New choristoderes (Reptilia: Diapsida) from the Upper Cretaceous and Palaeocene, Alberta and Saskatchewan, Canada, and phylogenetic relationships of Choristodera

Gao, Ke‐Qin; Fox, Richard C.

doi:10.1111/j.1096-3642.1998.tb00580.x

Cited by 52 publications

(67 citation statements)

References 27 publications

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“…1), gavialiform reptiles with cordiform skulls, long rostra, and short necks. All recent analyses support the placement of these four genera in a clade, Neochoristodera (Evans and Manabe, 1999;Gao and Fox, 1998;Matsumoto et al, 2007Matsumoto et al, , 2009Skutchas, 2008). The more basal 'non-neochoristoderes' are smaller (0.3-1.0m) and more diverse in their morphology.…”

Section: Introductionmentioning

confidence: 88%

“…Putative records of non-neochoristoderes are limited to the Oldman and the Dinosaur Park formations, Alberta (Irvine locality and Dinosaur Provincial Park). These small specimens were assigned to Cteniogenys (Gao and Fox, 1998), but the material (incomplete dentaries and maxillae) is not sufficiently complete or diagnostic for generic identification (Matsumoto et al, 2009), especially with such a large age gap.…”

Section: Upper Cretaceousmentioning

confidence: 99%

“…Small incomplete choristoderan jaw elements have been reported from the Oldman and the Dinosaur Park formations of Alberta, Canada, in association with Champsosaurus and Leidyosuchus (Brinkman, 1990;Gao and Brinkman, 2005;Gao and Fox, 1998) The affinities of these specimens (e.g. UALVP29794; UALVP29795) are uncertain, but the reptiles from which they came, if adult, would have been of similar size to Portuguese (Guimarota) specimens of Cteniogenys (e.g.…”

Section: Paleocene-eocenementioning

confidence: 99%

“…Choristoderes have been found across Laurasia, from Japan in the east to Alberta in the west (e.g. Evans and Hecht 1993;Gao and Fox, 1998;Matsumoto et al, 2007Matsumoto et al, , 2009 in deposits ranging in age from Middle Jurassic to Miocene. However, despite the improvement in the record, the position of choristoderes within Diapsida remains uncertain.…”

Section: Introductionmentioning

confidence: 99%

“…DeBraga and Rieppel, 1997), of Archosauromorpha +Lepidosau-romorpha (e.g. Evans, 1988;Gao and Fox, 1998;Dilkes, 1998), or of Euryapsida within an expanded Lepidosauromorpha (e.g. Müller, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Choristoderes and the freshwater assemblages of Laurasia

Matsumoto¹,

Evans²

2010

J. iber. geol.

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Choristoderes are freshwater aquatic diapsid reptiles of uncertain phylogenetic position. Although the lineage probably diverged from other diapsids in the Permo-Triassic, choristoderes apparently never reached Gondwana. Within Laurasia, however, they have been recovered from Japan, China, Mongolia, Trans-Baikal Russia, Central Asia, Western Europe, and North America, reaching extreme northern latitudes. Setting aside controversial Triassic records, their known temporal range currently extends from the Middle Jurassic (Britain, Kyrgyzstan) to the Miocene (Czech Republic). However, although small choristoderes are known to span the entirety of this period, the larger, more derived neochoristoderes are recorded only from the Early Cretaceous through to the earliest Eocene. The gavial-like neochoristodere Champsosaurus is the most familiar taxon, characterised by large size, a long rostrum and flared temporal fenestrae, but research over the last three decades has revealed many new genera and exposed an unexpected diversity in terms of body size (small to relatively large), neck length (long v. short) and skull morphology (longirostrine v. brevirostrine, open v. closed lower temporal fenestrae). Typically choristoderes occur as part of a mesic assemblage that includes fish, lizards, mammals, turtles, frogs, salamanders, small dinosaurs and, usually, crocodiles. At maturity, Jurassic choristoderes were generally smaller than co-occuring crocodiles and were relatively unspecialized postcranially. The Early Cretaceous of Asia saw a dramatic diversification of choristoderes, including the appearance of much larger neochoristoderes. Perhaps significantly, the relevant Asian horizons (e.g. Yixian Formation, China; Okurodani and Kuwajima formations, Japan) yield no crocodiles. In Late Cretaceous and Paleogene horizons however, across Euramerica, large gavial-like neochoristoderes came to share freshwater ecosystems with a diversity of crocodiles, the neochoristoderes apparently occupying a specialist (gavial-like) piscivorous niche as long as it was available and resources were adequate.

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Section: Introductionmentioning

confidence: 88%

Section: Upper Cretaceousmentioning

confidence: 99%

Section: Paleocene-eocenementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Choristoderes and the freshwater assemblages of Laurasia

Matsumoto¹,

Evans²

2010

J. iber. geol.

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Anatomy informs geology: Hydrodynamic dispersal of alligator bones, with implications for taphonomic interpretations of fossil deposits of crocodylians, dinosaurs, and other morphologically novel taxa

Blob

Espinoza²,

Iijima

2022

The Anatomical Record

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Distinctive anatomical features of bones can influence not only how these structures perform in living animals but also the tendency of elements to be transported by flowing water after death. Such transport can be critical in the concentration of fossils from animals that live near freshwater habitats, providing important context for interpreting the composition of paleocommunities. Measurements of the tendency of flowing water to disperse skeletal elements have been collected for diverse taxa, including mammals, turtles, and birds. However, these extant models may not be entirely appropriate for many morphologically distinct extinct lineages, such as non‐avian dinosaurs. To expand the range of models available for evaluating the influence of hydrodynamic transport on the assembly of fossil deposits, we used a flow tank to measure the water speeds that disperse bones from a subadult American alligator (Alligator mississippiensis), with the skull and mandible tested in multiple starting orientations. Alligator bones are sorted into three main dispersal groups: early (vertebrae, most girdle elements), intermediate (ribs, most limb bones), and late (pubis, femur), with the skull and mandible varying between intermediate and late depending on orientation. Late dispersing elements tended to be heavy or very flat. These results can refine interpretations of the taphonomic context for deposits of fossil crocodylians and morphologically similar taxa (e.g., choristoderes, phytosaurs) and provide an additional comparative model for deposits of non‐avian dinosaurs. Moreover, variation in hydrodynamic sorting across lineages highlights how distinctive anatomical features can influence the concentration of fossils, shaping understanding of assemblage composition and paleofaunal evolution.

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First Jurassic Choristodera from Asia

Averianov

Martin

Evans

et al. 2005

Naturwissenschaften

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Although choristoderes have a good Lower Cretaceous record in Asia, they have never previously been recorded from Jurassic deposits. Here we describe fragmentary vertebral material referable to Choristodera indet. from the Middle Jurassic Balabansai Svita of the Fergana Valley, Kyrgyzstan. This provides a significant range extension for the group in Asia and shows that choristoderes already had a Pan-Laurasian distribution in the Jurassic.

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New choristoderes (Reptilia: Diapsida) from the Upper Cretaceous and Palaeocene, Alberta and Saskatchewan, Canada, and phylogenetic relationships of Choristodera

Cited by 52 publications

References 27 publications

Choristoderes and the freshwater assemblages of Laurasia

Choristoderes and the freshwater assemblages of Laurasia

Anatomy informs geology: Hydrodynamic dispersal of alligator bones, with implications for taphonomic interpretations of fossil deposits of crocodylians, dinosaurs, and other morphologically novel taxa

First Jurassic Choristodera from Asia

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