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Draft:Aztecia



Aztecia
Temporal range: Givetian–Frasnian
Scientific classification Edit this classification
Missing taxonomy template (fix): Aztecia
Type species
†Aztecia mahalae
Johanson & Ahlberg, 2001

Aztecia is an extinct genus of basal tetrapodomorphs. It belonged to Rhizodontida, one of the earliest-diverging tetrapodomorph clades. A. mahalae comes from the Aztec Siltstone in Victoria Land, Antarctica, dating back to the Middle Devonian–Late Devonian. [1] Aztecia mahalae genus name refers to the Aztec Siltstone were the specimens were recovered, and the species name refers to the British palaeontologist Mahala Andrews who worked on rhizodontid fish.

History

In 1992, a mandible associated with pectoral girdle material was described as Notorhizodon. [2] It was identified as a rhizodontid on the basis of the pectoral girdle material. However, the morphology of the mandible is very different from other Rhizodontida. In 2001, the pectoral material was separated from the mandible material as a new rhizodontid species, Aztecia mahalae. [1]

Description

Aztecia was a small rhizodont. It is known from a humerus, a clavicle and a cleithrum. Aztecia differs from other rhizodontid by having a humerus with a wide preaxial flange and a cleithurm with a narrow, recessed flange along the posterior margin. [1]

Phylogeny

The cladogram presented below show a possible position of Aztecia among Rhizodontida. It is based on a 2012 study by Jeffery:[3]

Rhizodontida


References

  1. ^ a b c Johanson, Z.; Ahlberg, P. E. (2001). "Devonian rhizodontids and tristichopterids (Sarcopterygii; Tetrapodomorpha) from East Gondwana". Transactions of the Royal Society of Edinburgh: Earth Sciences. 92 (1): 43–74. doi:10.1017/S0263593300000043.
  2. ^ Young, G. C.; Long, J.; Ritchie, A. (1992). "Crossopterygian Fishes from the Devonian of Antarctica: Systematics, Relationships, and Biogeographic Significance". Records of the Australian Museum, Supplement. 14: 1–77. doi:10.3853/j.0812-7387.14.1992.90.
  3. ^ Jeffery, J. E. (2012). "Cranial morphology of the Carboniferous rhizodontid Screbinodus ornatus (Osteichthyes: Sarcopterygii)". Journal of Systematic Palaeontology. 10 (3): 475–519. Bibcode:2012JSPal..10..475J. doi:10.1080/14772019.2011.595961.


Category:Rhizodontida Category:Prehistoric lobe-finned fish genera Category:Fossils of Antartica

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