摘要:

The mouthparts ofXenocheíla zarudnyíUvarov, a grasshopper from Iran, are described, including the distribution of sensilla. The mandibles and labium are of unusual form and the possible significance of this is discusse

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1966.tb02951.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

Marabous are common scavengers in regions where game or domestic animals are abundant or near human settlements. Adults are able to subsist for long periods on a diet of carrion, but the rapidly growing nestlings require a high‐calcium diet containing some small whole vertebrates, such as fish or frogs. Most breeding colonies are situated near a source of carrion as well as a freshwater feeding area. Breeding generally takes place in the dry season, when aquatic vertebrates are concentrated and carrion is easier to obtain. Observations are presented on the various phases of the breeding cycle. The incubation period averaged 30–3 days, and the young stayed in the nest an average of 116 days before their first flight. Parents commonly bring water, as well as food, to young in the nests. Only a small percentage of the population appears to breed in any given year, and the rate of productivity is low; some birds must live to be very old. Population size is probably controlled by food availability and its influence on reproductive succ

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1966.tb02952.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

An account is given of an hermaphrodite specimen ofScyliorhinus caniculuswith asymmetrical ducts and claspers. Possible causes of abnormalities in the reproductive system are discussed.

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1966.tb02953.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

The results of a detailed study on the adhesive apparatus of Indian hill stream cyprinid and sisorid fishes are presented. The structure of the mental suctorial disc in the genusGarrais described. Histological study of the mental region ofCrossocheilusandPsilorhynchushas also been made and compared with the mental disc ofGarra. The muscles of the disc which control its movements in bringing a partial vacuum during adhesion have been investigated. The complexity of the geniohyoideus muscles inGarrais interesting. Variations in the degree of development and histological modifications of the mental disc are exhibited by the fishes of the genusGarra.A thoracic adhesive apparatus in the form of longitudinal or transverse ridges and grooves is present in the sisorids,Laguvia, GlyptothoraxandPseudecheneisexceptGagata. A close study has revealed that the adhesive apparatus of the catfishes works mainly on the principle of friction. The variations in shape, size and location of the adhesive apparatus in various species are correlated to their respective habitats.Structural variation in the adhesive apparatus ofPseudecheneisis maximum in comparison to that inLaguviaandGlyptothorax. It is discovered that the modifications are associated with the presence of multi‐spinous layers, formation of caps by the basal or holdfast cells and with the transformation of loose areolar tissue into thick collagenous dermis. The presence of a pad of adipose tissue in the region of the adhesive apparatus has been reported and its physiological significance as a source of stored food suggested.The anterior part of the protractor ischii muscle is modified to control the action of the adhesive apparatus. InPseudecheneis, besides the m. protractor ischii, the ventral part of m. mesioventral is also associated with the adhesive apparatu

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1966.tb02954.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

An account is given of autopsy examinations of Mammalia, Aves, Reptilia and Amphibia during the year 1963. Statistical analyses of results are added in the tables given.

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1966.tb02955.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

An account is given of autopsy examinations of Mammalia, Aves and Reptilia during the year 1964. Statistical analyses of results are added in the tables given. Various research problems studied during the year are briefly described.

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1966.tb02956.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1966.tb02957.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY