Massetognathinae

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Massetognathinae
Temporal range: Middle Triassic - Late Triassic
Dadadon isaloi.jpg
Skull of the massetognathine Dadadon isaloi
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Order: Therapsida
Suborder: Cynodontia
Family: Traversodontidae
Subfamily: Massetognathinae
Kammerer et al., 2012
Genera

See text

Massetognathinae is an extinct subfamily of cynodonts in the family Traversodontidae. It includes four species from the Middle and Late Triassic: Massetognathus pascuali from Argentina, Massetognathus ochagaviae and Santacruzodon hopsoni from southern Brazil, and Dadadon isaloi from Madagascar.[1] Massetognathines have several distinguishing characteristics, including flattened skulls, small canine teeth, and postcanine teeth with three cusps on their outer edges. Massetgognathinae was defined by Kammerer et al. (2012) as the clade containing all traversodontids more closely related to Massetognathus pascuali than to Gomphodontosuchus brasiliensis, and is the sister taxon of the traversodontid subfamily Gomphodontosuchinae, which was defined by Kammerer et al. (2008) as all traverodontids more closely related to G. brasiliensis than to M. pascuali.[2]

Life restoration of Massetognathus pascuali

Below is a cladogram from Kammerer et al. (2012) showing the phylogenetic position of Massetognathinae within Traversodontidae:[1]

Cynognathia 

Cynognathus


Gomphodontia

Diademodon



Trirachodontidae

Trirachodon




Cricodon



Langbergia




Traversodontidae


Andescynodon



Pascualgnathus






Arctotraversodon




Boreogomphodon



Nanogomphodon





Massetognathinae

Massetognathus




Dadadon



Santacruzodon




Gomphodontosuchinae

Gomphodontosuchus




Menadon




Protuberum




Exaeretodon



Scalenodontoides












References[edit]

  1. ^ a b Kammerer, C. F.; Flynn, J. J.; Ranivoharimanana, L.; Wyss, A. R. (2012). "Ontogeny in the Malagasy Traversodontid Dadadon isaloi and a Reconsideration of its Phylogenetic Relationships". Fieldiana Life and Earth Sciences. 5: 112. doi:10.3158/2158-5520-5.1.112. 
  2. ^ Kammerer, C. F.; Flynn, J. J.; Ranivoharimanana, L.; Wyss, A. R. (2008). "New material ofMenadon besairiei(Cynodontia: Traversodontidae) from the Triassic of Madagascar". Journal of Vertebrate Paleontology. 28 (2): 445. doi:10.1671/0272-4634(2008)28[445:NMOMBC]2.0.CO;2.