The shell and pelvic anatomy of the Late Jurassic turtle Platychelys oberndorferi based on material from Solothurn, Switzerland

  title={The shell and pelvic anatomy of the Late Jurassic turtle Platychelys oberndorferi based on material from Solothurn, Switzerland},
  author={Patrick M. Sullivan and Walter G. Joyce},
  journal={Swiss Journal of Palaeontology},
Platychelys oberndorferi is a stem pleurodire from the Late Jurassic of Europe. The majority of informative specimens originate from the Late Jurassic (late Kimmeridgian) Turtle Limestones exposed north of the city of Solothurn, Switzerland, but these findings remain poorly documented despite their global importance for understanding the evolution of pleurodire turtles. The available material of this species from this locality currently consists of five shells, one of which is associated with… 

Cranial and post-cranial remains and phylogenetic relationships of the Gondwanan meiolaniform turtle Peligrochelys walshae from the Paleocene of Chubut, Argentina

The updated phylogenetic analysis confirms that P. walshae is part of the clade Meiolaniformes, which spans from the Early Cretaceous until the Holocene and contains the giant, horned turtles (Meiolaniidae), and reinforces the previous hypothesis that the cl cluster is dominated by Gondwanan taxa, but also includes some Laurasian representatives.

Shell Anomalies in the European Aquatic Stem Turtle Pleurosternon bullockii (Paracryptodira, Pleurosternidae)

The uppermost Jurassic to lowermost Cretaceous stem turtle Pleurosternon bullockii is the pleurosternid (Testudinata, Paracryptodira) known by the largest number of specimens worldwide, composing the

Interpreting character variation in turtles: Araripemys barretoi (Pleurodira: Pelomedusoides) from the Araripe Basin, Early Cretaceous of Northeastern Brazil

A great amount of morphological variation is reported, interpreted as being essentially of intraspecific nature, including individual, sexual and ontogenetic variation.


: The present study characterizes the morphological variability related to the sexual dimorphism in the shells of the Spanish Upper Cretaceous turtle Dortoka vasconica . This study is based on the

The giant pliosaurid that wasn’t: revising the marine reptiles from the Kimmeridgian (Upper Jurassic) of Krzyżanowice, Poland

Marine reptiles from the Upper Jurassic of Central Europe are rare and often fragmentary, which hinders their precise taxonomic identification and their placement in a palaeobiogeographic context.

The macroevolutionary and developmental evolution of the turtle carapacial scutes

It is argued that turtles with complete loss of scutes follow clade-specific macroevolutionary regimes, which are distinct from the majority of other turtles, and a parallel is drawn between the variation of scute patterns on the carapace of turtles and the scale patterns in the pileus region of squamates.

Shell variability in the stem turtles Proterochersis spp.

Presented data supplement the sparse knowledge of shell scute development in the earliest turtles and suggest that at least some aspects of the developmental programs governing scutes development were already similar in the Late Triassic to these of modern forms.

A new testudinoid turtle from the middle to late Eocene of Vietnam

This is the first time that a large sample of fossil testudinoids has its morphological variation described in detail and can be inferred with confidence to be a new taxon.

A new phylogenetic hypothesis of turtles with implications for the timing and number of evolutionary transitions to marine lifestyles in the group

A new phylogenetic hypothesis informed by high resolution computed tomographic data of living and fossil taxa is presented, indicating three independent evolutionary transitions to marine life in non‐pleurodiran turtles (plus an additional two‐three in pleurodires).



New Material of the Platychelyid Turtle Notoemys zapatocaensis from the Early Cretaceous of Colombia; Implications for Understanding Pleurodira Evolution

Phylogenetic analysis indicates that N. zapatocaensis is a sister taxon of N. oxfordiensis, and that Proterochersis robusta can be resolved in two different positions in the testudines tree: as the most basal pleurodire, based on a suture articulation of pelvis to shell.

The girdles of the oldest fossil turtle, Proterochersis robusta, and the age of the turtle crown

All current phylogenetic hypotheses support the basal placement of thisTaxon, imply that the sutured pelvis of this taxon developed independently from that of pleurodires, and conclude that the age of the turtle crown is Middle Jurassic.

Notoemys zapatocaensis, a New Side-Necked Turtle (Pleurodira: Platychelyidae) from the Early Cretaceous of Colombia

Reanalysis based on morphology of the new shell suggests that Notoemys is the sister taxon to the late Jurassic European Platychelys based on the common possession of a very large costovertebral tunnel, tubercle on anterior margin of first thoracic rib, wide, flatThoracic ribs, and a first thorACic centrum that is wider than high.

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

Chubutemys, a New Eucryptodiran Turtle from the Early Cretaceous of Argentina, and the Relationships of the Meiolaniidae

Chubutemys copelloi is the oldest nonmarine cryptodire from South America represented by a skull and an enclosed canalis caroticus internus extending to the posterior margin of the pterygoid, showing that it is a eucryptodire.

Conserved bone microstructure in the shells of long-necked and short-necked chelid turtles (Testudinata, Pleurodira)

Character mapping indicates that the hypothesis of clades based on neck length is supported by two synapomorphies and one less tree step in contrast to the molecular-based separation based on geographic distribution, which indicates South American and Australasian chelids are monophyletic, regardless of neck-length.

A Review of the Fossil Record of Turtles of the Clades Platychelyidae and Dortokidae

The fossil record of platychelyid turtles expands from the Late Jurassic (Oxfordian) of Cuba to the Early Cretaceous (Valanginian) of Colombia, suggesting that these turtles are situated along the stem lineage of crown Pleurodira.

A Jurassic stem pleurodire sheds light on the functional origin of neck retraction in turtles

The neck of Platychelys oberndorferi is described, a Late Jurassic early stem pleurodire, and remarkable convergent morphological and functional similarities with modern cryptodires are found, suggesting that complete head withdrawal for protection may have resulted from an exaptation in that group.

Shell bone histology indicates terrestrial palaeoecology of basal turtles

  • T. ScheyerP. M. Sander
  • Environmental Science, Geography
    Proceedings of the Royal Society B: Biological Sciences
  • 2007
This study presents independent shell bone microstructural evidence for a terrestrial habitat of the oldest and basal most well-known turtles, i.e. the Upper Triassic Proterochersis robusta and Proganochelys quenstedti, and shows congruence with terrestrial turtle taxa.