摘要:

This paper presents information on the cranial and dental anomalies observed in the crania of three species of platyrrhine monkeys collected in Nicaragua. Cranial anomalies that are discussed include plagiocephaly, bregmatic fontanelle bones, Wormian bones, cranial trauma, and heterotopic bones. Among the dental anomalies that were studied were the following: crazing, caries, periodontal and pulpal disorders, alveolar thinning, mechanical loss, excessive attrition, shear bite, impacted molars, supernumerary teeth, congenital agenesis, congenital crown aberration, and irregular placement.

ISSN:0015-5713    

DOI:10.1159/000155796

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

The activity in the gustatory nerve from the anterior part of the tongue, the chorda tympani proper nerve, has been recorded during stimulation of the tongue of a New World monkey, Saguinus midas tamarin. A series of 0.3 m sugars and 0.07 m NaCl, 0.07 m sucrose, 0.004 m acetic acid and 0.00005 m quinine hydrochloride were used as taste stimuli. The concentrations of the last four stimuli were the same as those earlier found to be the lowest concentrations at which this monkey in behavioural experiments discriminates between them and water. The records showed that these threshold concentrations all elicited a neural response. Further, the neural activities during stimulation with the series of 0.3 m sugars were recorded. Using the amplitudes of the responses as a measure, the order between them was found to be fructose > glucose > lactose > arabinose > sucrose = galactose > raffinose. This order was discussed and related with the order found in behavioural experiments. With both methods, fructose seemed to be the strongest stimulus, but then the order among the sugars differed.

ISSN:0015-5713    

DOI:10.1159/000155797

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

This is a study of the effects of geographic transfer on the timing of seasonal breeding of free-living rhesus monkeys on Cayo Santiago and La Parguera islands in Puerto Rico. The results demonstrated a progressive shift in the breeding season of the transferred group. The full shift required a period of 2 years. Change from one environment to another produced shifts in onset of estrous. The explanation for this phenomenon proposes an interaction between the specific reproductive state of the female, which may or may not be sensitive to a particular environmental change, and the environmental variation which is correlated with onset of breeding.

ISSN:0015-5713    

DOI:10.1159/000155798

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

Restudy of virtually all of the important collections of European Eocene primates of the family Adapidae indicates that 28 valid species in 8 genera are now known, spanning a time period of nearly 20 million years. The biostratigraphic distribution of each species has been studied in the context of established reference levels, and a maximum of four evolutionary lineages are known from any one locality. Ten new species are proposed in the genera Pelycodus (1 sp.), Protoadapis (4 sp.), Periconodon (2 sp.), Anchomomys (1 sp.), and Adapts (2 sp.). Phylogenetic relationships among the species, based on stratophenetic linking, are indicated whenever possible.

ISSN:0015-5713    

DOI:10.1159/000155799

出版商:S. Karger AG    

年代:1977

数据来源: Karger