Lessemsauridae

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Lessemsauridae
Temporal range:
Late Triassic-Early Jurassic, 215–190 Ma
Lessemsaurus Senckenberg.jpg
Skeletal mount of Lessemsaurus
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Saurischia
Suborder: Sauropodomorpha
Clade: Sauropoda
Clade: Lessemsauridae
Apaldetti et al., 2018
Genera

Lessemsauridae is a clade of early sauropod dinosaurs that lived in the Triassic and Jurassic of Argentina and South Africa. A phylogenetic analysis performed by Apaldetti and colleagues in 2018 recovered a new clade of Sauropodiformes uniting Lessemsaurus, Antetonitrus, and the recently described Ingentia which they named Lessemsauridae. Lessemsaurids had highly pneumatic cervical and dorsal vertebrae, very antero-posteriorly short but tall cervical vertebrae, robust cervicals, a very expanded distal scapula blade, and upright arms. Depending on the definition of Sauropoda, the clade is either the oldest sauropod taxon, or the sister taxon of the clade. An additional member of the clade was named later in 2018, Ledumahadi. Lessemsaurids are recognised as very large quadrupeds that achieved giant sizes (up to 12 metric tons) independently of other giant sauropods.[1] The phylogenetic analysis performed by Apaldetti and colleagues is shown below:[2]

Sauropodiformes

Mussaurus

Aardonyx

Sefapanosaurus

Melanorosauridae

Camelotia

Melanorosaurus

Sauropoda
Lessemsauridae

Antetonitrus

Ingentia

Lessemsaurus

Blikanasaurus

Gongxianosaurus

Pulanesaura

Gravisauria

References

  1. ^ McPhee; et al. (2018). "A Giant Dinosaur from the Earliest Jurassic of South Africa and the Transition to Quadrupedality in Early Sauropodomorphs". Current Biology. doi:10.1016/j.cub.2018.07.063.CS1 maint: Explicit use of et al. (link)
  2. ^ Apaldetti, Cecilia; Martínez, Ricardo N.; Cerda, Ignatio A.; Pol, Diego; Alcober, Oscar (2018). "An early trend towards gigantism in Triassic sauropodomorph dinosaurs". Nature Ecology & Evolution. doi:10.1038/s41559-018-0599-y.
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