Kalpana Kalpana (Editor)

Merriamosauria

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Kingdom
  
Order
  
†Ichthyosauria

Higher classification
  
Ichthyosaur

Phylum
  
Chordata

Node
  
†Hueneosauria

Merriamosauria

Node
  
†MerriamosauriaMotani, 1999

Lower classifications
  

Merriamosauria is an extinct clade of ichthyosaurs. It was named by Ryosuke Motani in his 1999 analysis of the relationships of ichthyopterygian marine reptiles and was defined in phylogenetic terms as a stem-based taxon including "the last common ancestor of Shastasaurus pacificus and Ichthyosaurus communis, and all of its descendants." The name honours John Campbell Merriam. Based on this definition, Merriamosauria includes most ichthyosaurs except for several Triassic groups such as the clade Mixosauria, the family Cymbospondylidae, and perhaps the family Toretocnemidae. Merriamosaurs are characterized by features in their pectoral girdles and limb bones, including an extensive connection between the scapula and the coracoid bone, the absence of the first metacarpal and the absence of a pisiform bone.

References

Merriamosauria Wikipedia


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