摘要:

The dissection of five hands from four specimens of Tarsius sp. revealed an elaborate contrahens muscle group that may facilitate the specialised grip pattern in this form. Long muscle slips arise from the palm and pass to the distal phalanges of the digits. In addition, short muscle slips pass from one digit to the proximal phalanx of an adjacent digit.

ISSN:0015-5713    

DOI:10.1159/000155695

出版商:S. Karger AG    

年代:1975

数据来源: Karger

摘要:

Multivariate morphometric analyses of the wrist morphology of monkeys, apes and humans indicate that there is a fundamental difference between cercopithecoids and hominoids which can be related to functional and behavioral differences. The wrists of the Miocene fossil hominoids (Dryopithecus africanus and Pliopithecus vindobonensis) are almost completely monkey-like in their structure.

ISSN:0015-5713    

DOI:10.1159/000155696

出版商:S. Karger AG    

年代:1975

数据来源: Karger

摘要:

Radiographic analysis of mandibular fragments of the Oligocene primates Apidium phiomense and Parapithecus grangeri provides sequences of postincisor development and eruption. Although retaining the premolar eruption sequence (P2→P4→P3), the parapithecids possessed the derived feature of delayed canine appearance which, with other characters of cranial and postcranial morphology, aligns them with Anthropoidea and not Prosimii or platyrrhi

ISSN:0015-5713    

DOI:10.1159/000155697

出版商:S. Karger AG    

年代:1975

数据来源: Karger

摘要:

Variant structural homozygosity, observed previously only in plants and insects, is reported herein for the first time in mammalian chromosomes. The addition of a heterochromatic chromosome segment to either one or both homologues is described in autosomes B5 and B12 of the squirrel monkey, Saimiri sciureus.

ISSN:0015-5713    

DOI:10.1159/000155698

出版商:S. Karger AG    

年代:1975

数据来源: Karger

摘要:

Recent theories of nonhuman primate social organization and behavior suggest the existence of two primary modes of attention. In centripetal social groups attention is directed inward toward the group, ultimately to the dominant male. In acentric social groups attention is directed outward toward the surrounding environment. Such fundamental differences in postulated attention structure promote extreme, but predictable, variability in spatial relationships and social organization between primates displaying opposing modes. This difference is tested in two species of Old World monkeys, Mandrillus sphinx and Theropithecus gelada (subfamily Cercopithecinae), and shown to be that individuals in strongly centripetal groups remain closer to their dominant males than individuals in weakly centripetal groups. Correlations with other socioecological factors, including visual attention and body orientation are also demonstrated.

ISSN:0015-5713    

DOI:10.1159/000155699

出版商:S. Karger AG    

年代:1975

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000155700

出版商:S. Karger AG    

年代:1975

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000155694

出版商:S. Karger AG    

年代:1975

数据来源: Karger