Yacarerani

Yacarerani; Temporal range: Turonian-Santonian; ~94.3–84.9 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Skull restoration by Jaime Headden
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	†Ziphosuchia
Genus:	†Yacarerani; Novas et al., 2009
Species
	†Y. boliviensis Novas et al., 2009;

Yacarerani (meaning "first Yacare" in Guaraní) is an extinct genus of Late Cretaceous notosuchian crocodylomorph. Fossils have been found in 2002 in the Cajones Formation in Amboró National Park of central Bolivia and are Turonian-Santonian in age.[1] The genus was recently described in 2009 in the Journal of Vertebrate Paleontology.[2] The material represents two individuals and was found in association with eggs that are thought to have been part of a nest. Yacarerani was a small crocodylomorph at around 80 centimetres (31 in) in length. It may have lived in small groups, creating burrows to lay eggs in.[3]

Restoration

Description and taxonomy

The dentition of Yacarerani, like many other notosuchians, is heterodont, with different tooth morphologies in different parts of the jaws. Two teeth in the lower jaw project forward from the tip, resembling the incisors of a rabbit. Other teeth, situated posteriorly, are cusped and adapted for grinding or chopping food such as tubers or small arthropods.[3] In the lower jaw, the dentary tooth rows merge posterior to the anterior dentary teeth. The same is true for the upper tooth rows, which merge on the palate.

Yacarerani presents similar teeth morphology to Adamantinasuchus navae, a crocodylomorph from Adamantina Formation, Bauru Group, Brazil.

Below is a cladogram from Novas et al. (2009) showing the phylogenetic position of Yacarerani:[2]

	Malawisuchus

	Candidodon

Notosuchus

Comahuesuchus

Mariliasuchus

	Yacarerani

	Adamantinasuchus

	Chimaerasuchus

	Sphagesaurus

	Baurusuchus

	Sebecidae

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References

Yacarerani at Fossilworks.org
Novas, F. E.; Pais, D. F.; Pol, D.; Carvalho, I. D. S.; Mones, A.; Scanferla, A.; Riglos, M. S. (2009). "Bizarre notosuchian crocodyliform with associated eggs from the Upper Cretaceous of Bolivia" (PDF). Journal of Vertebrate Paleontology. 29 (4): 1316–1320. doi:10.1671/039.029.0409.
Telam (December 21, 2009). Un paleontólogo argentino halló en Bolivia un cocodrilo de la era de los dinosaurios. Telam.

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[FWYacarerani-1] Yacarerani at Fossilworks.org

[Nea09-2] Novas, F. E.; Pais, D. F.; Pol, D.; Carvalho, I. D. S.; Mones, A.; Scanferla, A.; Riglos, M. S. (2009). "Bizarre notosuchian crocodyliform with associated eggs from the Upper Cretaceous of Bolivia" (PDF). Journal of Vertebrate Paleontology. 29 (4): 1316–1320. doi:10.1671/039.029.0409.

[Telam-3] Telam (December 21, 2009). Un paleontólogo argentino halló en Bolivia un cocodrilo de la era de los dinosaurios. Telam.