taxonID	type	description	language	source
03862568B537FF8EE4A6FAFFFE489286.taxon	description	DESCRIPTION UFRGS-PV- 1121 T is represented by a fragment of the right mandibular ramus of approximately 7 mm in length (Fig. 2). The horizontal portion is remarkably low and presents one ellipsoid empty alveolus, two alveoli preserving the base of the crowns and the fourth alveolus with a partial postcanine. The coronoid process is rising immediately behind the last postcanine, whereas the ventral margin of the horizontal ramus is straight (Fig. 5 A). In medial view the meckelian canal is placed near the ventral margin of the dentary, at approximately one quarter of the height of the bone (Fig. 2 B). Most of the meckelian canal is horizontal, except for the posterior portion, at the level of the preserved postcanine, which is directed postero-dorsally (Fig. 2 B). The preserved postcanine is 1.8 mm in anteroposterior length (Table 2) and shows a large main cusp, which is aligned with the anterior and posterior accessory cusps (Fig. 3). The top of the anterior accessory cusp is broken, yet, this cusp seems to be smaller than the posterior accessory one. An additional posterior accessory cusp is somewhat displaced towards the lingual side of the postcanine, but clearly visible in the labial margin (Fig. 3 A). An also broken anterior lingual cusp is positioned at the base of the anterior accessory cusp, and probably is totally hidden from the labial view of the sectorial margin. There are two bulbous cingular cusps ventrally to the second posterior accessory cusp and the anterior lingual cusp respectively, and a posterior cingular crest (Fig. 3 B). The root of the penultimate postcanine is single, as evidenced by the removal of bone in the lingual side of the mandibular ramus, with no evidence of a central furrow (Fig. 2).	en	Bento Soares, Marina, Abdala, Fernando, Bertoni-Machado, Cristina (2011): A sectorial toothed cynodont (Therapsida) from the Triassic Santa Cruz do Sul fauna, Santa Maria Formation, Southern Brazil. Geodiversitas 33 (2): 265-278, DOI: 10.5252/g2011n2a4, URL: http://dx.doi.org/10.5252/g2011n2a4
03862568B537FF8EE4A6FAFFFE489286.taxon	discussion	DISCUSSION The tiny fragment of lower jaw with tooth described is more likely that of a juvenile individual. The tooth is composed of an aligned series of cusps oriented dorsally, with the most anterior and posterior cusps displaced lingually and with a lingual cingulum formed by bulbous cusps and a posterior crest. A comparison between the crown of UFRGS-PV 1121 T and those of other South American sectorial toothed cynodonts follows. We restrict this comparison to the posterior lower postcanines, wherever possible (Fig. 4).	en	Bento Soares, Marina, Abdala, Fernando, Bertoni-Machado, Cristina (2011): A sectorial toothed cynodont (Therapsida) from the Triassic Santa Cruz do Sul fauna, Santa Maria Formation, Southern Brazil. Geodiversitas 33 (2): 265-278, DOI: 10.5252/g2011n2a4, URL: http://dx.doi.org/10.5252/g2011n2a4
03862568B537FF8EE4A6FAFFFE489286.taxon	description	Therapsida	en	Bento Soares, Marina, Abdala, Fernando, Bertoni-Machado, Cristina (2011): A sectorial toothed cynodont (Therapsida) from the Triassic Santa Cruz do Sul fauna, Santa Maria Formation, Southern Brazil. Geodiversitas 33 (2): 265-278, DOI: 10.5252/g2011n2a4, URL: http://dx.doi.org/10.5252/g2011n2a4
03862568B537FF8EE4A6FAFFFE489286.taxon	description	cf. Probainognathus sp. Chiniquodon sp. Archosaurifomes Gauthier, 1986	en	Bento Soares, Marina, Abdala, Fernando, Bertoni-Machado, Cristina (2011): A sectorial toothed cynodont (Therapsida) from the Triassic Santa Cruz do Sul fauna, Santa Maria Formation, Southern Brazil. Geodiversitas 33 (2): 265-278, DOI: 10.5252/g2011n2a4, URL: http://dx.doi.org/10.5252/g2011n2a4
03862568B537FF8EE4A6FAFFFE489286.taxon	synonymic_list	Proterochampsidae Romer, 1966	en	Bento Soares, Marina, Abdala, Fernando, Bertoni-Machado, Cristina (2011): A sectorial toothed cynodont (Therapsida) from the Triassic Santa Cruz do Sul fauna, Santa Maria Formation, Southern Brazil. Geodiversitas 33 (2): 265-278, DOI: 10.5252/g2011n2a4, URL: http://dx.doi.org/10.5252/g2011n2a4
03862568B537FF8EE4A6FAFFFE489286.taxon	description	2005; Martinelli & Rougier 2007) besides the lack of cingular cusps, being therefore different from the Santa Cruz do Sul specimen. Differences between UFRGS-PV 1121 T and the Late Triassic brasilodontids (Fig. 4 H) are also clear because the lower postcanines in this group present a tiny anterior accessory cusp very low in the crown in relation to the main cusp (Bonaparte et al. 2003, 2005). The posterior accessory cusp is also more developed and high in the specimen from Santa Cruz do Sul.	en	Bento Soares, Marina, Abdala, Fernando, Bertoni-Machado, Cristina (2011): A sectorial toothed cynodont (Therapsida) from the Triassic Santa Cruz do Sul fauna, Santa Maria Formation, Southern Brazil. Geodiversitas 33 (2): 265-278, DOI: 10.5252/g2011n2a4, URL: http://dx.doi.org/10.5252/g2011n2a4
03862568B537FF8EE4A6FAFFFE489286.taxon	discussion	Sectorial toothed cynodonts more similar to the new record of Santa Cruz do Sul are Prozostrodon brasiliensis from the Santa Maria Formation, Brazil, Probainognathus jenseni from the Middle Triassic Chañares Formation in Argentina and cf. Probainognathus sp. from the Carnian Ischigualasto Formation also in Argentina.	en	Bento Soares, Marina, Abdala, Fernando, Bertoni-Machado, Cristina (2011): A sectorial toothed cynodont (Therapsida) from the Triassic Santa Cruz do Sul fauna, Santa Maria Formation, Southern Brazil. Geodiversitas 33 (2): 265-278, DOI: 10.5252/g2011n2a4, URL: http://dx.doi.org/10.5252/g2011n2a4
03862568B537FF8EE4A6FAFFFE489286.taxon	description	A tiny (approximately 40 mm of skull length) juvenile specimen from the Ischigualasto Formation was also described as cf. Probainognathus sp. (Bonaparte & Crompton 1994). The lower postcanines are not visible due to jaw occlusion, whereas the posterior uppers show four aligned cusps in labial view, the second being the largest. The morphology of these upper postcanines is similar to the labial morphology of the lower postcanine of UFRGS-PV 1121 T, both in the number and degree of development of the marginal cusps as well as in the general proportion between the height and anteroposterior length of the crown. Unfortunately it is not possible to observe the lingual side of the postcanines from the Ischigualasto Formation specimen, hampering a complete knowledge of its tooth morphology. The postcanine preserved in the new specimen from Santa Cruz do Sul is therefore very similar, in labial view, to the posterior upper postcanines of cf. Probainognathus sp. from the Ischigualasto Formation. There is also a general similarity between the lower postcanine of UFRGS- A	en	Bento Soares, Marina, Abdala, Fernando, Bertoni-Machado, Cristina (2011): A sectorial toothed cynodont (Therapsida) from the Triassic Santa Cruz do Sul fauna, Santa Maria Formation, Southern Brazil. Geodiversitas 33 (2): 265-278, DOI: 10.5252/g2011n2a4, URL: http://dx.doi.org/10.5252/g2011n2a4
03862568B537FF8EE4A6FAFFFE489286.taxon	discussion	PV 1121 T with those of juvenile P. jenseni from the Chañares Formation. Taking into account the fragmentary nature of UFRGS-PV 1121 T, the differences mentioned above to juveniles of P. jenseni and the overall similarity to the specimen from the Ischigualasto Formation, we provisionally identify this specimen from Santa Cruz do Sul as cf. Probainognathus. Additional material is necessary to provide a more precise taxonomic identification of this taxon in Santa Cruz do Sul as well as in Ischigualasto.	en	Bento Soares, Marina, Abdala, Fernando, Bertoni-Machado, Cristina (2011): A sectorial toothed cynodont (Therapsida) from the Triassic Santa Cruz do Sul fauna, Santa Maria Formation, Southern Brazil. Geodiversitas 33 (2): 265-278, DOI: 10.5252/g2011n2a4, URL: http://dx.doi.org/10.5252/g2011n2a4
