PBDB Taxon

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Cardichelyon

Reptilia - Testudines - Kinosternoidea

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).

Species

C. rogerwoodi

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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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria

Rank	Name	Author
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
—	Sauropsida
class	Reptilia
—	Testudinata	(Oppel 1811)
order	Testudines	Batsch 1788
suborder	Cryptodira
superfamily	Trionychoidea	Fitzinger 1826
family	Kinosternoidea	()
—	Pandermatemys	Joyce et al. 2004
family	Dermatemydidae	Baur 1888
genus	Cardichelyon

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.

G. †Cardichelyon Hutchison 2013

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†Cardichelyon rogerwoodi Hutchison 2013

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.

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

brackish, freshwaterf

Locomotion:

actively mobilec

Life habit:

aquaticf

Diet:

herbivoref

Reproduction:

oviparousf

Created:

2005-08-26 14:32:01

Modified:

2005-08-26 16:32:01

Source: f = family, c = class, subp = subphylum

References: Carroll 1988, Hendy et al. 2009, Uetz 2005

Age range: base of the Tiffanian to the top of the Clarkforkian or 61.70000 to 54.90000 Ma

Collections (33 total)

Time interval	Ma	Country or state	Original ID and collection number
Tiffanian	61.7 - 56.8	USA (Colorado)	C. rogerwoodi (174227)
Tiffanian	61.7 - 56.8	USA (Wyoming)	Ptychogaster sp. (15049)
Clarkforkian	56.2 - 54.9	USA (Wyoming)	C. rogerwoodi (15091 15095 15155 15157) C. sp. (164513 164514 164515 164516 164517 164518 164519) Ptychogaster sp. (15093)
Clarkforkian	56.2 - 54.9	USA (Colorado)	C. rogerwoodi (176832)
Wasatchian	55.8 - 50.3	USA (Colorado)	C. rogerwoodi (176840)
Wasatchian	55.8 - 50.3	USA (Wyoming)	C. rogerwoodi (15489 15512 15520 15523 15529 15530 15783 168296 168305 168306 168311 168313 168316 168317 168340) Emydidae indet. C (15488 59895)