摘要:

This paper is a study of the ways in which direct observation of the morphology of organisms, and indirect inferences about the kinds of morphological change that may take place in phylo‐geny, interact in the formation of judgements about homology. The dispute about the correct identification of dermal skull‐roof bones in the osteolepiform and porolepiform rhipidistian fishes is used to illustrate the various issues. Some suggestions are made about the ways in which such disputes maybe resol

ISSN:0024-4066    

DOI:10.1111/j.1095-8312.1969.tb00125.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY

摘要:

Lake Victoria has long been advanced as an example of a lake in which the physical limnological changes have proceeded side by side with biological changes. The paper summarizes recent geological findings and indicates the necessity of revising assumptions made in the biological literature concerning the geological evolution of the lake. It is argued that the revised geological history provides a simple explanation of the main features of the lake ichthyofauna. It is also consistent with the known biological changes.A mid‐Pleistocene inception is postulated for the lake; it was formed as a shallow basin resulting from cross‐warping of a well‐developed westward‐flowing plateau drainage. In its early stages, as the pre‐lake rivers were ponded‐up, several separate dendritic, swampy lakes must have existed. These gradually became interconnected, lost their outlet to the west and were drained northwards by the Nile. Subsequent fluctuations in level have been generally negative and have resulted from incision of the lake outflow not clim

ISSN:0024-4066    

DOI:10.1111/j.1095-8312.1969.tb00126.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY

摘要:

A new method is described whereby genera are classified numerically intofaunal centresin terms of similarity of geographical distribution and similarity of centres of speciation. The method is exemplified by a survey of butterfly genera found in India. The results are related to evidence of drift in southern India in the Tertiary.

ISSN:0024-4066    

DOI:10.1111/j.1095-8312.1969.tb00127.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY

ISSN:0024-4066    

DOI:10.1111/j.1095-8312.1969.tb00128.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY

ISSN:0024-4066    

DOI:10.1111/j.1095-8312.1969.tb00125a.x

出版商:Blackwell Publishing Ltd    

年代:1969

数据来源: WILEY