Oromycter

Oromycter is an extinct genus of caseid synapsids from the Early Permian of Oklahoma. The sole and type species, Oromycter dolesorum, was named in 2005 by Robert R. Reisz.[1][2]

Oromycter
Temporal range: Early Permian 290.1–268 Ma
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: †Caseasauria
Family: †Caseidae
Genus: †Oromycter
Reisz, 2005
Type species
Oromycter dolesorum
Reisz, 2005

Description

Oromycter was a small caseid characterized by its dentition, which lacked the distinct leaf-like serrations of other caseids and instead possessed broad, spatulate and roughened cutting edges. Its teeth were also more thoroughly attached to the bone of the skull and jaw than in other members of Caseidae. The first and second teeth of the premaxilla show distinct wear facets which suggest that they occluded with the first and second teeth of the dentary, possibly to facilitate the cropping of vegetation. Its lacrimal bone, while clearly caseid in form, appears more primitive than in any other known caseid.[1]

Classification

Oromycter is the oldest and most basal caseid known, and is the sister taxon of all other caseids.

Below is a cladogram based on the phylogenetic analysis of Maddin et al. in 2008.[3]

Caseidae
 

Oromycter dolesorum

 
 
 

Casea broilii

 
 
 

"Casea rutena"

 
 
 

Ennatosaurus tecton

 
 
 

Cotylorhynchus romeri

 
 

Angelosaurus dolani

 
 
 
 
 
 
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See also

References
  1. Reisz, R. R. 2005. Oromycter, a New Caseid from the Lower Permian of Oklahoma. Journal of Vertebrate Paleontology 25 (4): 905-910.
  2. "Oromycter". Fossilworks. Retrieved 20 June 2016.
  3. Maddin, Hillary C.; Sidor, Christian A.; Reisz, Robert R. (2008-03-12). "Cranial anatomy of Ennatosaurus tecton (Synapsida: Caseidae) from the Middle Permian of Russia and the evolutionary relationships of Caseidae". Journal of Vertebrate Paleontology. 28 (1): 160–180. doi:10.1671/0272-4634(2008)28[160:CAOETS]2.0.CO;2. ISSN 0272-4634.


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