Lamegoia

Lamegoia; Temporal range: Paleocene ; ~58–55 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Family:	†Didolodontidae
Genus:	†Lamegoia; Paula Couto 1952
Type species
	Lamegoia conodonta; Paula Couto, 1952
Species
	L. conodonta Paula Couto 1952;

Lamegoia is an extinct genus of mammals, belonging to the family Didolodontidae. It contains a single species, Lamegoia conodonta, which lived during the Late Paleocene in what is now South America.

Description

This animal is only known from a few fossil teeth, and reconstructing its appearance is therefore impossible. From comparison with some of his relatives, it is assumed it may have been 75 centimeters long. Lamegoia was characterized by bunodont teeth, quite similar to Didolodus but more archaic ; the lower molars possessed a complete trigonid.

Classification

Lamegoia is a member of the Didolodontidae, a badly known clade of south-american mammals from the early Cenozoic. Lamegoia conodonta was described in 1952 by Carlos de Paula Couto, over fossilized teeth found near São José de Itaborai in Brazil.

Paleobiology

Lamegoia possessed transversal and highly wavy Hunter-Schreger bands (structures present on the teeth, used for strengthening the enamel ; other mammals of similar size from the Itaboraí Formation possessed vertical bands. It is supposed that this characteristic was a functional adaptation to a certain type of vegetation, that the bunodont dentition of Lamegoia was able to process.^[1]

References

^ Line, Sérgio Roberto Peres; Bergqvist, Lílian Paglarelli (2005-12-30). "Enamel structure of paleocene mammals of the São José de Itaboraí basin, Brazil. 'Condylarthra', Litopterna, Notoungulata, Xenungulata, and Astrapotheria". Journal of Vertebrate Paleontology. 25 (4): 924–928. doi:10.1671/0272-4634(2005)025[0924:ESOPMO]2.0.CO;2. ISSN 0272-4634. S2CID 86265997.

C. d. Paula Couto. 1952. Fossil mammals from the beginning of the Cenozoic in Brazil. Condylarthra, Litopterna, Xenungulata, and Astrapotheria. Bulletin of the American Museum of Natural History 99(6):355-394
R. Cifelli. 1983. The origin and affinities of the South American Condylarthra and early Tertiary Litopterna (Mammalia). American Museum Novitates 2772:1-49
J. N. Gelfo. 2007. The ‘condylarth’ Raulvaccia peligrensis (Mammalia: Didolodontidae) from the Paleocene of Patagonia, Argentina. Journal of Vertebrate Paleontology 27(3):651-660

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[1] Line, Sérgio Roberto Peres; Bergqvist, Lílian Paglarelli (2005-12-30). "Enamel structure of paleocene mammals of the São José de Itaboraí basin, Brazil. 'Condylarthra', Litopterna, Notoungulata, Xenungulata, and Astrapotheria". Journal of Vertebrate Paleontology. 25 (4): 924–928. doi:10.1671/0272-4634(2005)025[0924:ESOPMO]2.0.CO;2. ISSN 0272-4634. S2CID 86265997.

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