Triassic turtle tracks and the origin of turtles

  title={Triassic turtle tracks and the origin of turtles},
  author={Asher Lichtig and Spencer G. Lucas and Hendrik Klein and David M. Lovelace},
  journal={Historical Biology},
  pages={1112 - 1122}
Abstract Turtle (Testudines) tracks, Chelonipus torquatus, reported from the early Middle Triassic (Anisian) of Germany, and Chelonipus isp. from the late Early Triassic (Spathian) of Wyoming and Utah, are the oldest fossil evidence of turtles, but have been omitted in recent discussions of turtle origins. These tracks provide significant clues as to how early the turtle Bauplan originated. Turtle trackways are quite distinctive: the manus and pes form tracks nearly parallel to the midline and… 

Chinlechelys from the Upper Triassic of New Mexico, USA, and the origin of turtles

The morphology of Chinlechelys tenertesta supports the placement of Testudines outside of crown Sauria, as a taxon derived from pareiasaurs based on the morphology of the dorsal osteoderms and skull roof and reaffirm its unequivocal support for the composite model of costal bone formation in turtles.

New fossil sea turtle trackway morphotypes from the Pleistocene of South Africa highlight role of ichnology in turtle paleobiology

Abstract More than 130 late Pleistocene trackway sites from the coastal eolianites and beach deposits of the Cape south coast, South Africa, have previously mostly yielded tracks of large mammals and

Bromalites from a turtle-dominated fossil assemblage from the Triassic of Poland

Lower Cretaceous turtle tracks from Hekou Group of Northwest China

A diverse Late Cretaceous vertebrate tracksite from the Winton Formation of Queensland, Australia

The Snake Creek Tracksite reconciles the sauropod-, crocodyliform-, turtle-, and lungfish-dominated body fossil record of the ‘upper’ Winton Formation with its heretofore ornithopod- and theropod-dominated ichnofossil record.



A Review of the Fossil Record of Basal Mesozoic Turtles

  • W. Joyce
  • Environmental Science, Geography
    Bulletin of the Peabody Museum of Natural History
  • 2017
Sedimentological, anatomical, and histological data universally hint at terrestrial habitat preference among the earliest stem turtles, but a more mixed, though unambiguously continental signal is apparent further towards the crown.

An ancestral turtle from the Late Triassic of southwestern China

A new 220-million-year-old turtle from China is described that documents an intermediate step in the evolution of the shell and associated structures and shows that the turtle shell is not derived from a fusion of osteoderms.

A Middle Triassic stem-turtle and the evolution of the turtle body plan

A new reptile, Pappochelys, is reported that is structurally and chronologically intermediate between Eunotosaurus and Odontochelys and dates from the Middle Triassic period (∼240 million years ago), providing new evidence that the plastron partly formed through serial fusion of gastralia.

Evolutionary Origin of the Turtle Shell

Turtles as diapsid reptiles

The result robustly supports the diapsid affinities of turtles, and so requires reassessment of the use of turtles as 'primitive' reptiles in phylogenetic reconstruction, and illustrates the difficulties of treating groups that have extant members with peculiar morphologies that mask phylogenetic affinity.

Turtle tracks from the Late Jurassic of Asturias, Spain

Although tracks of dinosaurs are well known from Upper Jurassic sediments, tracks of non−dinosaurian vertebrates are fairly rare. The Upper Jurassic Lastres Formations of Asturias in northern Spain

Transitional fossils and the origin of turtles

This work reanalysed a recent dataset that allied turtles with the lizard–tuatara clade and found that the inclusion of the stem turtle Proganochelys quenstedti and the ‘parareptile’ Eunotosaurus africanus results in a single overriding morphological signal, with turtles outside Diapsida.

Turtle and pterosaur tracks from the Los Cayos Dinosaur Tracksite, Cameros Basin (Cornago, La Rioja, Spain): tracking the Lower Cretaceous bio-diversity

New fossil turtle and pterosaurian tracks have been found at the Los Cayos locality (Cornago township, La Rioja province, Spain). The Los Cayos tracksite is situated in the Cameros Basin, ant it is

Revision of the Triassic European turtles Proterochersis and Murrhardtia (Reptilia, Testudinata, Proterochersidae), with the description of new taxa from Poland and Germany

New discovered plesiomorphic aspects of the anatomy of these three species included in the phylogenetic analysis demonstrate that they are not only the oldest, but are also the most basal fully shelled turtles.

A thin-shelled reptile from the Late Triassic of North America and the origin of the turtle shell

The novel observations of Chinlechelys tenertesta lend support to the hypothesis that the turtle shell was originally a complex composite in which dermal armour fused with the endoskeletal ribs and vertebrae of an ancestral lineage instead of forming de novo.