THE GENUS<i>GIGANTASPIS</i>HEINTZ, 1962 (VERTEBRATA, HETEROSTRACI) FROM THE LOWER DEVONIAN OF SPITSBERGEN

Pernègre, Vincent Noël; Goujet, Daniel

doi:10.1111/j.1475-4983.2007.00638.x

Cited by 10 publications

(72 citation statements)

References 16 publications

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“…—C. Strict consensus tree of two equiparsimonious results to place the genus Gigantaspis within the Pteraspidiformes (modified from Pernègre & Goujet 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Pernègre & Goujet (2007) is the most recent account in which a computerized cladistic analysis of the Pteraspidiformes has been attempted, in this case in order to integrate the genus Gigantaspis (Fig. 2C).…”

Section: Introductionmentioning

confidence: 99%

“…2C). This analysis, composed of 12 taxa and 45 characters, is the most complete on the order to date (Pernègre & Goujet 2007, text figs 11 and 12) and builds on the analysis of Pernègre (2002) by increasing the number of characters from the cephalo‐thoracic armour. The outgroup was chosen among the Protopteraspididae and the result highlighted relationships between the Pteraspididae, Gigantaspis, and Protaspididae.…”

Section: Introductionmentioning

confidence: 99%

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Phylogeny of the Pteraspidiformes (Heterostraci), Silurian–Devonian jawless vertebrates

Pernègre¹,

Elliott²

2008

Zoologica Scripta

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The Pteraspidiformes are an order of armoured agnathans of Silurian and Devonian age composed of five families: the Anchipteraspididae, Protopteraspididae, Pteraspididae, Protaspididae and Psammosteidae. Relationships within the order are poorly known and although past attempts have been made to represent the state of knowledge in this area none have attempted a rigorous computer-based analysis. Here we present the results of the cladistic analysis on a matrix comprising 25(+1) taxa and 59 characters using W INCLADA . The first analysis was run without any representative of the Psammosteidae and supports the presence of five groups within the order although one, the 'Protopteraspididae', is paraphyletic and a second, the Gigantaspididae, is newly recognized. In a second analysis the addition of the psammosteid Drepanaspis gemuendenensis results in a better resolved tree in which the basal family, the Anchipteraspididae, are clearly monophyletic and in which the Psammosteidae, as represented by Drepanaspis , is the next less inclusive. This is contrary to the previous view that the psammosteids were an advanced clade within the Pteraspidiformes.

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“…—C. Strict consensus tree of two equiparsimonious results to place the genus Gigantaspis within the Pteraspidiformes (modified from Pernègre & Goujet 2007).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phylogeny of the Pteraspidiformes (Heterostraci), Silurian–Devonian jawless vertebrates

Pernègre¹,

Elliott²

2008

Zoologica Scripta

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“…Characters used in the phylogenetic analysis were obtained from direct study, published descriptions, or were taken unchanged or adapted from previous phylogenies (Ilyes and Elliott 1994;Pernègre, 2002;Pernègre and Goujet, 2007;Pernègre and Elliott, 2008;Randle and Sansom, 2016) (Appendix 1). Figure 2 provides a visual explanation of some ratios of plates, which were used in character codings.…”

Section: Characters Coding Methods and Data Analysismentioning

confidence: 99%

“…After ch.42 of Pernègre & Elliott (2008). Also ch.31 of Pernègre & Goujet (2007) and ch.61 of Randle & Sansom (2016). Note: In the analisys have used data on juvenile Placosteus undulatus in which represented the lateral line system.…”

Section: Appendix 1 List Of Charactersmentioning

confidence: 99%

Phylogenetic relationships of psammosteid heterostracans (Pteraspidiformes), Devonian jawless vertebrates

Glinskiy

2017

BioComm

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Psammosteid heterostracans are a group (suborder Psammosteoidei) of Devonian-age jawless vertebrates, which is included in the order Pteraspidiformes. The whole group of psammosteids is represented by numerous species (more than 40); their phylogenetic relationships are still poorly known and deserve further study. Classical researchers of the psammosteids, such as D. Obruchev, E. Mark-Kurik and L. Halstead Tarlo, had different views on the phylogeny of the group (e.g. origins and evolution of Psammosteus). To check the modern hypotheses of psammosteid origins from various Pteraspidiformes and to clarify psammosteid interrelationships, the most complete phylogeny of this group (38 ingroup taxa + juvenile Drepanapsis) is presented here. Different methods of data analysis were used to explore the psammosteid data set, including equally weighted characters versus implied weighting. According to the results of the phylogenetic analysis, the monophyletic status of the group and their early development from the Pteraspidiformes are supported. The diagnoses and interrelationships of many taxa are clarified. Two new genera are proposed (Vladimirolepis gen. nov. and Elgaia gen. nov.), and two subfamilies are erected (Placosteinae subfam nov. and Psammosteinae Traquair).

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The last pteraspids (Vertebrata, Heterostraci): new material from the Middle Devonian of Alberta and Idaho

2020

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This report documents the last pteraspids, (armored, jawless members of the Heterostraci), which are otherwise only known from the Early Devonian of the Old Red Sandstone Continent. Tuberculate pteraspid heterostracans are described from the Middle Devonian beds of two formations in western North America. The late Givetian Yahatinda Formation of Alberta and British Columbia consists of channels cut into lower Paleozoic rocks and represents deposition in marine to littoral environments. Clavulaspis finis (Elliott et al., 2000a) new combination is redescribed from additional material from the Yahatinda Formation and reassigned to the new genus Clavulaspis because the original genus name is invalid. The Eifelian Spring Mountain beds of Idaho consist of a large channel that represents a clastic-dominated estuarine environment. It contains Scutellaspis wilsoni new genus new species, and the previously described species from the Spring Mountain beds is redescribed and reassigned to Ecphymaspis new genus, which was prompted by new material and a review of the validity of the original genus name. Phylogenetic analysis shows that these three new taxa form part of the derived clade Protaspididae.UUID: http://zoobank.org/9cf09b21-cec1-4ce4-bc2b-658d0b515e10

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THE GENUSGIGANTASPISHEINTZ, 1962 (VERTEBRATA, HETEROSTRACI) FROM THE LOWER DEVONIAN OF SPITSBERGEN

Cited by 10 publications

References 16 publications

Phylogeny of the Pteraspidiformes (Heterostraci), Silurian–Devonian jawless vertebrates

Phylogeny of the Pteraspidiformes (Heterostraci), Silurian–Devonian jawless vertebrates

Phylogenetic relationships of psammosteid heterostracans (Pteraspidiformes), Devonian jawless vertebrates

The last pteraspids (Vertebrata, Heterostraci): new material from the Middle Devonian of Alberta and Idaho

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