A new genus of placoderm (Arthrodira: ‘Actinolepida’) from the Lower Devonian of Podolia (Ukraine)

Dupret, Vincent; Goujet, Daniel; Mark-Kurik, Elga

doi:10.1671/0272-4634(2007)27[266:angopa]2.0.co;2

Cited by 21 publications

(38 citation statements)

References 6 publications

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“…In the strict consensus tree, the 'Actinolepidoidei' are paraphyletic (nodes 1 to 22) but their internal relationships are different from those published earlier (Dupret, 2004;Dupret, Goujet & Mark-Kurik, 2007). The Arthrodira are monophyletic (node 1).…”

Section: E Phylogenetic Analysismentioning

confidence: 77%

“…This character is a derived feature shared by the superfamily Kujdanowiaspidoidea (sensu V. Dupret, unpub. Ph.D. thesis, Muséum National d'Histoire Naturelle, 2003;Dupret, Goujet & Mark-Kurik, 2007) and by the derived Phyllolepida (Austrophyllolepis and Phyllolepis; Cowralepis displays a fenestra rather than a real contact between the postorbital and paranuchal plates; see Ritchie, 2005, Fig. 20).…”

Section: Systematic Palaeontologymentioning

confidence: 99%

“…This is a derived character displayed by the family Kujdanowiaspididae (sensu V. Dupret, unpub. Ph.D. thesis, Muséum National d'Histoire Naturelle, 2003and Dupret, Goujet & Mark-Kurik, 2007, non Berg, 1955, 1958, but unknown in the Phyllolepida. It is noteworthy that the outline of the marginal plate is poorly known in the early Arthrodira Wuttagoonaspis (Ritchie, 1973) and Antarctaspis (White, 1968, non Denison, 1978.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

“…An endolymphatic duct is unknown in the Phyllolepididae (except possibly for Cowralepis; see below), where an external foramen on the paranuchal plate has never been found. Consequently, some characters referring to these structures in the previous phylogenetic analyses were coded as not applicable (Dupret, 2004;Dupret, Goujet & Mark-Kurik, 2007). Optimization of these 'missing data' by the software supported a close relationship between the Phyllolepida and the Phlyctaenioidei (Dupret, 2004;Dupret, Goujet & Mark-Kurik, 2007), but Young (2005b) considered this evidence of relationship as artificial (along with other character discussions mentioned below).…”

Section: A the Endolymphatic Duct In The Phyllolepidamentioning

confidence: 99%

“…Consequently, some characters referring to these structures in the previous phylogenetic analyses were coded as not applicable (Dupret, 2004;Dupret, Goujet & Mark-Kurik, 2007). Optimization of these 'missing data' by the software supported a close relationship between the Phyllolepida and the Phlyctaenioidei (Dupret, 2004;Dupret, Goujet & Mark-Kurik, 2007), but Young (2005b) considered this evidence of relationship as artificial (along with other character discussions mentioned below). Nevertheless, the discovery in Cobandrahlepis (Young, 2005c, Figs 3A-C, 4A-B, m.pr) and in Cowralepis (Ritchie, 2005, Figs 7F-G, mp.PNu) of an anterior oblique internal mesial process on the paranuchal plate could be interpreted as a vestigial endolymphatic duct in the Phyllolepida.…”

Section: A the Endolymphatic Duct In The Phyllolepidamentioning

confidence: 99%

See 4 more Smart Citations

The earliest phyllolepid (Placodermi, Arthrodira) from the Late Lochkovian (Early Devonian) of Yunnan (South China)

Dupret

Zhu

2007

Geol. Mag.

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Gavinaspis convergens, a new genus and species of the Phyllolepida (Placodermi: Arthrodira), is described on the basis of skull remains from the Late Lochkovian (Xitun Formation, Early Devonian) of Qujing (Yunnan, South China). This new form displays a mosaic of characters of basal actinolepidoid arthrodires and more derived phyllolepids. A new hypothesis is proposed concerning the origin of the unpaired centronuchal plate of the Phyllolepida by a fusion of the paired central plates into one single dermal element and the loss of the nuchal plate. A phylogenetic analysis suggests the position of Gavinaspis gen. nov. as the sister group of the Phyllolepididae, in a distinct new family (Gavinaspididae fam. nov.). This new form suggests a possible Chinese origin for the Phyllolepida or that the common ancestor to Phyllolepida lived in an area including both South China and Gondwana, and in any case corroborates the palaeogeographic proximity between Australia and South China during the Devonian Period.

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Section: E Phylogenetic Analysismentioning

confidence: 77%

Section: Systematic Palaeontologymentioning

confidence: 99%

Section: Systematic Palaeontologymentioning

confidence: 99%

Section: A the Endolymphatic Duct In The Phyllolepidamentioning

confidence: 99%

Section: A the Endolymphatic Duct In The Phyllolepidamentioning

confidence: 99%

See 3 more Smart Citations

The earliest phyllolepid (Placodermi, Arthrodira) from the Late Lochkovian (Early Devonian) of Yunnan (South China)

Dupret

Zhu

2007

Geol. Mag.

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The phyllolepid placoderm Cowralepis mclachlani: Insights into the evolution of feeding mechanisms in jawed vertebrates

Carr

Johanson

Ritchie

2009

Journal of Morphology

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Remarkably preserved specimens of Cowralepis mclachlani Ritchie, 2005 (Proc Linn Soc NSW 126:215-259) (Phyllolepida, Placodermi) represent a unique ontogenetic sequence adding to our understanding of anatomy, function, and phylogeny among basal jawed vertebrates (gnathostomes). A systematic review demonstrates that the Phyllolepida are a subgroup of the Arthrodira. Consideration of visceral and neurocranial characters supports the hypothesis that placoderms are the sister group to remaining gnathostomes. Placoderms possess, as adult plesiomorphic features, a number of characters that are only seen in the development of extant gnathostomes-a peramorphic shift relative to placoderms. Developmental evidence in vertebrates leads to a revised polarity of character transitions. These include 1) hyomandibula-neurocranium and ventral parachordal-palatoquadrate articulations (vertebrate synapomorphies); 2) jointed pharynx, paired basibranchials, anterior ethmoidal-palatoquadrate articulation, short trabeculae cranii, and anterior and posterior neurocranial fissures (gnathostome synapomorphies); and 3) fused basibranchials, dorsal palatoquadrate-neurocranium articulation, loss of the anterior neurocranial fissure, elongated trabeculae cranii, and transfer of the ventral parachordal-palatoquadrate articulation to the trabeculae (crown group gnathostomes). The level of preservation in C. mclachlani provides the basis for a reinterpretation of phyllolepid anatomy and function. Cowralepis mclachlani possesses paired basibranchials allowing the reinterpretation of the visceral skeleton in other placoderms. Mandible depression in C. mclachlani follows an osteichthyan pattern and the ventral visceral skeleton acts as a functional unit. Evidence for hypobranchial musculature demonstrates the neural crest origin of the basibranchials and that Cowralepis was a suction feeder. Finally, the position of the visceral skeleton relative to the neurocranium in placoderms parallels the condition in selachians and osteichthyans, but differs in the elongation of the occiput. The cucullaris fossa of placoderms (interpreted as a site of muscle attachment) is shown to represent, in part, the parabranchial chamber.

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A new petalichthyid placoderm from the Early Devonian of Yunnan, China

Pan

Zhu

Yuanlin

et al. 2015

Comptes Rendus Palevol

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A new genus of placoderm (Arthrodira: ‘Actinolepida’) from the Lower Devonian of Podolia (Ukraine)

Cited by 21 publications

References 6 publications

The earliest phyllolepid (Placodermi, Arthrodira) from the Late Lochkovian (Early Devonian) of Yunnan (South China)

The earliest phyllolepid (Placodermi, Arthrodira) from the Late Lochkovian (Early Devonian) of Yunnan (South China)

The phyllolepid placoderm Cowralepis mclachlani: Insights into the evolution of feeding mechanisms in jawed vertebrates

A new petalichthyid placoderm from the Early Devonian of Yunnan, China

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