The Trilobite Subfamily Monorakinae (Pterygometopidae)
The Monorakinae is a subfamily of the Pterygometopidae characterised by the fusion of L2 and L3 in the glabella. The resulting bicomposite lobe is expanded backwards to reach the occipital furrow, displacing L1 from contact with the axial furrow and causing the realignment of S1 to a markedly obliqu...
Published in: | Palaeontology |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2004
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/j.0031-0239.2004.00396.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.0031-0239.2004.00396.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.0031-0239.2004.00396.x |
id |
crwiley:10.1111/j.0031-0239.2004.00396.x |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/j.0031-0239.2004.00396.x 2024-06-02T08:14:23+00:00 The Trilobite Subfamily Monorakinae (Pterygometopidae) Holloway, David J. 2004 http://dx.doi.org/10.1111/j.0031-0239.2004.00396.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.0031-0239.2004.00396.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.0031-0239.2004.00396.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Palaeontology volume 47, issue 4, page 1015-1036 ISSN 0031-0239 1475-4983 journal-article 2004 crwiley https://doi.org/10.1111/j.0031-0239.2004.00396.x 2024-05-03T11:36:43Z The Monorakinae is a subfamily of the Pterygometopidae characterised by the fusion of L2 and L3 in the glabella. The resulting bicomposite lobe is expanded backwards to reach the occipital furrow, displacing L1 from contact with the axial furrow and causing the realignment of S1 to a markedly oblique orientation. The bicomposite lobe is commonly bounded adaxially by a longitudinal furrow containing three pairs of apodemal pits. The Monorakinae was probably derived from the Pterygometopinae, and includes the genera and subgenera Monorakos , Carinopyge , Ceratevenkaspis , Elasmaspis , Evenkaspis ( Evenkaspis ) and E . ( Parevenkaspis ), of which Carinopyge , Elasmaspis and Evenkaspis ( Parevenkaspis ) are known only from limited parts of the exoskeleton. Monorakines have a stratigraphical range of Caradoc–Ashgill. Their known geographical distribution in the Siberian Platform, Taimyr, the Russian Far East, and the Seward Peninsula of Alaska is restricted to areas that in the Ordovician were part of the palaeocontinents of Siberia and Arctida, which must have been connected or situated close together at that time. The occurrence of monorakines in the Taimyr Peninsula but their absence from Baltica does not support the suggestion of some workers that Taimyr was part of Baltica in the Ordovician. Article in Journal/Newspaper Seward Peninsula Taimyr Alaska Siberia Wiley Online Library Palaeontology 47 4 1015 1036 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
The Monorakinae is a subfamily of the Pterygometopidae characterised by the fusion of L2 and L3 in the glabella. The resulting bicomposite lobe is expanded backwards to reach the occipital furrow, displacing L1 from contact with the axial furrow and causing the realignment of S1 to a markedly oblique orientation. The bicomposite lobe is commonly bounded adaxially by a longitudinal furrow containing three pairs of apodemal pits. The Monorakinae was probably derived from the Pterygometopinae, and includes the genera and subgenera Monorakos , Carinopyge , Ceratevenkaspis , Elasmaspis , Evenkaspis ( Evenkaspis ) and E . ( Parevenkaspis ), of which Carinopyge , Elasmaspis and Evenkaspis ( Parevenkaspis ) are known only from limited parts of the exoskeleton. Monorakines have a stratigraphical range of Caradoc–Ashgill. Their known geographical distribution in the Siberian Platform, Taimyr, the Russian Far East, and the Seward Peninsula of Alaska is restricted to areas that in the Ordovician were part of the palaeocontinents of Siberia and Arctida, which must have been connected or situated close together at that time. The occurrence of monorakines in the Taimyr Peninsula but their absence from Baltica does not support the suggestion of some workers that Taimyr was part of Baltica in the Ordovician. |
format |
Article in Journal/Newspaper |
author |
Holloway, David J. |
spellingShingle |
Holloway, David J. The Trilobite Subfamily Monorakinae (Pterygometopidae) |
author_facet |
Holloway, David J. |
author_sort |
Holloway, David J. |
title |
The Trilobite Subfamily Monorakinae (Pterygometopidae) |
title_short |
The Trilobite Subfamily Monorakinae (Pterygometopidae) |
title_full |
The Trilobite Subfamily Monorakinae (Pterygometopidae) |
title_fullStr |
The Trilobite Subfamily Monorakinae (Pterygometopidae) |
title_full_unstemmed |
The Trilobite Subfamily Monorakinae (Pterygometopidae) |
title_sort |
trilobite subfamily monorakinae (pterygometopidae) |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.1111/j.0031-0239.2004.00396.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.0031-0239.2004.00396.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.0031-0239.2004.00396.x |
genre |
Seward Peninsula Taimyr Alaska Siberia |
genre_facet |
Seward Peninsula Taimyr Alaska Siberia |
op_source |
Palaeontology volume 47, issue 4, page 1015-1036 ISSN 0031-0239 1475-4983 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.0031-0239.2004.00396.x |
container_title |
Palaeontology |
container_volume |
47 |
container_issue |
4 |
container_start_page |
1015 |
op_container_end_page |
1036 |
_version_ |
1800738202428899328 |