Anomodont

Anomodonts Temporal range: Middle Permian-Late Triassic, 270–201Ma (Possible Early Cretaceous record.)[1] PreꞒ Ꞓ O S D C P T J K Pg N
Mounted skeleton of Lystrosaurus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Order:	Therapsida
Clade:	Neotherapsida
Suborder:	†Anomodontia Owen, 1859
Subgroups
See text

Anomocephalus

Otsheria

Aulacocephalodon

Kannemeyeria

Anomodontia is an extinct group of non-mammalian therapsids containing many species from the Permian and Triassic periods (possibly continuing into the Early Cretaceous),^[2] most of which were toothless herbivores.^[3] Anomodonts were very diverse during the Middle Permian, including primitive forms like Anomocephalus and Patranomodon and groups like the Venyukovioidea, the Dromasauria, and the Dicynodontia. Of these only the dicynodonts survived beyond the Middle Permian. Dicynodonts became the most successful and abundant of all herbivores in the Late Permian and Triassic, filling ecological niches ranging from large browsers down to small burrowers. Few dicynodont families survived the Permian–Triassic extinction event, but one lineage evolved into large, stocky forms that remained the dominant terrestrial herbivores right up until the Late Triassic, when changing conditions caused them to decline.

Classification

Taxonomy

• Order Therapsida
• SUBORDER ANOMODONTIA
  • Biseridens
  • Patranomodon
  • Superfamily Anomocephaloidea
    • Anomocephalus
    • Tiarajudens
  • Superfamily Venyukovioidea
    • Family Otsheridae
      • Otsheria
      • Suminia
    • Family Venyukoviidae
      • Ulemica
      • Venjukovia
  • Clade Chainosauria
    • Galechirus
    • Galeops
    • Galepus
    • Infraorder Dicynodontia

Phylogeny

Cladogram modified from Liu et al. (2009):^[2]

Below is a cladogram from Kammerer et al. (2013).^[4] The data matrix of Kammerer et al. (2013), a list of characteristics that was used in the analysis, was based on that of Kammerer et al. (2011), which followed a comprehensive taxonomic revision of Dicynodon.^[5] Because of this, many of the relationships found by Kammerer et al. (2013) are the same as those found by Kammerer et al. (2011). However, several taxa were added to the analysis including Tiarajudens Eubrachiosaurus, Shaanbeikannemeyeria, Zambiasaurus and many "outgroup" taxa (positioned outside Anomodontia), while other taxa were re-coded. As in Kammerer et al. (2011), the interrelationships of non-kannemeyeriiform dicynodontoids are weakly supported and thus vary between the analyses.^[4]

See also

• Theriodont
• Dinocephalia
• Biarmosuchians
• Evolution of mammals

References