Navegando por Autor "Okumura, Mercedes"

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Artigo
Quaternary ungulates of the Abismo Ponta de Flecha Cave, Ribeira of Iguape Valley, Southeast Brazil: Zooarchaeological and Paleoenvironmental aspects
(2023-01) Chahud, Artur; Costa, Paulo Ricardo de Oliveira; Figueiredo, Gisele Ferreira; Okumura, Mercedes
The Ribeira de Iguape Valley, located in the south of the state of São Paulo, presents a complex system of caves developed from Precambrian carbonate rocks. The presence of such karstic system favored the preservation of numerous fossilized remains of Quaternary mammals. The Abismo Ponta de Flecha Cave, located in the municipality of Iporanga, is a vertical cave divided into several lateral galleries with abundant vertebrate specimens. Among the most common are the ungulates, a clade of mammals characterized mainly by the presence of hooves, represented by the Holoarctic ungulates families Cervidae, Tayassuidae, Tapiridae, and the South American native ungulate Toxodontidae. The most common family in the deposit is Tayassuidae, with several individuals assigned to the species Tayassu pecari, Dicotyles tajacu, as well as an indeterminate large Tayassuidae. The Cervidae remains found in the cave have two species assigned to the genus Mazama; M. americana and M. gouazoubira. A specimen of the Tapiridae family, Tapirus sp., was also found. Only one species attributed to the extinct family Toxodontidae, Toxodon platensis, was recorded. Many specimens of Tayassuidae and Cervidae were subadults, and one individual of Tayassu pecari was very young. The origin of the specimens might be the result of the transport of individual bone parts, the death of accidently trapped animals as well as the disposal of such remains by human groups that inhabited the region in the past.
Artigo
The presence of Panthera onca Linnaeus 1758 (Felidae) in the Pleistocene of the region of Lagoa Santa, State of Minas Gerais, Brazil
(2020-08-19) Chahud, Artur; Okumura, Mercedes
The region of Lagoa Santa, State of Minas Gerais (Brazil) presents an important karst complex that includes several caves with a large amount of osteological material. Among the places of great palaeontological importance is the Cuvieri Cave, known for the diversity of extinct and extant animal species, including large cats. The Felidae emerged in South America during the Great American Biotic Interchange, and in a short period, they became the main predators of the region, with considerable osteological record. Currently, Panthera onca is the main carnivore in Neotropical America, even so Pleistocene specimens are little known or studied. An adult specimen, represented by teeth, small appendicular bones (calcaneus, astragalus, phalanges, metacarpals and metatarsals) and fragmented larger bones (ulna, femur and tibia), of Pleistocene age found in the Cuvieri Cave is presented here, providing anatomical and preservation data, adding information about this species in the Brazilian Quaternary.