Skip to main content Accessibility help
×
Home
Hostname: page-component-55597f9d44-l69ms Total loading time: 0.398 Render date: 2022-08-13T00:43:40.391Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "useRatesEcommerce": false, "useNewApi": true } hasContentIssue true

Book contents

21 - Evolution of the platform elements of the conodont genus Metapolygnathus and their distribution in the Upper Triassic of Sikhote-Alin

Published online by Cambridge University Press:  13 October 2009

J. M. Dickins
Affiliation:
Australian Geological Survey Organisation, Canberra
Yang Zunyi
Affiliation:
China University of Geosciences, Wukan
Yin Hongfu
Affiliation:
China University of Geosciences, Wukan
S. G. Lucas
Affiliation:
New Mexico Museum of Natural History
S. K. Acharyya
Affiliation:
Geological Survey of India
Get access

Summary

The late Triassic was the time interval of greatest morphologic diversity for the conodont genera. Those short-ranging taxa, with distinctive shapes, often were represented by only a few species, and they have proved particularly useful, serving as excellent biostratigraphic keys (e.g., Paragondolella, Metapolygnathus, Epigondolella, and Misikella). The genus Metapolygnathus is regarded as characteristic of the Tuvalian, Lacian, and Alaunian. Its morphology has not been adequately investigated, and the species composition has been recognized only to a first approximation. The literature data on this problem are very contradictory (Hayashi, 1968; Kozur, 1972; Mosher, 1973; Budurov, 1977; Krystyn, 1980; Orchard, 1991).

I have recognized six species of Metapolygnathus in the Upper Triassic of Sikhote-Alin. This genus is defined in the paper by S. Hayashi's (1968) original diagnosis, aided by K. Budurov (1977). Those sources provided the basis for this chapter.

Phylogenetic relationships of the Metapolygnathus platform elements

The reconstructed organisms described as Metapolygnathus represent conodont elements that, along with the platform elements discussed here, contain such elements as cypridodelliform, hindeodelliform, chirodelliform, diplododelliform, prioniodelliform, and enantiognathiform structures (Buryi, 1985). Metapolygnathus was erected by Hayashi in 1968, with M. communisti as the type species, collected from cherts of the Adoyama Formation in the Ashio Mountains, central Japan.

Type
Chapter
Information
Publisher: Cambridge University Press
Print publication year: 1997

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)
1
Cited by

Save book to Kindle

To save this book to your Kindle, first ensure coreplatform@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.

Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Available formats
×

Save book to Dropbox

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.

Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

Available formats
×