Brachyuranochampsa Knowpia

Brachyuranochampsa; Temporal range: Middle Eocene, 56–33.9 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Archosauromorpha
Clade:	Archosauriformes
Order:	Crocodilia
Genus:	†Brachyuranochampsa; Zangerl, 1944
Species
	†B. eversolei Zangerl, 1944 (type);

Brachyuranochampsa is an extinct genus of crocodilian.

The only robust occurrence of Brachyuranochampsa is B. eversolei from the Middle Eocene of Wyoming.^[1] Another species, B. zangerli from the lower Bridger Formation at Grizzly Buttes, has been synonymized with another primitive crocodilian, "Crocodylus" affinis, also known from the Bridger Formation.^[2]^[3]

Phylogenetic studies have consistently recovered Brachyuranochampsa as more basal than the crown group Crocodylidae, which consists of all extant (living) crocodiles.^[2]^[4]

The below cladogram from a 2018 study combining morphological data and molecular DNA evidence shows the placement of Brachyuranochampsa within Crocodylia.^[5]

Crocodylia

Alligatoroidea

Prodiplocynodon†

Asiatosuchus germanicus†

"Crocodylus" affinis†

"Crocodylus" depressifrons†

	"Crocodylus" acer†

	Brachyuranochampsa eversolei†

Mekosuchinae

Longirostres

Crocodyloidea

	"Crocodylus" megarhinus†

	Crocodylidae

Gavialoidea

extinct basal Gavialoids†

Gavialidae

	Gavialis

	Tomistoma

References edit

^ Zangerl, R. (1944). Brachyuranochampsa eversolei, gen. et sp. nov., a new crocodilian from the Washakie beds of Wyoming. Annals of Carnegie Museum, 30:77-84
^ ^a ^b Brochu, C. A. (1997). "Morphology, fossils, divergence timing, and the phylogenetic relationships of Gavialis". Systematic Biology. 46 (3): 479–522. doi:10.1093/sysbio/46.3.479.
^ Brochu, C. A. (2000). "Phylogenetic relationships and divergence timing of Crocodylus based on morphology and the fossil record". Copeia. 2000 (3): 657–673. doi:10.1643/0045-8511(2000)000[0657:pradto]2.0.co;2.
^ Brochu, C. A.; Storrs, G. W. (2012). "A giant crocodile from the Plio-Pleistocene of Kenya, the phylogenetic relationships of Neogene African crocodylines, and the antiquity of Crocodylus in Africa". Journal of Vertebrate Paleontology. 32 (3): 587. doi:10.1080/02724634.2012.652324.
^ Michael S. Y. Lee; Adam M. Yates (27 June 2018). "Tip-dating and homoplasy: reconciling the shallow molecular divergences of modern gharials with their long fossil". Proceedings of the Royal Society B. 285 (1881). doi:10.1098/rspb.2018.1071. PMC 6030529. PMID 30051855.

External links edit

Brachyuranochampsa in the Paleobiology Database

[1] Zangerl, R. (1944). Brachyuranochampsa eversolei, gen. et sp. nov., a new crocodilian from the Washakie beds of Wyoming. Annals of Carnegie Museum, 30:77-84

[Brochu1997-2] Brochu, C. A. (1997). "Morphology, fossils, divergence timing, and the phylogenetic relationships of Gavialis". Systematic Biology. 46 (3): 479–522. doi:10.1093/sysbio/46.3.479.

[BCA00-3] Brochu, C. A. (2000). "Phylogenetic relationships and divergence timing of Crocodylus based on morphology and the fossil record". Copeia. 2000 (3): 657–673. doi:10.1643/0045-8511(2000)000[0657:pradto]2.0.co;2.

[BS12-4] Brochu, C. A.; Storrs, G. W. (2012). "A giant crocodile from the Plio-Pleistocene of Kenya, the phylogenetic relationships of Neogene African crocodylines, and the antiquity of Crocodylus in Africa". Journal of Vertebrate Paleontology. 32 (3): 587. doi:10.1080/02724634.2012.652324.

[LeeYates2018-5] Michael S. Y. Lee; Adam M. Yates (27 June 2018). "Tip-dating and homoplasy: reconciling the shallow molecular divergences of modern gharials with their long fossil". Proceedings of the Royal Society B. 285 (1881). doi:10.1098/rspb.2018.1071. PMC 6030529. PMID 30051855.

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Summary

References edit

External links edit