Results 41 to 50 of about 2,094 (177)

The mechanism of labor in nonhuman primates: A look inside

The Anatomical Record, EarlyView.
Abstract While in humans, the flexed position of the fetus and its rotating course down the birth canal are well documented, in other primates the mechanism of labor is unknown. Despite the lack of comparative data, it is commonly assumed that the human obstetric mechanism is unique, and anthropologists have disputed when and why the transition to the ...
Melissa K. Stoller
wiley   +1 more source

Humans and platyrrhines share a pattern of articular variance

The Anatomical Record, EarlyView.
Abstract Previous work has identified a pattern of articular shape variation in modern human limb joints, in which convex joint surfaces exhibit constrained variance relative to their more variable concave conarticulars. This pattern is notable given that joint morphogenesis is influenced by local biomechanical environments, which vary substantially ...
Haley Horbaly, Liam Zachary
wiley   +1 more source

Primatas do Parque Nacional do Viruá, Roraima, Brasil

Biodiversidade Brasileira, 2018
Este trabalho apresenta o inventário consolidado de primatas do Parque Nacional do Viruá, Roraima, feito a partir da revisão da literatura e consulta ao material tombado nas coleções do Instituto Nacional de Pesquisas da Amazônia e do Museu Paraense ...
Renata Bocorny de Azevedo, Marcos de Souza Fialho, Marcelo Derzi Vidal, Rafael Suertegaray Rossato, Ricardo Sampaio, Fábio Röhe   +5 more
doaj   +3 more sources

Humans are not unique: difficult birth is common in placental mammals

Biological Reviews, Volume 101, Issue 5, Page 2214-2239, October 2026.
ABSTRACT Human childbirth is widely presumed to be uniquely difficult and dangerous compared to birth in other mammals. Tight fetopelvic proportions can result in obstructed labour and contribute to high rates of maternal and neonatal mortality. Ideas summarised under the ‘obstetrical dilemma’ have contributed to this assumption by explaining difficult
Nicole D. S. Grunstra
wiley   +1 more source

Arboreal and Terrestrial Frugivore Vertebrate Assemblage Diversity and Composition Vary With Disturbance Histories in Guianan Forests

Ecology and Evolution, Volume 16, Issue 10, October 2026.
This study examined the impact of human disturbances on arboreal and terrestrial fruit‐consuming vertebrate assemblages across three tropical forest sites in French Guiana. While species richness remained consistent across sites, results revealed significant variations in visitation rates and a shift in dominant species.
Raphaëlle Abensur, Opale Coutant, Pierre Gloaguen, Malika Gottstein, Coraline Pelon, Eric Guilbert, Christophe Baltzinger, Pierre‐Michel Forget   +7 more
wiley   +1 more source

From armadillos to sloths: Patterns and variations in xenarthran coronary anatomy

The Anatomical Record, Volume 309, Issue 8, Page 2199-2220, August 2026.
Abstract Species of the superorder Xenarthra play a vital ecological role in the Neotropics. Despite their evolutionary significance, anatomical studies on their coronary circulation remain scarce. This study investigated the coronary anatomy of 82 hearts from nine Xenarthra species across the Dasypodidae, Myrmecophagidae, and Bradypodidae.
Wilson Viotto‐Souza, André Luiz Quagliatto Santos, Marcelo Abidu‐Figueiredo, Thaís Aparecida Silva, Rodrigo Ananias Barreiros Silva, Paulo de Souza‐Junior   +5 more
wiley   +1 more source

A comparison of personality in the common and Bolivian squirrel monkey (Saimiri sciureus and Saimiri boliviensis). [PDF]

Journal of Comparative Psychology, 2018
Personality has been studied in all of the great apes, many Old World monkey species, but only a handful of New World monkey species. Because understanding the personalities of New World monkeys is crucial to understanding personality evolution in primates, we used the Hominoid Personality Questionnaire to assess personality in 55 common squirrel ...
Wilson, Vanessa A.D., Inoue-Murayama, Miho, Weiss, Alexander   +2 more
openaire   +4 more sources

Outbreak of Toxoplasmosis Caused by the Brazilian Lineage Type BrII in Black Lion Tamarins (Leontopithecus chrysopygus) Co‐Infected With Leishmania sp.

Journal of Medical Primatology, Volume 55, Issue 3, June 2026.
ABSTRACT Background Toxoplasmosis and leishmaniosis are zoonotic diseases that affect several species of neotropical primates. Methods Three black lion tamarins (Leontopithecus chrysopygus) kept at a Brazilian zoo died due to a superacute disease.
Acauane Sehnem Lima, Daniel Oliveira dos Santos, Clarissa Helena Santana, Lucas dos Reis de Souza, Laice Alves da Silva, Nayara Ferreira de Paula, André Duarte Vieira, Herlandes Penha Tinoco, Carlyle Mendes Coelho, Ayisa Rodrigues de Oliveira, Hilda Fátima Jesus Pena, Renato Lima Santos   +11 more
wiley   +1 more source

Anotaciones sobre el patrón de replicación del cromosoma X en Saimiri sciureus linanaeus

Acta Biológica Colombiana, 2001
Dentro de los primates neotropicales el mono ardilla (Saimiri sciureus), debido a su distribución yabundancia, es, al parecer, el mas estable en vida libre por su gran capacidad de adaptación a há-bitats perturbados por el hombre.
OM. Torres, ML. Bueno, M. Leivovici, C. Ramírez   +3 more
doaj  

Presença do Plasmodium brasilianum em macacos capturados na área de enchimento do reservatório da usina hidrelétrica de Tucuruí, Pará Presence of Plasmodium brasilianum in monkeys captured in the area of the flood of the dam of Tucuruí power plant, Pará

Memorias do Instituto Oswaldo Cruz, 1985
Examinando-se o sangue de 2.046 primatas capturados durante a "Operação Curupira" encontraram-se plasmódios semelhantes ao Plasmodium brasilianum em sete espécies ou subespécies: Alouatta belzebul belzebul, Alouatta belzebul nigerrima, Alouatta seniculus,
Mércia Eliane de Arruda
doaj   +1 more source