First Ordovician vertebrate from south America

Gagnier, Pierre-Yves; Blieck, Alain; Rodrigo, S Gabriela

doi:10.1016/s0016-6995(86)80058-4

Cited by 44 publications

(20 citation statements)

References 6 publications

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“… Palaeogeographical distribution of arandaspids around the margins of the Gondwana supercontinent. Locality 1, Anzaldo Formation, Bolivia (Gagnier et al. 1986); 2, Sepulturas Formation, Argentina (Albanesi and Astini 2002); 3, Trapiche Group, Argentina (Albanesi et al.…”

Section: Palaeogeographical Conclusionmentioning

confidence: 99%

“…Ritchie and Gilbert‐Tomlinson (1977) were the first to describe arandaspids based upon collections from the Amadeus Basin in central Australia, with subsequent work by Ritchie (1985) and Young (1997) extending the taxonomic and stratigraphical range of pteraspidomorphs within the Larapinta Group. The description of allied taxa in Bolivia (Gagnier et al. 1986), the Precordillera of Argentina (Albanesi et al.…”

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confidence: 99%

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Ordovician Fish From the Arabian Peninsula

Sansom¹,

Miller

Heward³

et al. 2009

Palaeontology

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Over the past three decades Ordovician pteraspidomorphs (armoured jawless fish) have been recorded from the fringes of the Gondwana palaeocontinent, in particular Australia and South America. These occurrences are dominated by arandaspid agnathans, the oldest known group of vertebrates with extensive biomineralisation of the dermoskeleton. Here we describe specimens of arandaspid agnathans, referable to the genus Sacabambaspis Gagnier, Blieck and Rodrigo, from the Ordovician of Oman, which represent the earliest record of pteraspidomorphs from the Arabian margin of Gondwana. These are among the oldest arandaspids known, and greatly extend the palaeogeographical distribution of the clade around the periGondwanan margin. Their occurrence within a very narrow, nearshore ecological niche suggests that similar Middle Ordovician palaeoenvironmental settings should be targeted for further sampling.

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Section: Palaeogeographical Conclusionmentioning

confidence: 99%

mentioning

confidence: 99%

Ordovician Fish From the Arabian Peninsula

Sansom¹,

Miller

Heward³

et al. 2009

Palaeontology

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“…However, the last few decades have also seen an acceleration in the discovery of additional pre-Silurian vertebrate localities in Australia (Ritchie and Gilbert-Tomlinson 1977;Young 1997), South America (Gagnier et al 1986;Albanesi et al 1995), North America (Eliuk 1973;Lehtola 1973;Ossian and Halseth 1976;Darby 1982) and the former Soviet Union (Karataj ut_ e-Talimaa 1997; Märss and Karataj ut_ e-Talimaa 2002). We document here a more diverse microvertebrate fauna than has hitherto been reported from the Winnipeg Formation along the eastern flank of the Bighorn Mountains, Wyoming, USA (Text- fig.…”

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confidence: 99%

“…The first pre-Silurian vertebrates to be discovered came from the Harding Sandstone Formation of Cañon City, Colorado (Walcott 1892;Darton 1906), and this unit has continued to be a focal point for the study of early vertebrates (Elliott 1987;Sansom et al 1996Sansom et al , 1997Sansom et al , 2001aSmith and Sansom 1997). However, the last few decades have also seen an acceleration in the discovery of additional pre-Silurian vertebrate localities in Australia (Ritchie and Gilbert-Tomlinson 1977;Young 1997), South America (Gagnier et al 1986;Albanesi et al 1995), North America (Eliuk 1973;Lehtola 1973;Ossian and Halseth 1976;Darby 1982) and the former Soviet Union (Karataj ut_ e-Talimaa 1997;Märss and Karataj ut_ e-Talimaa 2002). We document here a more diverse microvertebrate fauna than has hitherto been reported from the Winnipeg Formation along the eastern flank of the Bighorn Mountains, Wyoming, USA (Text- fig.…”

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confidence: 99%

Late Ordovician vertebrates from the Bighorn Mountains of Wyoming, USA

Sansom¹,

Smith²

2005

Palaeontology

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Late Ordovician vertebrate faunas occur in clastic sedimentary units along the length of the Rocky Mountains from Colorado to Montana, and across the border into Canada. Most research has, however, been conducted on localities in the southern part of the outcrop belt, particularly the Harding Sandstone Formation of Colorado. Micropalaeontological sampling of the coeval South Piney Member (Winnipeg Formation) in the Bighorn Mountains of Wyoming has revealed an abundant vertebrate fauna. The vertebrate assemblage includes a low-abundance fauna of 13 conodont taxa that together indicate an undatus Chronozone age (midMohawkian; mid-Caradoc; Late Ordovician). The pteraspidomorphs Astraspis desiderata Walcott and Eriptychius americanus Walcott are also present together with one new taxon, Eleochera glossa gen. et sp. nov., which is interpreted as a derived stem-gnathostome on the basis of its scale histology and morphology. The fauna bears a strong similarity to that of the Harding Sandstone but is of lower diversity. In particular, it lacks the fine-grained, deeper water component of the Harding Sandstone that contains, inter alia, thelodonts and stem-chondrichthyans.

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“…In addition, Sacabambaspis had been described from the Caradoc of Bolivia by Gagnier et al (1986) and was considered to be closely related to Arandaspis (Gagnier et al 1986;Elliott et aL 1991). The most diverse vertebrate fauna was thought to be that from the Harding Sandstone (Caradoc) of Colorado, USA, which had been the first locality to yield pre-Silurian vertebrates.…”

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confidence: 99%

The spatial and temporal diversification of Early Palaeozoic vertebrates

Smith

Donoghue

Sansom

2002

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Recent discoveries have dramatically altered traditional views of the stratigraphic distribution and phylogeny of Early Palaeozoic vertebrates and permit a reappraisal of biogeographic patterns and processes over the first 120 million years of vertebrate evolution. Stratigraphic calibration of the phylogenetic trees indicates that most of the pre-Silurian record can be inferred only through ghost ranges.

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First Ordovician vertebrate from south America

Cited by 44 publications

References 6 publications

Ordovician Fish From the Arabian Peninsula

Ordovician Fish From the Arabian Peninsula

Late Ordovician vertebrates from the Bighorn Mountains of Wyoming, USA

The spatial and temporal diversification of Early Palaeozoic vertebrates

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