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Eozostrodon

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Eozostrodon Temporal range: Rhaetian ~210–202 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Clade:	Therapsida
Clade:	Cynodontia
Clade:	Mammaliaformes
Order:	†Morganucodonta
Family:	†Morganucodontidae
Genus:	†Eozostrodon Parrington, 1941
Type species
Eozostrodon parvus Parrington, 1941

Eozostrodon is an extinct morganucodont mammaliaform. It lived during the Rhaetian stage of the Late Triassic.^[1] Eozostrodon is known from disarticulated teeth from South West England and estimated to have been less than 10 cm (3.9 in) in head-body length, slightly smaller than the similar-proportioned Megazostrodon.^[1]^[2]

Eozostrodon was described on the basis of two teeth discovered in a quarry near FromeinSomerset, England, each originally assigned to separate species E. parvus and E. problematicus.^[3] The latter was synonymized in 1971.^[4] The identity of and status of Eozostrodon is controversial. Kühne considered Eozostrodon to be "one and the same" with Morganucodon which he described from thousands of fossils he collected in Wales, albeit after the published description of Eozostrodon, claiming "...for a number of good reasons Morganucodon ought to be used, the name of Eozostrodon being used for sentimental reasons only or because of ignorance."^[5] Jenkins and Crompton in 1979 argued Morganucodon was a subjective synonym of Eozostrodon,^[6] yet Clemens (1979) argued for the distinction.^[4] A more recent publication again distinguished the two, noting that Eozostrodon differs from M. watsoni in relative size and shape of premolar structures.^[7]

Its teeth were typical for an early mammaliaform, being differentiated into premolars and molars with triangular cusps.^{[citation needed]}

References

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^ ^a ^b Jenkins, Jr., F. A.; Parrington, F. R. (1976). "The Postcranial Skeletons of The Triassic Mammals Eozostrodon, Megazostrodon and Erythrotherium". Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences. 273 (926): 387–431. doi:10.1098/rstb.1976.0022.

^ "Classification of the genus Eozostrodon". Paleobiology Database. Retrieved 17 December 2021.

^ Parrington, F. R. (1941). "On two mammalian teeth from the Lower Rhaetic of Somerset". Journal of Natural History. Series 11. 8 (44): 140–144. doi:10.1080/00222934108527197.

^ ^a ^b Clemens, William A. (1979). "A problem in morganucodontid taxonomy (Mammalia)". Zoological Journal of the Linnean Society. 66 (1): 1–14. doi:10.1111/j.1096-3642.1979.tb01898.x.

^ Kühne, W. G. (1973). "The systematic position of monotremes reconsidered (Mammalia)". Zeitschrift für Morphologie der Tiere. 75 (1): 59–64. doi:10.1007/bf00723669.

^ F. A. Jenkins and A. W. Crompton. 1979. "Triconodonta. In J. A. Lillegraven, Z. Kielan-Jaworowska, W. A. Clemens (eds.), Mesozoic Mammals: the First Two-Thirds of Mammalian History 74-90. Summary

^ Z. Kielan-Jaworowska, R. L. Cifelli, and Z.-X. Luo. 2004. Mammals from the age of dinosaurs: Origins, evolution, and structure. Columbia University Press, New York 1-630.