Contribution to the knowledge of Hemiauchenia paradoxa (Artiodactyla, Camelidae) from the Pleistocene of southern Brazil

Abstract

-A description of the dentition and anterior and posterior limbs of new specimens of Hemiauchenia paradoxa Gervais & Ameghino is presented. The materials come from Santa Vitória do Palmar, Uruguaiana, Alegrete, Itaqui and Dom Pedrito municipalities in the Rio Grande do Sul State, southern Brazil. New characters supporting distinction between Hemiauchenia paradoxa and Palaeolama major Liais in the dental morphology and limb dimensions, are here presented: proportions of the mandible, morphology of the lingual lophs and labial lophids of molar teeth, size of protostylid and parastylid of the molars and the proportions of distal segments of limbs. Studies with material of other South American regions could contribute for the distinction between these taxa, and between the others camels of South American Pleistocene.Key words: Hemiauchenia paradoxa, Camelidae, Artiodactyla, Pleistocene, Rio Grande do Sul State, Brazil. RESUMO -É aqui apresentado a descrição da dentição e de membros anteriores e posteriores de novos espécimes deHemiauchenia paradoxa Gervais & Ameghino. Os materiais são provenientes dos municípios de Santa Vitória do Palmar, Uruguaiana, Alegrete, Itaqui e Dom Pedrito no Rio Grande do Sul, sul do Brasil. Novos caracteres que suportam a distinção entre Hemiauchenia paradoxa e Palaeolama major Liais na morfologia dentária e dimensões pós-cranianas são aqui apresentados: proporções da mandíbula, morfologia dos lofos linguais e lófidos labiais nos dentes molares, tamanho do protostilido e parastilido nos molares e proporções dos segmentos distais dos membros. Estudos com material de outras regiões da América do Sul poderão melhor contribuir para a distinção entre estes táxons, bem como entre os demais camelídeos do Pleistoceno sul-americano. Palavras-chave: Hemiauchenia paradoxa,

Chinchillidae and Dolichotinae rodents (Rodentia: Hystricognathi: Caviomorpha) from the late Pleistocene of Southern Brazil

“…Diverse taxa indicative of open areas and environments drier than today's have been reported for the late Pleistocene of southern Brazil, such as camelids, the tayassuid Catagonus and the rodent Microcavia (Scherer et al, 2007;Ubilla et al, 2008;Gasparini et al, 2009). However, the presence of Myocastor in Chuí Creek suggests the presence of permanent water bodies.…”

Pehuen Co: Updated taxonomic review of a late Pleistocene ichnological site in Argentina

“…The likely trackmaker is Hemiauchenia Gervais and Ameghino, 1880 (Artiodactyla, Tylopoda, Camelidae), a camelid of large size that lived in the Buenos Aires province during the late Pleistocene (Scherer et al, 2007). Vyalov, 1965 Type ichnospecies: Pecoripeda gazella Vyalov, 1965 4.11.1 Pecoripeda commune nov. comb.…”

Quaternary mammals from central Brazil (Serra da Bodoquena, Mato Grosso do Sul) and comments on paleobiogeography and paleoenvironments

“…Such procedure took into account the occurrence of extinct Quaternary mammals above 50 kg in the Mato Grosso do Sul, Brazilian Intertropical region, São Paulo, Rio Grande do Sul, Uruguay, Mesopotamian region, North central Argentina, South of Bolivia, Paraguay and Pampean region. In Table 1, we present a matrix of presence (1) and absence (0) of taxa in South American paleozoogeographical zones, identified to species level, based on Prado & Alberdi (1999), Bond et al (2001), Alberdi & Prado (2004), Carlini et al (2004), Noriega et al (2004), Zurita et al (2004Zurita et al ( , 2007Zurita et al ( , 2011, Soibelzon et al (2005Soibelzon et al ( , 2012, Salles et al (2006), Pitana & Ribeiro (2007), Scherer et al (2007), Scheffler et al (2010), Pitana (2011), Miño-Boilini (2012, Silva et al (2012), Zurita et al (2012) including the specimens herein identified. The cluster analysis was performed on binary matrix employing the clustering algorithm UPGMA (Average Linkage Clustering; Sokal & Michener, 1958) and the Euclidean similarity index using the software Past 3.14.…”