J. Sterli et al. 2019

Full reference
J. Sterli, M. S. de la Fuente, and G. W. Rougier. 2019. New remains of Condorchelys antiqua (Testudinata) from the Early-Middle Jurassic of Patagonia: anatomy, phylogeny, and paedomorphosis in the early evolution of turtles. Journal of Vertebrate Paleontology e1480112:1-17 [E. Vlachos/E. Vlachos]
Metadata
ID number:  68328
Created:  2019-03-26 13:14:36
Publication type:  journal article
Taxonomy:  stated with evidence
Language:  English
DOI:  10.1080/02724634.2018.1480112
Comments: 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-sized, fresh water turtles of the Early–Middle Jurassic at the base of the tree following the most basal, large-sized, terrestrial turtles from the Late Triassic. The calibration of the cladistic analyses and the tip-dating analysis provided similar results in the main nodes Testudines, Pan-Cryptodira, Cryptodira, Pan-Pleurodira, and Pleurodira, corroborating that the Jurassic is a key period for turtle evolution. The significant reduction in size in Early–Middle Jurassic stem turtles and the combination of certain characters (e.g., presence of fontanelles, loss of bones, loss of scutes) shown by those taxa suggests heterochronic changes, paedomorphosis in particular, at the base of the turtle tree. These morphological novelties could have trigged, or facilitated, the occupation of the aquatic niche as seen in Jurassic stem turtles.
Taxonomic opinions (3) - view classification
'Condorchelys antiqua belongs to Condorchelys' according to J. Sterli et al. 2019
'Condorchelys belongs to Mesochelydia' according to J. Sterli et al. 2019
'Mesochelydia belongs to Testudinata' according to J. Sterli et al. 2019