摘要:

Q- and G-banding studies of Aotus trivirgatus trivirgatus and Aotus trivirgatus griseimembra are presented. After the analysis of 8 specimens, 2 A. t. trivirgatus and 6 A. t. griseimembra and the review of the literature on the field we state the existence of two different karyotypes, 2n = 54 and 2n = 50, for A.t.trivirgatus and three different karyotypes, 2n = 54, 2n = 52 and 2n = 50, for A. t. griseimembra. It was found that Robertsonian translocations were the mechanism involved in the numerical reduction of the chromosomes. The data presented include the statement of two natural hybrids and the cross-breedings which originated them.

ISSN:0015-5713    

DOI:10.1159/000155785

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

Sequences of eruption of teeth and union of epiphyses are determined for three species of African Cercopithecinae. These sequences are highly scalable and are highly comparable between and among the species. Some sex differences in sequence were found within each species. The sequences of epiphyseal union in these species of Old World monkeys are very similar to published sequences in New World monkeys and other groups of higher primates. It appears that there is a single pattern common to the Anthropoidea as a whole.

ISSN:0015-5713    

DOI:10.1159/000155786

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

Information on infant killing by males is reviewed and extended by personal communications and observations. Most cases of infant killing reported occurred during periods when a new alpha male was establishing himself and during arranged encounters of strangers or unfamiliar individuals in captivity. There seem to be no specific releasing stimuli for infant killing, but rather the lack of familiarity between male and females, their nonacceptance of him in the whole set of roles tied to the alpha status, and his special motivational condition as new alpha lead him to a state, in which attacks on infants may result. Infant killing is considered to have a selection advantage by increasing one’s own reproduction success while reducing the one of other male

ISSN:0015-5713    

DOI:10.1159/000155787

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

The number of vessels present in the umbilical cords of 40 nonsurviving squirrel monkey fetuses and neonates has been determined by gross and histologic examination. Four umbilical vessels were present in 72.5% of the cords and 27.5% contained three vessels. Coincident fetal malformations are noted.

ISSN:0015-5713    

DOI:10.1159/000155788

出版商:S. Karger AG    

年代:1977

数据来源: Karger

ISSN:0015-5713    

DOI:10.1159/000155789

出版商:S. Karger AG    

年代:1977

数据来源: Karger