An alternative interpretation of the Paleogene turtle <i>Cardichelyon rogerwoodi</i> as a hinged kinosternoid

Joyce, Walter G.; Julien, Claude

doi:10.1017/jpa.2019.92

Cited by 9 publications

(13 citation statements)

References 32 publications

(65 reference statements)

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“…Composition-A number of fossil forms from the Cenozoic of Asia have been attributed to Platysternidae over the course of the last decades (e.g., Chkhikvadze 1989;Danilov et al 2017), but the relevant fossils remain poorly figured. The Paleocene Cardichelyon rogerwoodi from North America has similarly been suggested more recently to be a platysternid as well (Hutchison 2013), but a more recent assessment suggests kinosternoid affinities instead (Joyce and Claude 2020). Not established phylogenetic definitions-Panplatysternon Joyce et al, 2004.…”

Section: Pan-deirochelyinaementioning

confidence: 99%

A nomenclature for fossil and living turtles using phylogenetically defined clade names

Joyce

Anquetin²,

Cadena

et al. 2021

Swiss J Palaeontol

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Over the last 25 years, researchers, mostly paleontologists, have developed a system of rank-free, phylogenetically defined names for the primary clades of turtles. As these names are not considered established by the PhyloCode, the newly created nomenclatural system that governs the naming of clades, we take the opportunity to convert the vast majority of previously defined clade names for extinct and extant turtles into this new nomenclatural framework. Some previously defined names are converted with minor adjustments. We also define a number of new clade names to close apparent nomenclatural gaps. In total, we establish 113 clade names, of which 79 had already received phylogenetic definitions and 34 are new.

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Section: Pan-deirochelyinaementioning

confidence: 99%

A nomenclature for fossil and living turtles using phylogenetically defined clade names

Joyce

Anquetin²,

Cadena

et al. 2021

Swiss J Palaeontol

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“…Chelydroidea was the focal clade because miniaturization is relatively well documented in fossil and living species, particularly in conjunction with the diversification of the mud and musk turtles (Kinosternidae) during the late Cretaceous and early Eocene of North America (Joyce & Claude, 2020). The standard proxy used to estimate adult body size in turtles is maximum carapace length (CL).…”

Section: Methodsmentioning

confidence: 99%

“…Perhaps the starkest phyletic decrease in body size in turtle evolution occurred across marine species (Chelonioidea) and their freshwater relatives. A major bifurcation event in the late Cretaceous initially gave rise to a group of large to medium‐sized freshwater species (Chelydroidea) (Joyce & Bourque, 2016; Joyce & Claude, 2020), whose descendants are presently found in shallow‐water habitats of North and South America (Ernst & Lovich, 2009; Legler & Vogt, 2013). Thus, the first aim of this study was to reconstruct evolutionary transitions to miniaturization in the Chelydroidea clade (Figure 1a,b).…”

Section: Introductionmentioning

confidence: 99%

Disentangling the correlated evolution of body size, life history, and ontogeny in miniaturized chelydroid turtles

Cordero

2021

Evolution and Development

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Organismal miniaturization is defined by a reduction in body size relative to a large ancestor. In vertebrate animals, miniaturization is achieved by suppressing the energetics of growth. However, this might interfere with reproductive strategies in egg‐laying species with limited energy budgets for embryo growth and differentiation. In general, the extent to which miniaturization coincides with alterations in animal development remains obscure. To address the interplay among body size, life history, and ontogeny, miniaturization in chelydroid turtles was examined. The analyses corroborated that miniaturization in the Chelydroidea clade is underlain by a dampening of the ancestral growth trajectory. There were no associated shifts in the early sequence of developmental transformations, though the relative duration of organogenesis was shortened in miniaturized embryos. The size of eggs, hatchlings, and adults was positively correlated within Chelydroidea. A phylogenetically broader exploration revealed an alternative miniaturization mode wherein exceptionally large hatchlings grow minimally and thus attain diminutive adult sizes. Lastly, it is shown that miniaturized Chelydroidea turtles undergo accelerated ossification coupled with a ~10% reduction in shell bones. As in other vertebrates, the effects of miniaturization were not systemic, possibly owing to opposing functional demands and tissue geometric constraints. This underscores the integrated and hierarchical nature of developmental systems.

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“…To investigate the phylogenetic position of Chelydropsis aubasi sp. nov., we modified the chelydroid matrix of Joyce and Claude (2020), which in return is based on the matrices of Knauss et al (2011) and Lyson et al (2017). The matrix was expanded to include Chelydropsis aubasi sp.…”

Section: Phylogenetic Analysismentioning

confidence: 99%

A pan‐chelydrid, Chelydropsis aubasi sp. nov., from the Middle Eocene (MP 15, early Bartonian) of Chéry‐Chartreuve, France

Joyce

Landréat²,

Rollot

2022

The Anatomical Record

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Snapping turtles (Pan‐Chelydridae) play an important role in modern ecosystems throughout North America, but their fossil record is notably poor. We here describe a new species of fossil pan‐chelydrid, Chelydropsis aubasi, from the Middle Eocene (MP15, Bartonian) of Chéry‐Chartreuve, Department of Aisne, France, based on a series of fragments that document most of the shell. The new species not only bridges the morphological gap between earlier pan‐chelydrids from North America and later pan‐chelydrids from Europe but also advances the arrival of the group from North America to Europe by at least 10 million years. Although pan‐chelydrids are notably absent from Early and Middle Eocene localities throughout Europe, the new fossil gives credence to the idea that pan‐chelydrids may have dispersed from North America to Europe in concert with other turtles during the Paleocene–Eocene Thermal Maximum, but remain undetected to date.

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An alternative interpretation of the Paleogene turtle Cardichelyon rogerwoodi as a hinged kinosternoid

Cited by 9 publications

References 32 publications

A nomenclature for fossil and living turtles using phylogenetically defined clade names

A nomenclature for fossil and living turtles using phylogenetically defined clade names

Disentangling the correlated evolution of body size, life history, and ontogeny in miniaturized chelydroid turtles

A pan‐chelydrid, Chelydropsis aubasi sp. nov., from the Middle Eocene (MP 15, early Bartonian) of Chéry‐Chartreuve, France

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