Exaeretodon

Taxobox
name = "Exaeretodon"

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image_width = 250px
fossil_range = Middle to Late Triassic
regnum = Animalia
phylum = Chordata
classis = Synapsida
ordo = Therapsida
subordo = Cynodontia
familia = Traversodontidae
genus = "Exaeretodon"
genus_authority = Cabrera, 1943
subdivision_ranks = Species
subdivision =
* "E. frenguelli" (type species)
* ?"E. argentinus" Bonaparte, 1962
* ?"E. major" (Huene, 1935-42 (originally "Traversodon"))
* "E. riograndensis" Abdala, Barbarena, and Dornelles, 2002
* ?"E. statisticae" Chatterjee, 1982
* ?"E. vincei" (Bonaparte, 1963 (originally "Proexaeretodon"))

"Exaeretodon" is a genus of traversodontid cynodont; several species are known, from various formations. "E. argentinus", "E. frenguelli", and "E. vincei" are from the Carnian-age (Upper Triassic) Ischigualasto Formation of Argentina. "E. major" and "E. riograndensis" are from the Ladinian-age (Middle Triassic) portion of the Santa Maria Formation of Brazil. "E. statisticae" is from the Carnian-age Maleri Formation of India. This genus was an herbivore up to 1.8 meters long (5.9 ft), with a specialized grinding action when feeding.cite web |url=http://home.arcor.de/ktdykes/travers.htm#Exaeretodon |title=TRIASSIC GOMPHODONTS; Traversodontidae, an internet directory |accessdate=2007-07-29 |last=Dykes |first=Trevor ]

An analysis of the size of the bones of calves collected in Paleorrota concluded that the mother "Exaeretodon" had one or two calves, for one pregnancy. Another point of interest is that these cynodonts had deciduous teeth, which is a characteristic of mammals and means that babies could not chew, and required specialized parental care. Only older juveniles had permanent teeth.

Gallery

ee also

*Paleorrota

References

External links

* [http://www.palaeos.com/Mesozoic/Triassic/Carnian.600.htm#Exaeretodon "Exaeretodon"] at Palaeos.com.
* [http://www.royalsul.com.br/paleo/galeria.asp Dinosaurs of Rio grande do Sul.]