请输入您要查询的百科知识：

　

词条 Phosphatosaurus
释义

  1. Description

  2. Classification

     Phylogenetics 

  3. References

  4. External links

{{Automatic taxobox
| fossil_range = Early Eocene, {{fossil range|48.6|earliest=70.6|PS=(ghost lineage extends from Maastrichtian)[1]}}
| taxon = Phosphatosaurus
| authority = Bergounioux, 1955
| subdivision_ranks = Species
| subdivision =
  • {{extinct}}P. gavialoides Bergounioux, 1955 (type)

}}Phosphatosaurus is an extinct genus of dyrosaurid crocodylomorph. It existed during the early Eocene, with fossils having been found from North Africa in Tunisia and Mali. Named in 1955, Phosphatosaurus is a monotypic genus; the type species is P. gavialoides.[2] A specimen has been discovered from Niger, but it cannot be classified at the species level.[3]Phosphatosaurus is closely related to the Cretaceous genus Sokotosuchus, which is known from Niger and Mali. Because Phosphatosaurus is only known from Paleogene localities, the close relationship with Sokotosuchus implies that there is a long ghost lineage extending back into the Maastrichtian that is not known in the fossil record.[4]

Description

Phosphatosaurus is a large-bodied dyrosaurid with blunt teeth.[1][2][5] The tip of the snout is spoon-shaped from a lateral expansion of the rostral portion of the mandible. The dentition is nonhomodont. Alveolar "couplets" are present in the lower jaw of Phosphatosaurus in which paired tooth sockets, or alveoli, are closer to one another than to the alveoli next to them. This is not seen in any other dyrosaurid but is seen in some other longirostrine (long snouted) crocodylomorphs such as the gavialoid Eosuchus.[6] It is possible that the diastemata between the couplets served to receive larger maxillary teeth.[1]

Classification

Phosphatosaurus was assigned in 1979 to the newly named subfamily Phosphatosaurinae by Eric Buffetaut, who considered the subfamily to be the clade formed by Phosphatosaurus and the closely related Sokotosaurus.[7] However, other authors of more recent studies have been tentative in considering the taxon valid because there is currently little knowledge of the anatomy of either genus.[5]

Phylogenetics

Phylogenetic position of Phosphatosaurus
title=Buffetaut 1978[8]style=font-size:80%;line-height:80%label1=Dyrosauridae 1={{clade1=Phosphatosaurus2={{clade1=Rhabdognathus2={{clade1=Hyposaurus2=Dyrosaurus

}} }} }} }}


}}
title=Jouve 2005[9]style=font-size:80%;line-height:80%label1=Dyrosauridae 1={{clade1=Sokotosuchus2=Phosphatosaurus3={{clade1=Dyrosaurus2={{clade1=Hyposaurus2=Rhabdognathus

}} }} }} }}


}}
title=Jouve et al. 2005[5]style=font-size:80%;line-height:80%label1=Dyrosauridae 1={{clade1=Chenanisuchus2={{clade1={{clade1=Sokotosuchus2=Phosphatosaurus}2={{clade1=Dyrosaurus2={{clade1=Arambourgisuchus2=Congosaurus3=Hyposaurus4=Rhabdognathus

}} }} }} }} }}


}}
Phosphatosaurus is considered to be a basal dyrosaurid, and is often positioned near the base of phylogenetic trees of dyrosaurids. An early phylogenetic analysis by Buffetaut (1978), not based on a cladistic data matrix, puts Phosphatosaurus at the base of the tree due to the presence of many primitive characters in the genus.[8] Later phylogenetic analyses, such as the one by Jouve (2005), have also shown Phosphatosaurus to be a basal member of the family.[9] In most analyses, Phosphatosaurus and Sokotosuchus form a clade. These two genera are more closely related to one another than to any other genus of dyrosaurid. More recent phylogenetic studies have considered Chenanisuchus, a short-snouted dyrosairid named in 2005, to be even more basal than the clade containing Phosphatosaurus and Sokotosuchus.[10]

References

1. ^1 2 {{cite journal |last=Hill |first=R. V. |author2=McCartney, J. A. |author3=Roberts, E. M. |author4=Bouaré, M. L. |author5=Sissoko, F. |author6= O'Leary, M. A. |year=2008 |title=Dyrosaurid (Crocodyliformes: Mesoeucrocodylia) fossils from the Upper Cretaceous and Paleogene of Mali: implications for phylogeny and survivorship across the K/T Boundary |journal=American Museum Novitates |volume=3631 |pages=15–17 |url=http://digitallibrary.amnh.org/dspace/bitstream/2246/5940/1/N3631.pdf |doi=10.1206/598.1}}
2. ^1 {{cite journal |last=Bergounioux |first=F. M. |year=1956 |title=Les reptiles fossiles des dépôts phosphatés sud tunisiens |journal=Annales des Mines et de la Géologie |volume=15 |pages=105}}
3. ^{{cite journal |last=Buffetaut |first=E. |year=1979 |title=Présence du Crocodilien Phosphatosaurus (Mesosuchia, Dyrosauridae) dans le Paléocène du Niger et du Mali |journal=Paläontologische Zeitschrift |volume=53 |pages=323–333 |doi=10.1007/bf02986594}}
4. ^{{cite journal |last=Hill |first=R. V. |author2=McCartney, J. A. |author3=Roberts, E. M. |author4=Bouaré, M. L. |author5=Sissoko, F. |author6= O'Leary, M. A. |year=2008 |title=Dyrosaurid (Crocodyliformes: Mesoeucrocodylia) fossils from the Upper Cretaceous and Paleogene of Mali: implications for phylogeny and survivorship across the K/T Boundary |journal=American Museum Novitates |volume=3631 |pages=15–17 |url=http://digitallibrary.amnh.org/dspace/bitstream/2246/5940/1/N3631.pdf |doi=10.1206/598.1}}
5. ^1 2 {{cite journal |last=Jouve |first=S. |author2=Iarochène, M. |author3=Bouya, B. |author4= Amaghzaz, M. |year=2005 |title=A new dyrosaurid crocodyliform from the Palaeocene of Morocco and a phylogenetic analysis of Dyrosauridae |journal=Acta Palaeontologica Polonica |volume=50 |issue=3 |pages=581–594 |url=http://app.pan.pl/archive/published/app50/app50-581.pdf}}
6. ^{{cite journal |last=Brochu |first=C. A. |year=2006 |title=Osteology and phylogenetic significance of Eosuchus minor (Marsh, 1870) new combination, a longirostrine crocodylian from the late Paleocene of North America |journal=Journal of Paleontology |volume=80 |pages=162–186 |doi=10.1666/0022-3360(2006)080[0162:oapsoe]2.0.co;2}}
7. ^{{cite journal |last=Buffetaut |first=E. |year=1979 |title=Sokotosuchus ianwilsoni and the evolution of the dyrosaurid crocodilians |journal=The Nigerian Field Monograph |volume=1 |pages=31–41}}
8. ^1 {{cite journal |last=Buffetaut |first=E. |year=1978 |title=Les Dyrosauridae (Crocodylia, Mesosuchia) des phosphates de l’Eocène inférieur de Tunisie: Dyrosaurus, Rhabdognathus, Phosphatosaurus |journal=Géologie Méditerranéenne |volume=5 |pages=237–256}}
9. ^1 {{cite journal |last=Jouve |first=S. |year=2005 |title=A new description of the skull of Dyrosaurus phosphaticus (Thomas, 1893) (Mesoeucrocodylia: Dyrosauridae) from the Lower Eocene of North Africa |journal=Canadian Journal of Earth Sciences |volume=42 |pages=323–337 |doi=10.1139/e05-008}}
10. ^{{cite journal |last=Jouve |first=S. |author2=Bouya, B |author3= Amaghzaz, M. |year=2005 |title=A short-snouted dyrosaurid (Crocodyliformes, Mesoeucrocodylia) from the Palaeocene of Marocco |journal=Palaeontology |volume=48 |issue=2 |pages=359–369 |doi=10.1111/j.1475-4983.2005.00442.x}}

External links

  • Phosphatosaurus in the Paleobiology Database
{{Portal|Paleontology}}{{Neosuchia|N.}}{{Taxonbar|from=Q2778681}}

5 : Eocene crocodylomorphs|Prehistoric reptile genera|Prehistoric marine crocodylomorphs|Paleogene reptiles of Africa|Dyrosaurids
随便看

　

开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。

　

Copyright © 2023 OENC.NET All Rights Reserved
京ICP备2021023879号 更新时间：2024/11/13 9:39:26