Dental occlusion in a 260-million-year-old therapsid with saber canines from the permian of Brazil

Science

Volumn 331, Issue 6024, 2011, Pages 1603-1605

  Cisneros, Juan Carlos ^a,b   Abdala, Fernando ^c   Rubidge, Bruce S ^c   Dentzien Dias, Paula Camboim ^a   De Oliveira Bueno, Ana ^b  

^a FEDERAL UNIVERSITY OF PIAUÍ   (Brazil)

^b FEDERAL UNIVERSITY OF RIO GRANDE DO SUL   (Brazil)

^c UNIVERSITY OF THE WITWATERSRAND   (South Africa)

Author keywords

[No Author keywords available]

Indexed keywords

ABUNDANCE; ANTIPREDATOR DEFENSE; DENTITION; DISPLAY BEHAVIOR; EVOLUTIONARY BIOLOGY; FOOD INTAKE; HERBIVORE; PALEOBIOLOGY; PERMIAN; PREDATOR; REPTILE;

ARTICLE; BRAZIL; DOG; ENAMEL; EVOLUTION; FOSSIL ANIMAL; NONHUMAN; PALEOZOIC; PREDATOR; PRIORITY JOURNAL; THERAPSID; TOOTH OCCLUSION;

ANIMALS; BIOLOGICAL EVOLUTION; BRAZIL; CUSPID; DENTAL OCCLUSION; DENTITION; FEEDING BEHAVIOR; FOSSILS; PALEODONTOLOGY; PHYLOGENY; SKULL; TOOTH; VERTEBRATES;

BRAZIL;

MAMMALIA; REPTILIA; TETRAPODA; THERAPSIDA;

EID: 79953154450     PISSN: 00368075     EISSN: 10959203     Source Type: Journal    
DOI: 10.1126/science.1200305     Document Type: Article

References (29)

1. H.-D. Sues, R. R. Reisz, in Evolution of Herbivory in Terrestrial Vertebrates, H.-D. Sues, Ed. (Cambridge Univ. Press, Cambridge, 2000), pp. 9-41.
2. B. S. Rubidge, C. A. Sidor, Annu. Rev. Ecol. Syst. 32, 449 (2001).
3. J. Liu, B. Rubidge, J. Li, Acta Palaeontol. Pol. 54, 393 (2009).
4. T. S. Kemp, J. Evol. Biol. 19, 1231 (2006).
5. J. Fröbisch, Earth Sci. Rev. 95, 119 (2009).
6. J. Liu, B. Rubidge, J. Li, Proc. Biol. Sci. 277, 285 (2010).
7. K. D. Angielczyk, Paleobiology 30, 268 (2004).
8. Therapsida Broom, 1905; Anomodontia Owen, 1859; Anomocephaloidea taxon nov. Etymology: From the basal anomodont genus name Anomocephalus. Definition: All taxa more related to Anomocephalus africanus Modesto, Rubidge & Welman 1999 than to Otsheria (Venyukovia) netzvetajevi Tchudinov 1960; Tiarajudens eccentricus gen. et sp. nov. Etymology: A combination of Tiarajú, the type locality, and dens (Latin) tooth; eccentricus (Latin), "out of the center," used here in its modern sense, meaning something that departs from a conventional or established norm or pattern. Holotype: UFRGS PV393P, reposited in the Universidade Federal do Rio Grande do Sul, Porto Alegre. Partial cranium (Fig. 1) and unprepared postcranium. Horizon and locality: Found in an exposure of the Rio do Rasto Formation at Tiarajú District, São Gabriel Municipality, Rio Grande do Sul State, Brazil, Middle Permian. This unit is considered to correlate with the Tapinocephalus Assemblage Zone of the South African Karoo because of the co-occurrence of dinocephalians and pareiasaurs (28). Diagnosis: Large basal anomodont distinguished by the presence of large canines, reniform in basal cross section, featuring enamel, comprising more than 120% of the maximum snout (antorbital) height and more than 60% of total skull length; a row of 13 transversally expanded palatal teeth (average ratio of labiolingualmesiodistal length = 3:1), located in the ectopterygoid and pterygoid, showing uneven wear facets and long roots.
9. S. Modesto, B. Rubidge, J. Welman, Proc. Biol. Sci. 266, 331 (1999).
10. D. F. G. Poole, Q. J. Microsc. Sci. 97, 303 (1956).
11. G. M. King, Philos. Trans. R. Soc. London Ser. B 291, 243 (1981).
12. C. Sullivan, R. R. Reisz, R. M. H. Smith, Proc. Biol. Sci. 270, 173 (2003).
13. N. Rybczynski, R. R. Reisz, Nature 411, 684 (2001).
14. M. F. Ivakhnenko, Paleontol. J. 42, 859 (2008).
15. S. P. Modesto, Palaeontology 38, 213 (1995).
16. R. R. Reisz, J. Exp. Zool. (Mol. Dev. Evol.) 306B, 261 (2006).
17. M. F. Ivakhnenko, Paleontol. J. 39, S393 (2005).
18. T. Caro, Antipredator Defenses in Birds and Mammals (Univ. of Chicago Press, Chicago, 2005).
19. C. Darwin, The Descent of Man and Selection in Relation to Sex (William Clowes, London, 1871).
20. V. Geist, Deer of the World: Their Evolution, Behaviour, and Ecology (Stackpole Books, Mechanicsburg, PA, 1998).
21. D. J. Emlen, Annu. Rev. Ecol. Evol. Syst. 39, 387 (2008).
22. H. R. Barghusen, Paleobiology 1, 295 (1975).
23. K. D. Rose, The Beginning of the Age of Mammals (Johns Hopkins Univ. Press, Baltimore, MD, 2006).
24. Materials and methods are available as supporting material on Science Online.
25. S. P. Modesto, N. Rybczynski, in The Age of Dinosaurs in Russia and Mongolia, M. J. Benton, M. A. Shishkin, D. M. Unwin, E. N. Kurochkin, Eds. (Cambridge Univ. Press, Cambridge, 2000), chap. 2.
26. J. Fröbisch, R. R. Reisz, Proc. Biol. Sci. 276, 3611 (2009).
27. G. J. Ogg, G. Ogg, F. M. Gradstein, The Concise Geologic Time Scale (Cambridge Univ. Press, Cambridge, 2008).
28. J. C. Cisneros, F. Abdala, M. C. Malabarba, Rev. Bras. Paleontol. 8, 13 (2005).
29. We thank A. E. Figueiredo, M. A. França, T. P. Melo, and W. Velasques-Alves for field support. V. Abdala, K. Angielczyk, L. Backwell, P. Backwell, M. Jennions, T. Kemp, and R. Reisz, are acknowledged for discussion and valuable comments. J.C.C., P.C.D.D., and A.O.B. were funded by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); F.A. and B.S.R. were funded by the Department of Science and Technology, National Research Foundation, and Palaeontological Scientific Trust. Fieldwork was funded by a CNPq grant (478914/2006-77) awarded to C. L. Schultz.