年代:1951 |
|
|
Volume 27 issue 2
|
|
1. |
On the Development of the Chondrocranium and Visceral Arches of Leiopelma archeyi. |
|
The Transactions of the Zoological Society of London,
Volume 27,
Issue 2,
1951,
Page 203-253
N. G. Stephenson,
Preview
|
PDF (5089KB)
|
|
摘要:
SummaryA description, based on a microscopic study of one species,Leiopelma archeyiTurbott, attempts to provide the first detailed account of development in the New Zealand frog,Leiopelma.Previously only the general features of the intracapsular and post‐hatching development of this frog were known. As far as possible, close comparison has been made with the developmental features of the North American genus,Ascaphus, the only other member of the same primitive Anuran family.The development of the chondrocranium and visceral arches ofLeiopelma archeyiis followed through intracapsular and post‐hatching stages. In the comparative section certain outstanding features of development are considered. An account of previous views on the nature of the basal connection of the quadrate to the neurocranium inLeiopelmaandAscaphusis given. Finally, a theory relative to the basal connection of the quadrate and the nature of the jaw suspension in Amphibia is suggested, and the absence of certain middle‐ear structures in all Urodela and in both these primitive Anurans is disc
ISSN:0084-5620
DOI:10.1111/j.1096-3642.1951.tb00229.x
出版商:Blackwell Publishing Ltd
年代:1951
数据来源: WILEY
|
2. |
The Anatomy of the Head of the New Zealand Frog, Leiopelma |
|
The Transactions of the Zoological Society of London,
Volume 27,
Issue 2,
1951,
Page 255-305
Elsie M. Stephenson,
Preview
|
PDF (4290KB)
|
|
摘要:
Summary.An attempt has been made to present a full account of the anatomy of the head (exclusive of the inner ear) ofLeiopelma.Material from two species,Leiopelma archeyiandLeiopelma hochstetteri, has been studied and the head of the latter is here described for the first time.As far as possible, comparison has been made with the head ofAscaphus, the only other genus included in the same primitive anuran family.Specific differences betweenLeiopelma archeyiandLeiopelma hochstetteriare described and listed.A possible homology is suggested between the processus lingularis of Anura and Seydel's palatal process of Urodela.Particular emphasis is placed on the controversial topic of the basal connection between the quadrate and the neurocranium. An historical account of previous ideas on this subject is included, followed by a discussion based on the view that the ‘basal’ or ‘pseudobasal’ process ofLeiopelma, together with the ledge of cartilage forming the floor of the hyomandibular canal, are of hyoid
ISSN:0084-5620
DOI:10.1111/j.1096-3642.1951.tb00230.x
出版商:Blackwell Publishing Ltd
年代:1951
数据来源: WILEY
|
|