Simplicidentata

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Simplicidentata
Temporal range:
Early Paleocene
to present
Marsh rice rat (Oryzomys palustris)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Grandorder: Glires
Mirorder: Simplicidentata
Weber, 1904
Orders

Simplicidentata is a group of

synapomorphic (shared derived) feature of Simplicidentata.[3] The loss of the second upper premolar (P2) has also been considered as synapomorphic for Simplicidentata, but the primitive simplicidentate Sinomylus does have a P2.[4]

This sense of Simplicidentata was introduced by Chuankui Li and colleagues in 1987, who ranked Simplicidentata as a

macroscelideans, and some additional extinct groups). Within Simplicidentata, they recognized the orders Mixodontia (including only the extinct family Eurymylidae from the Paleocene and Eocene of Asia) and Rodentia.[6] McKenna and Bell's decision to use Simplicidentata was criticized by reviewer Frederick S. Szalay, who preferred to simply place the Mixodontia within Rodentia, which would leave Simplicidentata unnecessary.[7] In The Beginning of the Age of Mammals (2006), Kenneth Rose recognized a mirorder Simplicidentata, including Mixodontia, Rodentia, and the genus Sinomylus (not placed in either order), within the superorder Anagalida.[8]

References

  1. ^ Landry, 1999, p. 286
  2. ^ Meng et al., 2009, p. 1
  3. ^ Meng and Wyss, 1994, p. 201
  4. ^ McKenna and Meng, 2001, p. 565
  5. ^ Meng and Wyss, 1994, p. 199
  6. ^ McKenna and Bell, 1997, p. 113
  7. ^ Szalay, 1999, p. 194
  8. ^ Rose, 2006, pp. 9, 315

Literature cited