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Pterygometopidae

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Journal Article

Ordovician Pterygometopidae (Trilobita) of North America Free

Rolf Ludvigsen, Brian D. E. Chatterton
Published: 01 November 1982
Canadian Journal of Earth Sciences (1982) 19 (11): 2179–2206.
DOI: https://doi.org/10.1139/e82-192
...Rolf Ludvigsen; Brian D. E. Chatterton Abstract Pterygometopidae are common trilobites in Middle and Upper Ordovician rocks of North America, northern Europe, and Siberia and they have considerable biogeographic usefulness. The subfamilies Pterygometopinae and Chasmopinae characterize Baltica...
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Journal Article

Metamorphosed Trilobites from Arvonia, Virginia Available to Purchase

C. G TILLMAN
Journal: GSA Bulletin
Published: 01 April 1970
GSA Bulletin (1970) 81 (4): 1189–1200.
DOI: https://doi.org/10.1130/0016-7606(1970)81[1189:MTFAV]2.0.CO;2
...-family Calymeninae, one to the genus Gravicalymene (?), one to the Family Calymenidae (?), one to the Family Pterygometopidae, and two to Order Undetermined. The age suggested by these trilobites is Middle or Late Ordovician. This is consistent with previous determinations which were based on the whole...
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 Figure7—Size-frequency diagrams obtained from measurements of the width as a function of the length exhibiting dimensional classes for both protaspides and earliest meraspid cranidia of Nephranops incisus incisus (Roemer, 1866); additional protaspides of Pterygometopidae have been included for comparison (data after Chatterton, 1980 and Brenner et al., submissed).

Figure 7 —Size-frequency diagrams obtained from measurements of the width ... Available to Purchase

Published: 01 July 2007
Figure 7 —Size-frequency diagrams obtained from measurements of the width as a function of the length exhibiting dimensional classes for both protaspides and earliest meraspid cranidia of Nephranops incisus incisus ( Roemer, 1866 ); additional protaspides of Pterygometopidae have been included
Journal Article

Postembryonic development of Dalmanitina , and the evolution of facial suture fusion in Phacopina Available to Purchase

Harriet B. Drage, Lukáš Laibl, Petr Budil
Journal: Paleobiology
Published: 01 November 2018
Paleobiology (2018) 44 (4): 638–659.
DOI: https://doi.org/10.1017/pab.2018.31
... bars, 1 mm. When compared with protaspides of the other phacopine families Phacopidae and Pterygometopidae, the dalmanitid protaspides lack the highly bulbous nonadult-like (pre-metamorphic) stage (see also Crônier 2007 ), instead showing only adult-like stages. All described postmetamorphic...
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Journal Article

LARVAL MORPHOLOGY AND ONTOGENY OF AN UPPER DEVONIAN PHACOPID: NEPHRANOPS FROM THURINGIA, GERMANY Available to Purchase

CATHERINE CRÔNIER
Published: 01 July 2007
Journal of Paleontology (2007) 81 (4): 684–700.
DOI: https://doi.org/10.1666/pleo0022-3360(2007)081[0684:LMAOOA]2.0.CO;2
...Figure 7 —Size-frequency diagrams obtained from measurements of the width as a function of the length exhibiting dimensional classes for both protaspides and earliest meraspid cranidia of Nephranops incisus incisus ( Roemer, 1866 ); additional protaspides of Pterygometopidae have been included...
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View PDF for article title, LARVAL MORPHOLOGY AND ONTOGENY OF AN UPPER DEVONIAN PHACOPID: NEPHRANOPS FROM THURINGIA, GERMANY
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Journal Article

Systematics and paleobiogeographic significance of the Upper Ordovician pterygometopine trilobite Achatella Delo, 1935 Available to Purchase

Robert E. Swisher, Stephen R. Westrop, Lisa Amati
Published: 01 January 2016
Journal of Paleontology (2016) 90 (1): 59–77.
DOI: https://doi.org/10.1017/jpa.2015.71
... of the genus from new and archival specimens from Oklahoma, Missouri, Illinois, Kentucky, and Ontario. Ludvigsen and Chatterton’s ( 1982 ) study of Pterygometopidae proposed a traditional, stratigraphic phylogeny in which Pterygometopinae was represented by Achatella , Pterygometopus , and Estoniops...
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Journal Article

The Late Palaeozoic trilobites of Iran and Armenia and their palaeogeographical significance Available to Purchase

RUDY LEROSEY-AUBRIL
Published: 27 April 2012
Geological Magazine (2012) 149 (6): 1023–1045.
DOI: https://doi.org/10.1017/S0016756812000179
... B. D. E. 1982 . Ordovician Pterygometopidae (Trilobita) of North America . Canadian Journal of Earth Sciences 19 , 2179 –206. Mistiaen B. , Gholamalian H...
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Journal Article

Ordovician Trilobites from the Romaine and Mingan Formations (Ibexian-Late Whiterockian), Mingan Islands, Quebec Available to Purchase

Frederick C. Shaw, Thomas E. Bolton
Published: 01 May 2011
Journal of Paleontology (2011) 85 (3): 406–441.
DOI: https://doi.org/10.1666/10-062.1
.... Chatterton B. D. E. 1982 Ordovician Pterygometopidae (Trilobita) of North America Canadian Journal of Earth Sciences 19 2179 2296 Marek L. 1952 Přispěvek ke stratigrafii...
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Book Chapter

A synopsis of Ordovician trilobite distribution and diversity Available to Purchase

Author(s)
Jonathan M. Adrain
Book: Early Palaeozoic Biogeography and Palaeogeography
Series: Geological Society, London, Memoirs
Publisher: Geological Society of London
Published: 01 January 2013
DOI: 10.1144/M38.20
EISBN: 9781862396425
... have been published. Family Lichidae Hawle & Corda, 1847 Fig. 20.14. Global taxonomic richness of the Family Phacopidae during the Ordovician. See Figure 20.4 for explanation. Family Pterygometopidae...
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Abstract
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Abstract Ordovician trilobites are reviewed based on a new species-level relational database. The stratigraphical ranges of all 56 families with occurrences in the Ordovician are documented and the content, phylogenetic status, diversity and Ordovician distribution by major palaeocontinent/terrane are discussed. Aspects of higher classification are also dealt with. Global sampling is heavily biased towards a small number of highly sampled areas. Much of the world has a very limited record of formally named trilobite species. Even within heavily sampled units, sampling is patchy by environment and time. Genus endemism was at a peak in Laurentia, Baltic, and Avalonia in the Floian and declined more-or-less steadily through the remainder of the Ordovician.