Evidence of thalattosuchian crocodylomorphs in the Portland Stone Formation (Late Jurassic) of England, and a discussion on Cretaceous teleosauroids

  title={Evidence of thalattosuchian crocodylomorphs in the Portland Stone Formation (Late Jurassic) of England, and a discussion on Cretaceous teleosauroids},
  author={Mark T. Young and Sven Sachs},
  journal={Historical Biology},
  pages={1473 - 1476}
  • M. YoungS. Sachs
  • Published 2 January 2020
  • Geography, Environmental Science
  • Historical Biology
ABSTRACT We report the first definite specimen of a thalattosuchian crocodylomorph from the Portland Stone Formation of England. This specimen (an isolated tooth crown) can be referred to the teleosauroid genus Machimosaurus based on its conical shape, distinctive enamel ornamentation and lack of carinae. Understanding the faunal composition of the Portland Stone Formation is key to elucidating the distinct shift in crocodylomorph taxa that occurred during the Tithonian-to-Berriasian in Europe… 

Evidence of two lineages of metriorhynchid crocodylomorphs in the Lower Cretaceous of the Czech Republic

Metriorhynchid crocodylomorphs were an important component in shallow marine ecosystems during the Middle Jurassic to Early Cretaceous in the European archipelago. While metriorhynchids are well

On the validity of the British Upper Jurassic turtle “Pleurosternon portlandicum” (Paracryptodira, Pleurosternidae)

Pleurosternidae is a clade of North American and European Mesozoic turtles known from the Late Jurassic to the Early Cretaceous. The knowledge about the European record of this group has

Emptying the wastebasket: a historical and taxonomic revision of the Jurassic crocodylomorph Steneosaurus

S. rostromajor is considered as a nomen dubium and proposed that the genus Steneosaurus is undiagnostic, which has profound implications for teleosauroid phylogenetics, which will be clarified in an upcoming paper.

Inner ear sensory system changes as extinct crocodylomorphs transitioned from land to water

The morphology of the vestibular system corresponds to habitat, with pelagic thalattosuchians exhibiting a more compact labyrinth with wider semicircular canal diameters and an enlarged vestibule, reminiscent of modified and miniaturized labyrinths of other marine reptiles and cetaceans.

Unexpected bite‐force conservatism as a stable performance foundation across mesoeucrocodylian historical diversity

Stasis reveals that mesoeucrocodylians with dietary ecologies as disparate as herbivory and hypercarnivory maintain similar bite-force-to-body-size relationships, a pattern which contrasts the precept that vertebrate bite forces should vary most strongly by diet.



Occurrence of Torvoneustes (Crocodylomorpha, Metriorhynchidae) in marine jurassic deposits of Oaxaca, Mexico

IGM 9026 is a singular fossil collected at the beginning of the 20th century in an improperly documented site within the Tlaxiaco Basin, near to Tlaxiaco town, Oaxaca, Mexico. The age of the site was

Revision of the Late Jurassic deep-water teleosauroid crocodylomorph Teleosaurus megarhinus Hulke, 1871 and evidence of pelagic adaptations in Teleosauroidea

It is hypothesised that the Bathysuchus + Aeolodon clade is the first known teleosauroid lineage that evolved a more pelagic lifestyle and has an extreme reduction in dermatocranial ornamentation and osteoderm size, thickness and ornamentation.

A new metriorhynchid crocodylomorph from the Lower Kimmeridge Clay Formation (Late Jurassic) of England, with implications for the evolution of dermatocranium ornamentation in Geosaurini

It is hypothesize that the ‘smooth’ dermatocranium of Late Jurassic metriorhynchids evolved independently in each subclade (parallel evolution), and would have reduced drag, thereby making locomotion through water more energy efficient.

Revision of the Late Jurassic teleosaurid genus Machimosaurus (Crocodylomorpha, Thalattosuchia)

It is concluded that there were three European Machimosaurus species and another taxon in Ethiopia, and it is hypothesize that Machimosaurs may have been analogous to the Pliocene–Holocene genus Crocodylus in having one large-bodied taxon suited to traversing marine barriers and additional, geographically limited taxa across its range.

A new freshwater teleosaurid from the Jurassic of northeastern Thailand

ABSTRACT The core of the fossil record of Teleosauridae, a family of thalattosuchian crocodylomorphs, is well known from western Tethyan marine deposits of the Jurassic. Outside this province, their

Marine reptiles from the Jurassic/Cretaceous transition at the High Andes, Mendoza, Argentina

Systematic revision of Sarcosuchus hartti (Crocodyliformes) from the Recôncavo Basin (Early Cretaceous) of Bahia, north-eastern Brazil

The Brazilian taxon differs from the African Sarcosuchus imperator in the unique pattern of anastomosing ornamentation observed on the enamel surface and is likely related to a cladogenesis event that resulted from the break-up of Gondwana.

Crocodilians from the lower Cretaceous (Berriasian) Purbeck Limestone Group of Dorset, southern England

A total of 13 species of crocodilians, representating nine genera, have been recognized from the Lower Cretaceous (Berriasian) Purbeck Limestone Group of Dorset, southern England. Of these taxa, only

The first definitive Middle Jurassic atoposaurid (Crocodylomorpha, Neosuchia), and a discussion on the genus T heriosuchus

This review of mandibular and dental features in atoposaurids not only allows us to present a revised diagnosis of T heriosuchus, but also reveals a great amount of variability within this genus, and indicates that there are currently five valid species that can be differentiated by unique combinations of dental characteristics.