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{{Automatic taxobox
{{Italic title}}
{{Taxobox
| name = ''Mariliasuchus''
| fossil_range = [[Late Cretaceous]]
| fossil_range = [[Late Cretaceous]]
| image = Mariliasuchus_BW.jpg
| image = Mariliasuchus_BW.jpg
| image_width = 250px
| image_width = 250px
| image_caption = ''Mariliasuchus amarali''
| image_caption = ''Mariliasuchus amarali''
| authority = Carvalho and Bertini, [[1999 in paleontology|1999]]
| regnum = [[Animal]]ia
⚫
| subdivision_ranks = Species
| phylum = [[Chordata]]
| classis = [[Reptile|Sauropsida]]
| infraclassis = [[Archosauromorpha]]
| superordo = [[Crocodylomorpha]]
| unranked_familia = [[Mesoeucrocodylia]]
| unranked_familia = [[Notosuchia]]
| familia = [[Notosuchidae]]
| genus = '''''Mariliasuchus'''''
| genus_authority = Carvalho & Bertini, 1999
⚫
| subdivision_ranks = [[Species]]
| subdivision =
| subdivision =
*''M. amarali'' <small>Carvalho & Bertini, 1999 ([[type species|type]])</small>
* {{extinct}}''M. amarali'' <small>Carvalho and Bertini, 1999 ([[type species|type]])</small>
* {{extinct}}''M. robustus'' <small>Nobre ''et al.'', 2007</small>
⚫
*''M. robustus'' <small>Nobre ''et al.'', 2007<ref name=Nobre2007>{{cite_journal |author=Pedro Henrique Nobre; Ismar de Souza Carvalho; Felipe Mesquita de Vasconcellos & Willian Roberto Nava |year=2007 |title=Mariliasuchus robustus, a new Crocodylomorpha (Mesoeucrocodylia) from the Bauru Basin, Brazil |journal=Anuário do Instituto de Geociências |volume=30 |issue=1 |pages=38–49 |issn=0101-9759}}[http://www.anuario.igeo.ufrj.br/anuario_2007_1/2007_1_38_49.pdf pdf]</ref></small>
}}
}}


'''''Mariliasuchus''''' ("Marilia crocodile") is an [[extinct]] [[genus]] of [[Late Cretaceous]] [[notosuchia]]n [[mesoeucrocodylia]]n found near [[Marilia]], [[Brazil]]. It was described in 1999 by Brazilian [[palaeontologists]] Ismar de Souza Carvalho and Reinaldo J. Bertini.
'''''Mariliasuchus''''' ("Marilia crocodile") is an [[extinct]] [[genus]] of [[Late Cretaceous]] [[notosuchia]]n [[mesoeucrocodylia]]n found near [[Marilia]], [[Brazil]]. It was described in 1999 by Brazilian [[palaeontologists]] Ismar de Souza Carvalho and Reinaldo J. Bertini.


⚫
Its type species is ''M. amarali'', in honour of Sérgio Estanislaw do Amaral, Brazilian [[naturalist]]. A second species, ''M. robustus'', was named in 2007.<ref name=Nobre2007>{{cite_journal |author=Pedro Henrique Nobre; Ismar de Souza Carvalho; Felipe Mesquita de Vasconcellos & Willian Roberto Nava |year=2007 |title=Mariliasuchus robustus, a new Crocodylomorpha (Mesoeucrocodylia) from the Bauru Basin, Brazil |journal=Anuário do Instituto de Geociências |volume=30 |issue=1 |pages=38–49 |issn=0101-9759}}[http://www.anuario.igeo.ufrj.br/anuario_2007_1/2007_1_38_49.pdf pdf]</ref>
Its type species is ''M. amarali'', in honour of Sérgio Estanislaw do Amaral, Brazilian [[naturalist]].


== Material ==
== Material ==

Revision as of 05:17, 30 August 2011

Mariliasuchus
Temporal range: Late Cretaceous
Mariliasuchus amarali
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Archosauria
Clade: Pseudosuchia
Clade: Crocodylomorpha
Clade: Crocodyliformes
Clade: †Notosuchia
Family: †Notosuchidae
Genus: †Mariliasuchus
Carvalho and Bertini, 1999
Species
  • †M. amarali Carvalho and Bertini, 1999 (type)
  • †M. robustus Nobre et al., 2007

Mariliasuchus ("Marilia crocodile") is an extinct genus of Late Cretaceous notosuchian mesoeucrocodylian found near Marilia, Brazil. It was described in 1999 by Brazilian palaeontologists Ismar de Souza Carvalho and Reinaldo J. Bertini.

Its type species is M. amarali, in honour of Sérgio Estanislaw do Amaral, Brazilian naturalist. A second species, M. robustus, was named in 2007.[1]

Material

Several specimens of M. amarali have been found to date:

  • UFRJ DG 50-R (holotype): a partially complete and articulated skeleton, including a nearly complete skull and partially preserved axial and appendicular skeletons. It belongs to a juvenile specimen.
  • UFRJ DG 105-R
  • UFRJ DG 106-R
  • MZSP-PV 50
  • MZSP-PV 51
  • MN 6298-V
  • MN 6756-V

All of these specimens have been recovered in a road cut near the town of Marilia. They come from the upper part of the Adamantina Formation, indicating a Late Cretaceous (possibly Campanian/Maastrichtian) age.

Systematics

A phylogenetic analysis done by Zaher et al. (2006) found Mariliasuchus amarali to share a close relationship with Comahuesuchus. Andrade et al. (2006), while studying the palate and choanae of some mesoeucrocodylians, reached this same conclusion. Though no name was given to this clade in either publication, it is referred in this article as Comahuesuchidae.

Palaeobiology

Mariliasuchus amarali head

Mariliasuchus, unlike modern crocodylians, was an animal of terrestrial habits. Its nostrils were located on the front of the skull, unlike modern crocodiles, in which the nostrils face upwards, to help the animal breathe while its almost completely submerged. Furthermore, the eyes in M. amarali are faced laterally (in modern crocodiles they face upwards). It had a very modified dentition, differentiated in incisiforms, caniforms and molariforms. Strangelly, in particular, were the anterior-most teeth, which were directed horizontally rather than vertically. The function of this strange arrangement is not yet clear, but Vasconcellos et al. (2002) made comparisons with the dentition of pigs, indicating that their dietary preferences may be convergent. It also had strong jaw muscles, indicating a good degree of mandibular activity.

There seems to be a significant degree of variation between specimens of M. amarali. Some of this is related to ontogenetic variation, but some may also suggest sexual dimorphism, or even that some of the specimens assigned to this species belong to a different animal.

Ontogenetic studies done by Vasconcellos and Carvalho (2005) concluded that during its growth, the skull of M. amarali individuals becomes shorter and the skull more resistant, while being laterally compressed. In adulthood, the orbit has a less circular arrangement than in younger individuals.

References

  1. ^ Pedro Henrique Nobre; Ismar de Souza Carvalho; Felipe Mesquita de Vasconcellos & Willian Roberto Nava (2007). "Mariliasuchus robustus, a new Crocodylomorpha (Mesoeucrocodylia) from the Bauru Basin, Brazil". Anuário do Instituto de Geociências. 30 (1): 38–49. ISSN 0101-9759.{{cite journal}}: CS1 maint: multiple names: authors list (link)pdf
  • Andrade, M.B.; Bertini, R. J.; Pinheiro, A. E. P. (2006). "Observations on the palate and choanae structures in Mesoeucrocodylia (Archosauria, Crocodylomorpha): phylogenetic implications". Revista Brasileira de Paleontologia, Sociedade Brasileira de Paleontologia. 9 (3): 323–332.
  • Vasconcellos, F.M. & Carvalho, I.S. (2006). Inferências morfofuncionais e ontogenéticas sobre o crânio de Mariliasuchus amarali Carvalho & Bertini 1999, Crocodylomorpha cretácico da Formação Araçatuba/Adamantina, Bacia Bauru, Brasil. Paleontologia de Vertebrados: Grandes Temas e Contribuições Científicas: 229-239.
  • Vasconcellos, F.M.; Carvalho, I.S.; Nobre, P.H. (2002). "Aspectos ecológicos de Mariliasuchus amarali (Crocodylomorpha) do". Cretáceo Superior da Bacia Bauru. Paleontologia em Destaque. 40: 43–44.
  • Zaher, H.; Pol, D.; Carvalho, A. B.; Riccomini, C.; Campos, D.; Navas, W. (2006). "Re-description of the cranial morphology of Mariliasuchus amarali, and its phylogenetic affinities (Crocodyliformes, Notosuchia)". American Museum Novitates. 3512: 1–40. doi:10.1206/0003-0082(2006)3512[1:ROTCMO]2.0.CO;2.
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