| isolation and characterization of lymphocyte associated foamy virus from a red uakari monkey (cacajao rubicundus). | a syncytium-forming virus was isolated from the lymphocytes of a uakari monkey 70 days after establishing a lymphocyte/owl monkey kidney coculture in the wild. the morphology and morphogenesis of the virus, plus its physicochemical characteristics indicate that the agent is a foamy virus. an unusal cell alteration found in cultures infected with this foamy was the formation of eosinophilic intracytoplasmic inclusion in association with the syncytia. the agent was found to be antigenically distin ... | 1976 | 191616 |
| multiple canine teeth fistulae in a red uakari monkey. | | 1974 | 4494866 |
| play as physical flexibility training in five ceboid primates. | instantaneous focal animal sampling of positional behavior (posture and locomotion) during the play and nonplay of adults and juveniles of 5 ceboid monkeys (alouatta palliata, ateles geoffroyi, cacajao calvus, cebus capucinus, and saimiri boliviensis) in an optimal design field study of the function of play as physical flexibility training produced a sample of 98,261 observations. analyses of 67 distinct modes of positional behavior demonstrated that significantly enhanced rates of suspension an ... | 1994 | 7924251 |
| positional behavior of the white uakari (cacajao calvus calvus). | the positional behavior and habitat use of a group of white uakaries (cacajao calvus calvus) was observed for 6 weeks in the dry season at lake teiú, brazil. data are presented for feeding, traveling, and resting activities. the most common feeding posture is sit, followed by stand. cacajao frequently exhibits locomotor behaviors while in feeding trees, using pronograde clamber and quadrupedal walk. the most frequently used locomotor behaviors in travel are quadrupedal walk, leap, and pronograde ... | 1996 | 8893083 |
| the time of divergence between the two species of uacari monkeys: cacajao calvus and cacajao melanocephalus. | it has been suggested in the literature that primates of the genus cacajao have been restricted to flooded-forest habitats of western amazonia since their split from the chiropotes line in the tertiary. it has been proposed further that the differentiation of the two species of this genus, cacajao melanocephalus and cacajao calvus, occurred during the pleistocene period as a result of the fragmentation of the amazon forest and the isolation of populations in these forest fragments or refuges. ho ... | 2000 | 11155026 |
| abundance, diversity, and patterns of distribution of primates on the tapiche river in amazonian peru. | this work presents data on the relative diversity, abundance, and distribution patterns of primates in a 20 km2 area of the tapiche river in the peruvian amazon. population data were collected while the study area was both inundated and dry (march to september 1997) using conventional line-transect census techniques. survey results reflected the presence of 11 primate species, but population parameters on only eight of the species will be presented, including saddleback tamarins (saguinus fuscic ... | 2001 | 11376449 |
| morphologic, karyotypic, and molecular evidence of a new form of chiropotes (primates, pitheciinae). | morphologic, karyotypic, and molecular analyses were carried out in 25 specimens of a distinct morph of chiropotes (henceforth termed chiropotes sp.) obtained from a number of localities in the brazilian amazon. pelage coloration clearly distinguishes the collected specimens and all other known species of this genus. a distinct karyotype was described for chiropotes sp. it differs from c. satanas chiropotes by two pericentric inversions, and from c. satanas utahicki by three, which suggests that ... | 2003 | 14610730 |
| a survey for helminth parasites in feral new world non-human primate populations and its comparison with parasitological data from man in the region. | a survey for helminth parasites in feral new world non-human primates was conducted and compared with parasitological data from man in the region. a total of 835 fecal samples were collected from feral aotus nancymae, a. vociferans, saguinus labiatus, s. mystax, saimiri boliviensis peruviensis, s. sciureus macrodon, lagothrix lagotricha and cacajao calvus rubicundus. in addition, adult parasites were collected from necropsies performed on monkeys that died during quarantine and in captivity. hel ... | 2003 | 14641789 |
| social behavior in fission-fusion groups of red uakari monkeys (cacajao calvus ucayalii). | primates living in large groups that divide to forage must have social systems compatible with this mode of living. uakari monkeys (cacajao spp.) live in large groups and exhibit a form of fission-fusion grouping, but their social organization is poorly understood. we present some of the first data on social behavior for this genus based on a study on cacajao calvus ucayalii. they traveled in multimale multifemale groups of highly variable sizes, with bachelor units on the periphery. adult males ... | 2009 | 19722260 |
| chromosome phylogeny of the subfamily pitheciinae (platyrrhini, primates) by classic cytogenetics and chromosome painting. | the new world monkey (platyrrhini) subfamily pitheciinae is represented by the genera pithecia, chiropotes and cacajao. in this work we studied the karyotypes of pithecia irrorata (2n = 48) and cacajao calvus rubicundus (2n = 45 in males and 2n = 46 in females) by g- and c-banding, nor staining and chromosome painting using human and saguinus oedipus whole chromosome probes. the karyotypes of both species were compared with each other and with chiropotes utahicki (2n = 54) from the literature. | 2010 | 20565908 |
| development and annotation of shotgun sequence libraries from new world monkeys. | the draft genome sequences of several primates are available, providing insights into evolutionary and anthropological research. however, genomic resources from new world monkeys are conspicuously lacking. to date, the genomes of only two platyrrhine species, the common marmoset and the bolivian squirrel monkey, have been fully sequenced. this is especially limiting for comparative genomics research, considering that new world monkeys are the most speciose primate group, and platyrrhine genetic ... | 2012 | 22715851 |
| first report of filarial nematodes in free-living pitheciid primates. | although little studied, infections with nematodes of the onchocercidae leiper, 1911, predominated by the genera dipetalonema diesing, 1861 and mansonella faust, 1929, are frequent in wild primates and human populations in the neotropical forest areas. this study reports natural infections with dipetalonema freitasi bain, diagne & muller, 1987 and d. gracile (rudolphi, 1809) in two free-living species of pitheciid primates, extending the known geographical distribution of these species to the fo ... | 2019 | 30747402 |
| locomotor behavior and skeletal morphology of two sympatric pitheciine monkeys, pithecia pithecia and chiropotes satanas. | field observations of two sympatric pitheciine species reveal that the positional repertoire of the white-faced saki, pithecia pithecia, is dominated by leaping behaviors, whereas the bearded saki, chiropotes satanas, is predominantly quadrupedal. examination and comparison of the postcranial skeletal morphologies and limb proportions of these species display numerous features associated with their respective locomotor behaviors. these observations accord with associations found in other primate ... | 1988 | 31968859 |
| erratum. | mayor p, bowler m, lopez-plana c. 2013. functional morphology of the female genital organs in the peruvian red uakari monkey (cacajao calvus ucayalii). am j primatol 75: 545-554. in the article cited above, there was an error in calculating the ovarian volume. the corrected values are indicated in the revised table i below. | 2015 | 26486846 |
| proximate causes of the red face of the bald uakari monkey (cacajao calvus). | in social species, such as primates, facial appearances transmit a variety of social signals. although it is suggested that the intense red colour of the face of the bald uakari monkey might be an indicator of health, this hypothesis still has not been verified. this study describes the histological structure of the skin of the face in the bald uakari, compared with other non-red neotropical primates, to better understand the maintenance of its colour. the facial skin of the bald uakari monkey i ... | 2015 | 26587272 |
| highly polymorphic colour vision in a new world monkey with red facial skin, the bald uakari (cacajao calvus). | colour vision is highly variable in new world monkeys (nwms). evidence for the adaptive basis of colour vision in this group has largely centred on environmental features such as foraging benefits for differently coloured foods or predator detection, whereas selection on colour vision for sociosexual communication is an alternative hypothesis that has received little attention. the colour vision of uakaris (cacajao) is of particular interest because these monkeys have the most dramatic red facia ... | 2016 | 27053753 |
| enamel thickness and microstructure in pitheciin primates, with comments on dietary adaptations of the middle miocene hominoid kenyapithecus. | many living primates that feed on hard food have been observed to have thick-enameled molars. among platyrrhine primates, members of the tribe pitheciini (cacajao, chiropotes, and pithecia) are the most specialized seed and nut predators, and cebus apella also includes exceptionally hard foods in its diet. to examine the hypothesized relationship between thick enamel and hard-object feeding, we sectioned small samples of molars from the platyrrhine primates aotus trivergatus, ateles paniscus, ca ... | 2003 | 14624746 |
| menstrual cycle in four new world primates: poeppig's woolly monkey (lagothrix poeppigii), red uakari (cacajao calvus), large-headed capuchin (sapajus macrocephalus) and nocturnal monkey (aotus nancymaae). | genital organs from 33 nocturnal monkeys aotus namcymaae, 29 poeppig's woolly monkeys (lagothrix poeppigii), 21 red uakaris (cacajao calvus) and 11 large-headed capuchins (sapajus macrocephalus) were histologically analyzed in order to describe the endometrial changes related to the ovarian cycle. a. nancymaae and s. macrocephalus showed histological evidence of menstrual cycle with the detachment of the most superficial endometrium and the subepithelial reabsorption of the endometrial functiona ... | 2019 | 30269006 |
| y-autosome translocation in cacajao calvus rubicundus (platyrrhini). | | 1981 | 6977297 |
| the karyotype of cacajao melanocephalus (platyrrhini, primates). | chromosome studies were performed in a male representative of cacajao melanocephalus. the diploid number was 45: the chromosome complement consisting of 12 pairs of acrocentric autosomes, 9 pairs of biarmed autosomes and 1 heteromorphic pair composed of one subtelocentric and one acrocentric chromosome. the x chromosome was submetacentric and the y chromosome was apparently translocated to an acrocentric autosome. g-banding patterns were studied and the results compared to karyotypes previously ... | 1981 | 7200049 |
| peruvian red uakaris (cacajao calvus ucayalii) are not flooded-forest specialists. | in the literature, particularly in primatological books, the peruvian red uakari (cacajao calvus ucayalii) is generally considered as a species that is specialized on living in flooded forest, despite existing evidence to the contrary. here we review all available information on habitats where cacajao calvus ucayalii have been observed. most sightings are from terra firme, including palm swamps, or from mixed habitats, including terra firme and flooded forest. therefore, we conclude that the spe ... | 2010 | 20949117 |
| multilevel societies in new world primates? flexibility may characterize the organization of peruvian red uakaris (cacajao calvus ucayalii). | researchers have described multilevel societies with one-male, multifemale units (omus) forming within a larger group in several catarrhine species, but not in platyrhines. omus in multilevel societies are associated with extremely large group sizes, often with >100 individuals, and the only platyrhine genus that forms groups of this size is cacajao. we review available evidence for multilevel organization and the formation of omus in groups of cacajao, and test predictions for the frequency dis ... | 2012 | 23024445 |
| low birthrates and high levels of female reproductive inactivity may characterize the reproductive biology of wild peruvian red uakaris (cacajao calvus ucayalii). | birthrates are key parameters for population models and hunting sustainability analyses frequently used in conservation, but for many rare species, these data do not exist. we examine the reproductive organs of endangered red uakari monkeys to calculate birthrates in the wild. | 2015 | 25516270 |
| morphology of the oxyurid nematodes trypanoxyuris (t.) cacajao n. sp. and t. (t.) ucayalii n. sp. from the red uakari monkey cacajao calvus ucayalii in the peruvian amazon. | cacajao calvus ucayalii (thomas, 1928) (primates: pitheciidae), a subspecies endemic to the peruvian amazon, occurs in patchy and sometimes isolated populations in north-eastern peru and is in a vulnerable situation, mainly due to habitat loss and hunting. this rareness and remote distribution means that, until now, parasitical studies have been limited. based on optical and scanning electron microscopy of specimens of both sexes, we report two new species of trypanoxyuris pinworms occurring in ... | 2016 | 26282270 |
| an improved technique using dental prostheses for field quantification of the force required by primates for the dental penetration of fruit. | tooth morphology is an important determinant of primate diet, setting potential limits on processable item size and material properties. plunger-based commercial fruit firmness testers (penetrometers) have been used to estimate primate diet item hardness and, by proxy, bite force required for penetration. however, geometric forms and surface areas of penetrometer plungers and primate teeth differ considerably. accurate bite force estimation is especially important with pitheciine primates as the ... | 2015 | 26338228 |
| new records and range expansion of the white bald uakari (cacajao calvus calvus, i. geoffroy, 1847) in central brazilian amazonia. | the white bald uakari (cacajao calvus calvus) is among the least studied of the amazonian primates and is found exclusively in remote areas of the central amazon. the geographic distribution of this subspecies is still uncertain, and information on current threats and its conservation status is sparse. in this paper, we identify new locations of occurrence and propose range expansion of the cacajao calvus calvus. between 2008 and 2010, six field expeditions were undertaken in the middle solimões ... | 2014 | 24193509 |
| intestinal helminths in wild peruvian red uakari monkeys (cacajao calvus ucayalii) in the northeastern peruvian amazon. | parasites are important in the management of the health of primate populations. we examined 36 fecal samples from peruvian red uakari monkeys (cacajao calvus ucayalii) collected from wild animals in the northeastern peruvian amazon. samples were positive for helminth infection. nematodes egg: strongyloididae, trypanoxyuris sp., spirurid, and a cestode egg were identified. | 2014 | 24359637 |
| dose titration of deferasirox iron chelation therapy by magnetic resonance imaging for chronic iron storage disease in three adult red bald-headed uakari (cacajao calvus rubicundus). | iron overload is common in lemurs and some new world nonhuman primates raised in captivity, but there is no such documentation in the red bald-headed uakari (cacajao calvus rubicundus). this study describes postmortem documentation of severe iron storage disease in one red bald-headed uakari and the use of iron chelation with oral deferasirox in the three surviving members of the colony. magnetic resonance imaging was used to quantify pretreatment iron burden and to follow the response to therap ... | 2014 | 25000696 |
| functional morphology of the female genital organs in the peruvian red uakari monkey (cacajao calvus ucayalii). | functional morphology may provide important information that could improve methodologies for the diagnosis of the reproductive phase of females, and develop assisted breeding techniques for wildlife. this study examined features of genital organs in 19 peruvian red uakari monkey (cacajao calvus ucayalii) females in different reproductive stages, collected from wild animals hunted for food by rural communities in the north-eastern peruvian amazon, in order to provide knowledge on the reproductive ... | 2013 | 23440898 |