New Remains of Condorchelys antiqua (Testudinata) from the Early-Middle Jurassic of Patagonia: Anatomy, Phylogeny, and Paedomorphosis in the Early Evolution of Turtles

  title={New Remains of Condorchelys antiqua (Testudinata) from the Early-Middle Jurassic of Patagonia: Anatomy, Phylogeny, and Paedomorphosis in the Early Evolution of Turtles},
  author={Juliana Sterli and Marcelo de la Fuente and Guillermo W. Rougier},
  journal={Journal of Vertebrate Paleontology},
ABSTRACT New cranial and postcranial remains of the Early–Middle Jurassic turtle, Condorchelys antiqua, are described here in detail, providing new insights into the early evolution of turtles. Unconstrained and constrained cladistic analyses in addition to newly developed total-evidence Bayesian analysis were performed to explore large-scale turtle relationships and evolutionary trends. All the analyses show a similar resolution at the base of the tree, recovering several species of small… 

A reevaluation of the basal turtle Indochelys spatulata from the Early–Middle Jurassic (Toarcian–Aalenian) of India, with descriptions of new material

The phylogenetic analysis affirms the placement of Indochelys spatulata as a basal mesochelydian, but cannot resolve its relationships relative to the roughly coeval Condorchelys antiqua and Kayentachelys aprix.

Appearances can be deceptive: bizarre shell microanatomy and histology in a new Triassic turtle (Testudinata) from Argentina at the dawn of turtles

The origin and homology of the turtle shell is one of the most captivating topics in amniote evolution. In this contribution, we present a new species of turtle from the Late Triassic of Argentina

The Making of Calibration Sausage Exemplified by Recalibrating the Transcriptomic Timetree of Jawed Vertebrates

The present work reevaluate all thirty calibrations in detail, present the current state of knowledge on them with its various uncertainties, rerun the dating analysis, and conclude that calibration dates cannot be taken from published compendia or other secondary or tertiary sources without risking strong distortions to the results.

What do ossification sequences tell us about the origin of extant amphibians?

Analysis of the cranial data support a monophyletic origin among lepospondyls; a monophical origin among temnosponyls, the current near-consensus, is a distant second; all other hypotheses are exceedingly unlikely according to the data.

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Turtles have a highly modified body plan, including a rigid shell that constrains postcranial anatomy. Skull morphology and neck mobility may therefore be key to ecological specialization in turtles.

Turtle body size evolution is determined by lineage-specific specializations rather than global trends

Organisms display considerable variety of body sizes and shapes, and macroevolutionary investigations help to understand the evolutionary dynamics behind to such variations. Turtles (Testudinata)

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It is suggested that tympanic hearing in turtles evolved as a compromise between subaerial and underwater hearing, and that middle ear cavity shape may be controlled by factors unrelated to hearing, such as the spatial demands of surrounding cranial structures.

Changes in the Diversity of Turtles (Testudinata) in South America from the Late Triassic to the Present

Abstract. Recent advances in the fossil record, anatomy, and evolutionary history of South American turtles allow a thorough analysis of their changes in diversity, and to identify several major



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It is demonstrated here that, by documenting yet unknown stages in the evolution of several morphological structures, these three species give stronger support to the model of an extended phylogenetic stem for turtles.

A new stem turtle from the Middle Jurassic of Scotland: new insights into the evolution and palaeoecology of basal turtles

A phylogenetic analysis places the new taxon within the stem group of Testudines (crown-group turtles) and suggests a sister-group relationship between E. waldmani and Heckerochelys romani from the Middle Jurassic of Russia.

A new platychelyid turtle (Pan‐Pleurodira) from the Late Jurassic (Kimmeridgian) of Oaxaca, Mexico

Until recently, the record of Mesozoic turtles in Mexico has been restricted to the Cretaceous. New discoveries in the Sabinal Formation (Tlaxiaco, Oaxaca) have extended the record into the

A new turtle from the Palaeogene of Patagonia (Argentina) sheds new light on the diversity and evolution of the bizarre clade of horned turtles (Meiolaniidae, Testudinata)

A new species of horned turtle from the Paleogene of Patagonia that sheds new light on the evolution and palaeobiogeographical history of the clade Meiolaniidae in Australasia and South America during the Cainozoic is presented.

A toothed turtle from the Late Jurassic of China and the global biogeographic history of turtles

A revision of the global distribution of fossil and recent turtle reveals that the three primary lineages of derived, aquatic turtles, including the crown, Paracryptodira, Pan-Pleurodira, and Pan-Cryptodira can be traced back to the Middle Jurassic of Euramerica, Gondwana, and Asia, respectively, which resulted from the primary break up of Pangaea at that time.

Total evidence analysis and body size evolution of extant and extinct tortoises (Testudines: Cryptodira: Pan‐Testudinidae)

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  • Biology, Environmental Science
    Cladistics : the international journal of the Willi Hennig Society
  • 2018
Phylogenetic placement of fossils demonstrates that giant body size independently evolved in multiple continental mainland taxa and confirms recent results deduced from living taxa—giantism in Testudinidae is not linked to the insular effect.

The skeletal morphology of the solemydid turtle Naomichelys speciosa from the Early Cretaceous of Texas

The full visibility of the parabasisphenoid complex in ventral view, the presence of an expanded symphyseal shelf, and the unusual ventromedial folding of the coronoid process are the primary characteristics that distinguish Naomichelys speciosa from the near-coeval European taxon Helochelydra nopcsai.

The cranial morphology of Kayentachelys, an Early Jurassic cryptodire, and the early history of turtles

Kayentachelys reveals what a primitive cryptodire would be expected to look like: a combination of primitive and derived characters, with the fewer derived characters providing the best test of its relationships to other turtles.

A new, nearly complete stem turtle from the Jurassic of South America with implications for turtle evolution

  • J. Sterli
  • Environmental Science, Geography
    Biology Letters
  • 2008
An updated cladistic analysis of turtles shows that C. antiqua and other fossil turtles are not crown turtles, but stem turtles, and that until the Middle to Upper Jurassic there were turtles without the modern jaw closure mechanism.

The cranial anatomy of the Early Jurassic turtle Kayentachelys aprix

The fossil turtle Kayentachelys aprix is known from Early Jurassic sediments of the Kayenta Formation, Arizona, USA. The detailed description of this taxon’s cranium offered in this paper