Palaeozoogeographical connections of the Devonian vertebrate communities of the Baltica Province. Part I. Eifelian–Givetian

Lukševičs, Ervīns; Lebedev, Oleg A.; Zakharenko, G.V.

doi:10.1016/j.palwor.2010.02.001

Cited by 16 publications

(4 citation statements)

References 27 publications

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“…Discussion. Moythomasia is known from several European localities (e.g., the Baltics; Bergisch-Gladbach and Brandenberg Group, Germany; Gardiner, 1984;Otto, 1999;Lukševičs et al, 2010) that represent older horizons than the Gogo Formation. However, remains from these sites are known in less satisfactory detail than those from Gogo, so we have adopted a conservative strategy in using the exceptional, thoroughly-described material from this Australian Lagerstätte as the basis for our minimum age for the actinopterygian crown.…”

Section: Crown Actinopterygii (25)mentioning

confidence: 99%

Constraints on the timescale of animal evolutionary history

Benton

Donoghue

Asher

et al. 2015

Palaeontologia Electronica

197

322

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Calibrations published in the Fossil Calibration Series are accessioned into the Fossil Calibration Database (www.fossilcalibrations.org). The Database is a dynamic tool for finding up-to-date calibrations, and calibration data will be updated and annotated as interpretations change. In contrast, the Fossil Calibration papers are a permanent published record of the information on which the calibrations were originally based. Please refer to the Database for the latest data.

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Section: Crown Actinopterygii (25)mentioning

confidence: 99%

Constraints on the timescale of animal evolutionary history

Benton

Donoghue

Asher

et al. 2015

Palaeontologia Electronica

197

322

View full text Add to dashboard Cite

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“…Lobe-fins are known from the late Silurian (ca. 423 Ma) 8 , but the earliest definitive remains of the other division of modern bony fish radiation— actinopterygians—are from the latest Early or earliest Middle Devonian, some 30 million years later 50 . Some scales and other skeletal detritus of late Silurian-Early Devonian age (ca.…”

Section: Palaeozoic Jawed Vertebrates and Their Phylogenymentioning

confidence: 99%

The origin and early phylogenetic history of jawed vertebrates

Brazeau

Friedman

2015

Nature

161

107

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The focus of study for nearly two centuries 1 , fossils of early gnathostomes-or jawed vertebrates -yield key clues about the evolutionary assembly of the bodyplan common to the group, as well the divergence of the two living gnathostome lineages: the cartilaginous and bony fishes 2,3 . A series of remarkable new palaeontological discoveries 4-10 , analytical advances and innovative reinterpretations of old fossils [11][12][13][14] have fundamentally altered a decades-old consensus on the relationships of extinct gnathostomes 15,16 , delivering a new evolutionary framework 3,6,10-14 for exploring major questions which remain unanswered, including the origin of jaws [17][18][19] .Jawed vertebrates (gnathostomes) comprise more than 99% of living vertebrate species, including humans. This diversity is built upon features including jaws, teeth, paired appendages, and specialised embryonic and skeletal tissues (Box 1); centuries of research have attempted to explain their origins 17,18,[20][21][22][23][24] . In particular, jaws and paired appendages have become flagship systems in the study of evolutionary novelty 23,24 -a key research programme in evolutionary biology 25 .The deepest split in the modern gnathostome tree is that between the chondrichthyans (sharks, rays, and chimaeras) and the osteichthyans (bony fishes and tetrapods). This divergence occurred in the Palaeozoic Era, at least 423 million years ago 8 , leaving a vast temporal and evolutionary gulf between modern lineages, with ample time for new innovations to overwrite primitive conditions. These complexities compel researchers to turn to the Palaeozoic fossil record to elucidate the origin of jawed vertebrates. A few wellpreserved fossil taxa from a handful of Silurian-Permian sites in Europe and North America 1 shaped late 19 th and early 20 th century hypotheses of gnathostome evolution 17,26,27 (Fig. 1). Many of these narratives persist to this day, either implicitly or explicitly. However, fossils once hailed as avatars for scenarios of jaw 27,28 or fin 17,29 origins often turn out to be specialized rather than primitive upon phylogenetic investigation 30,31 .Until they are placed in a phylogenetic tree, Palaeozoic fossils are mute on the question of gnathostome origins. In this review, we examine the progress made in the past two decades on the study of early gnathostome interrelationships, focusing on key fossil discoveries that have prompted a renewed intensity of phylogenetic investigation. Phylogeny of extant gnathostomesFrom the perspective of modern lineages alone, deep vertebrate phylogeny is well resolved and there is little disagreement about the branching patterns surrounding the gnathostome crown node (Box 1). Morphological 3 and molecular 2 data unambiguously indicate that chondrichthyans and osteichthyans are each monophyletic sister taxa. Together, they form a clade to the exclusion of the cyclostomes: hagfishes and lamprey (Box 1). Molecular evidence strongly supports the monophyly of living agnathans with respect to jawe...

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“…It is represented by articulated specimens from the late Eifelian of Scotland, the Givetian of Nevada (Reed ; Arratia and Cloutier ) and the Frasnian of Canada, as well as by scales from the Givetian of Germany (Gross ) and Eifelian–Givetian of Belarus, Latvia and Estonia (Blieck and Cloutier ; Mark‐Kurik ; Lukševičs et al . ). As part of his original description, Agassiz (1835) erected three species on the basis of Scottish material: the type species C. trailli from Orkney, C. uragus from Gamrie and C. cummingae from Cromarty.…”

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confidence: 97%

Endoskeletal structure inCheirolepis(Osteichthyes,Actinopterygii), An early ray‐finned fish

et al. 2015

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As the sister lineage of all other actinopterygians, the Middle to Late Devonian (Eifelian–Frasnian) Cheirolepis occupies a pivotal position in vertebrate phylogeny. Although the dermal skeleton of this taxon has been exhaustively described, very little of its endoskeleton is known, leaving questions of neurocranial and fin evolution in early ray‐finned fishes unresolved. The model for early actinopterygian anatomy has instead been based largely on the Late Devonian (Frasnian) Mimipiscis, preserved in stunning detail from the Gogo Formation of Australia. Here, we present re‐examinations of existing museum specimens through the use of high‐resolution laboratory‐ and synchrotron‐based computed tomography scanning, revealing new details of the neuro‐cranium, hyomandibula and pectoral fin endoskeleton for the Eifelian Cheirolepis trailli. These new data highlight traits considered uncharacteristic of early actinopterygians, including an uninvested dorsal aorta and imperforate propterygium, and corroborate the early divergence of Cheirolepis within actinopterygian phylogeny. These traits represent conspicuous differences between the endoskeletal structure of Cheirolepis and Mimipiscis. Additionally, we describe new aspects of the parasphenoid, vomer and scales, most notably that the scales display peg‐and‐socket articulation and a distinct neck. Collectively, these new data help clarify primitive conditions within ray‐finned fishes, which in turn have important implications for understanding features likely present in the last common ancestor of living osteichthyans.

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Palaeozoogeographical connections of the Devonian vertebrate communities of the Baltica Province. Part I. Eifelian–Givetian

Cited by 16 publications

References 27 publications

Constraints on the timescale of animal evolutionary history

Constraints on the timescale of animal evolutionary history

The origin and early phylogenetic history of jawed vertebrates

Endoskeletal structure inCheirolepis(Osteichthyes,Actinopterygii), An early ray‐finned fish

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