The Early Devonian eurypterid Grossopterus overathi (Gross, 1933) from Overath, Germany

Dunlop, Jason A.; Braddy, Simon J.; Tetlie, Erik

doi:10.1002/mmng.20020050107

Cited by 10 publications

(12 citation statements)

References 13 publications

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“…It is possible that pterygotids evolved large size as a way of competing with increasingly large, swift vertebrate predators. Gigantism among Stylonurina cannot be explained through competition with vertebrates, as there are no clearly overlapping niche occupations as is the case with vertebrates and pterygotids (Dunlop et al 2002). It has been suggested that Stylonurina increased in size as a method for drought survival during the arid conditions of the Old Red Sandstone (Rolfe 1985).…”

Section: Discussion (A) Gigantism and Cope's Rulementioning

confidence: 99%

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Cope's Rule and Romer's theory: patterns of diversity and gigantism in eurypterids and Palaeozoic vertebrates

Lamsdell

Braddy

2009

Biol. Lett.

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Gigantism is widespread among Palaeozoic arthropods, yet causal mechanisms, particularly the role of (abiotic) environmental factors versus (biotic) competition, remain unknown. The eurypterids (Arthropoda: Chelicerata) include the largest arthropods; gigantic predatory pterygotids (Eurypterina) during the Siluro-Devonian and bizarre sweep-feeding hibbertopterids (Stylonurina) from the Carboniferous to end-Permian. Analysis of family-level originations and extinctions among eurypterids and Palaeozoic vertebrates show that the diversity of Eurypterina waned during the Devonian, while the Placodermi radiated, yet Stylonurina remained relatively unaffected; adopting a sweep-feeding strategy they maintained their large body size by avoiding competition, and persisted throughout the Late Palaeozoic while the predatory nektonic Eurypterina (including the giant pterygotids) declined during the Devonian, possibly out-competed by other predators including jawed vertebrates.

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Section: Discussion (A) Gigantism and Cope's Rulementioning

confidence: 99%

“…Eurypterids are commonly associated with fishes in around one-third of Silurian and Early Devonian localities (Dunlop et al 2002); pterygotids invariably dominate, except for the stylonurine-dominated faunas in Scotland.…”

Section: Discussion (A) Gigantism and Cope's Rulementioning

confidence: 99%

Cope's Rule and Romer's theory: patterns of diversity and gigantism in eurypterids and Palaeozoic vertebrates

Lamsdell

Braddy

2009

Biol. Lett.

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“…The state of eurypterid systematics was discussed briefly by Dunlop et al . (2002) who recognized that a number of problems exist, in part owing to the large number of taxa based on incomplete or nondescript fossils.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

“…In addition to pterygotid remains, the Atholville sediments contain numerous fish. Associations of pterygotids and fish have been noted previously (Kjellesvig‐Waering 1961, 1964) and reviewed by Dunlop et al . (2002), the commonly held view being that pterygotids were among the chief predators in the middle Palaeozoic world.…”

Section: Palaeoecology and Palaeogeographymentioning

confidence: 99%

PTERYGOTUS ANGLICUS AGASSIZ (CHELICERATA: EURYPTERIDA) FROM ATHOLVILLE, LOWER DEVONIAN CAMPBELLTON FORMATION, NEW BRUNSWICK, CANADA

Miller¹

2007

Palaeontology

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Specimens of the large eurypterid Pterygotus from the Early Devonian Campbellton Formation outcropping at Atholville, New Brunswick, are identified as Pterygotus anglicus Agassiz. The locality, in the Atholville beds near the western end of the Campbellton Formation exposure, is best known for its vertebrate fauna of ostracoderms, arthrodires, acanthodians and chondrichthyans, first described in 1881. Although a significant series of pterygotid fossils was acquired by the Natural History Museum, London, in 1892, it received little attention. A few small specimens from the Geological Survey of Canada collections were named Pterygotus atlanticus by Clarke and Ruedemann, considered here to be an invalid taxon. They suggested that P. atlanticus might turn out to be a small specimen of P. anglicus. The new material described here, including one relatively complete individual, confirms their suspicions and provides evidence of Pterygotus anglicus in the Lower Devonian of North America.

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“…Some authors (Pageau 1968(Pageau , 1969a have considered the Campbellton outcrops equivalent to the Battery Point Formation or the LaGarde and Pirate Cove formations (Wilson et al 2004;Bourque et al 2005) found north of the Bay of Chaleurs in Gaspé, Quebec. Dunlop et al (2002) briefly discussed eurypterid systematics and recognized that a number of problems exist due in part to a large number of taxa based on incomplete or even nondescript fossils. They published a provisional cladogram with suggested synapomorphies for a selected set of taxa including Pterygotus.…”

Section: Location and Geologymentioning

confidence: 99%

Nineteenth century collections of Pterygotus anglicus Agassiz (Chelicerata; Eurypterida) from the Campbellton Formation, New Brunswick, Canada

Miller

2007

atgeol

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The Devonian fauna from the Campbellton Formation of northern New Brunswick was discovered in 1881 at the classic locality in Campbellton. About a decade later A.S. Woodward at the British Museum (Natural History) (now the Natural History Museum, London) acquired specimens through fossil dealer R.F. Damon. Woodward was among the first to describe the fish assemblage of ostracoderms, arthrodires, acanthodians and chondrichthyans. At the same time the museum also acquired specimens of a large pterygotid eurypterid. Although the vertebrates received considerable attention, the pterygotids at the Natural History Museum, London are described here for the first time. The first pterygotid specimens collected in 1881 by the Geological Survey of Canada were later identified by Clarke and Ruedemann in 1912 as Pterygotus atlanticus, although they suggested it might be a variant of Pterygotus anglicus Agassiz. An almost complete pterygotid recovered in 1994 from the Campbellton Formation at a new locality in Atholville, less than two kilometres west of Campbellton, has been identified as P. anglicus Agassiz. Like the specimens described by Clarke and Ruedemann, the material from the Natural History Museum, London is herein referred to P. anglicus. RÉSUMÉ La faune dévonienne de la Formation de Campbellton dans le Nord du Nouveau-Brunswick a été découverte en 1881 à l’emplacement classique de Campbellton. Environ une décennie plus tard, A. S. Woodward, du British Museum (Histoire naturelle) (maintenant le Natural History Museum de Londres) a fait l’acquisition de spécimens par l’entremise du négociant de fossiles R. F. Damon. Woodward a figuré parmi les premiers à décrire l’assemblage de poissons d’ostracodermes, d’arthrodires, d’acanthodiens et de chondrichthyens. Le musée a également fait en même temps l’acquisition de spécimens d’un euryptéridé ptérygotide de fortes dimensions. Même si les vertébrés ont bénéficié d’une attention considérable, les ptérygotides du Natural History Museum de Londres sont décrits aux présentes pour la première fois. Les premiers spécimens de ptérygotides recueillis en 1881 par la Commission géologique du Canada ont ultérieurement été identifiés par Clarke et Ruedemann en 1912 en tant que Pterygotus atlanticus, bien que les chercheurs aient avancé qu’il pourrait s’agir d’une variante du Pterygotus anglicus Agassiz. On a récupéré en 1994 un ptérygotide presque complet de la Formation de Campbellton dans un nouvel emplacement situé à Atholville, à moins de deux kilomètres à l’ouest de Campbellton, lequel a été identifié en tant que P. anglicus Agassiz. À l’instar des spécimens décrits par Clarke et Ruedemann, l’article du Natural History Museum de Londres est cité aux présentes à titre de P. anglicus.

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The Early Devonian eurypterid Grossopterus overathi (Gross, 1933) from Overath, Germany

Cited by 10 publications

References 13 publications

Cope's Rule and Romer's theory: patterns of diversity and gigantism in eurypterids and Palaeozoic vertebrates

Cope's Rule and Romer's theory: patterns of diversity and gigantism in eurypterids and Palaeozoic vertebrates

PTERYGOTUS ANGLICUS AGASSIZ (CHELICERATA: EURYPTERIDA) FROM ATHOLVILLE, LOWER DEVONIAN CAMPBELLTON FORMATION, NEW BRUNSWICK, CANADA

Nineteenth century collections of Pterygotus anglicus Agassiz (Chelicerata; Eurypterida) from the Campbellton Formation, New Brunswick, Canada

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