Morphology, phylogeny and taxonomy of osteolepiform fish

Borgen, Ulf J.; Nakrem, Hans Arne

doi:10.1002/9781119286448

Cited by 5 publications

(14 citation statements)

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“…The dorsal and mesial planes of the prearticular form a right angle. This condition contrasts with that known in osteolepiforms (Borgen & Nakrem 2017), in which the prearticular plate is more or less vertical and flat, but agrees with that in Panderichthys. The suture between the anterior end of the prearticular and the posterior process of the splenial is hardly visible and marked only as an area of zigzag striations (Pra-Sp).…”

Section: Methodssupporting

confidence: 63%

“…In the finned sarcopterygians this feature is variable. A toothed anterior coronoid process is observed in numerous ‘osteolepidids' and Lamprotolepis , but not in Megalichthys , tristichopterids and elpistostegalians (Vorobyeva 1977; Borgen & Nakrem 2017); thus, it cannot be used to unequivocally define limbed tetrapods.…”

Section: Discussionmentioning

confidence: 99%

“…os). It is possible that the suture is widened due to its combination with the horizontal part of the mandibular pit-line, as discussed by Borgen & Nakrem (2017). The partly preserved postsplenial/ angular suture groove ( psp-ang) is placed at the broken end of the jaw fragment.…”

Section: Methodsmentioning

confidence: 99%

“…No sutures are marked on the external surface of the bone. This twofold structure of the postfrontal might be a trace of an ancestral two- or even threefold state and further incomplete fusion of the supraorbital series of bones (Jarvik 1944; Borgen & Nakrem 2017).…”

Section: Systematic Palaeontologymentioning

confidence: 99%

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New tetrapodomorph vertebrates from the Yam-Tesovo locality (Amata Regional Stage, Middle–Upper Devonian) of Leningrad Region, northwestern Russia

Lebedev¹,

Clément²

2018

Earth and Environmental Science Transactions of the Royal Socie

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Each piece of data is valuable for unearthing the earliest history of tetrapod origin. Despite frequently incomplete preservation, each skeletal element provides important information on the morphology, phylogeny and faunistic diversity of early tetrapodomorphs. We describe here new and earlier collected material from the fossil vertebrate site Yam-Tesovo on the Oredezh River (Leningrad Region, northwestern Russia) in the deposits of the Yam-Tesovo Formation within the Amata Regional Stage (?lowermost Frasnian, Upper Devonian). Upon similarity of their dermal ornamentation, two mandibular fragments are suggested to belong to the new tetrapodomorph taxon Rubrognathuskuleshovi n. gen. et sp. This species demonstrates a general ‘elpistostegalian' morphological pattern with some early tetrapod characters. The new taxon is characterised by an almost closed intercoronoid fossa, a prearticular that is strongly convex in section and bearing small teeth along its dorsal margin, low vertical coronoid laminae and coronoid fangs that enter the coronoid tooth row. The mandibular canal runs partly in open groove or opens to the surface by a row of large pores. The dermal ornament consists of a network of small ridges forming tubercles in the nodes. The postfrontal assigned to Tetrapodomorpha shows a ‘tetrapod-like' pits-and-ridges sculpturing and a supraorbital ridge characteristic of early tetrapods as well as ‘elpistostegalians'. Its long posterolateral bone margin demonstrates a lateral projection similar to that in Tiktaalik and unknown in other ‘elpistostegalians' and early tetrapods. An unusually flattened vomer is doubtfully related to the tetrapodomorph genus Livoniana Ahlberg, Lukševičs & Mark-Kurik, 2000, based upon characteristic multiple tooth rows. Teeth in rows decrease labially and show no clearly enlarged fang pairs. New finds of the last two decades present the earliest records of some tetrapod characters in non-limbed tetrapodomorphs. This challenges previous hypotheses on the origin of tetrapods.

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Section: Methodssupporting

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Systematic Palaeontologymentioning

confidence: 99%

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New tetrapodomorph vertebrates from the Yam-Tesovo locality (Amata Regional Stage, Middle–Upper Devonian) of Leningrad Region, northwestern Russia

Lebedev¹,

Clément²

2018

Earth and Environmental Science Transactions of the Royal Socie

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“…2007). In Euramerica, the megalichthyinids, as represented by Megalichthys , Ectosteorhachis (Thomson 1964) and Palatinichthys (Witzmann & Schoch 2012), plus Askerichthys (Borgen & Nakrem 2017), are only known from post-Devonian deposits.…”

Section: Phylogenetic and Biogeographic Implications Of East Gondwanamentioning

confidence: 99%

New insights into the origins and radiation of the mid-Palaeozoic Gondwanan stem tetrapods

Long¹,

Clement²,

Choo³

2018

Earth and Environmental Science Transactions of the Royal Socie

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The earliest tetrapodomorph fishes appear in Chinese deposits of Early Devonian age, and by the Middle Devonian they were widespread globally. Evidence for the earliest digitated tetrapods comes from largely uncontested Middle Devonian trackways and Late Devonian body fossils. The East Gondwana Provence (Australasia, Antarctica) fills vital gaps in the phylogenetic and biogeographic history of the tetrapods, with the Gondwanan clade Canowindididae exhibiting a high degree of endemism within the early part of the stem tetrapod radiation. New anatomical details of Koharalepis, from the Middle Devonian Aztec Siltstone of Antarctica, are elucidated from synchrotron scan data. These include the position of the orbit, the condition of the hyomandibular, the shape of the palate and arrangement of the vomerine fangs. Biogeographical and phylogenetic models of stem tetrapod origins and radiations are discussed.

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Tristichopterids (Sarcopterygii, Tetrapodomorpha) from the Upper Devonian tetrapod-bearing locality of Strud (Belgium, upper Famennian), with phylogenetic and paleobiogeographic considerations

Olive

Leroy

Daeschler

et al. 2020

Journal of Vertebrate Paleontology

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We describe new material of the tristichopterids cf. Langlieria socqueti and cf. Eusthenodon wangsjoi and other unassignable tetrapodomorph remains from the late Famennian locality of Strud, Belgium. Because of recent improvements in our tristichopterid knowledge, a new phylogenetic analysis is presented in addition to a paleobiogeographic analysis using the Bayesian Binary MCMC statistical method. A clade formed by (Langlieria socqueti ((Edenopteron keithcrooki + Hyneria lindae) (Heddleichthys dalgleisiensis (Cabonnichthys burnsi (Mandageria fairfaxi + Eusthenodon wangsjoi))))) represents the most highly-nested tristichopterids and the biogeographic analysis supports a Western European origin for it. The biogeographic analysis additionally proposes several tristichopterid dispersal events between Euramerica and Gondwana from the Givetian to Famennian, providing a more complex scenario than the one proposed by the Great Devonian Interchange.

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Morphology, phylogeny and taxonomy of osteolepiform fish

Cited by 5 publications

References 0 publications

New tetrapodomorph vertebrates from the Yam-Tesovo locality (Amata Regional Stage, Middle–Upper Devonian) of Leningrad Region, northwestern Russia

New tetrapodomorph vertebrates from the Yam-Tesovo locality (Amata Regional Stage, Middle–Upper Devonian) of Leningrad Region, northwestern Russia

New insights into the origins and radiation of the mid-Palaeozoic Gondwanan stem tetrapods

Tristichopterids (Sarcopterygii, Tetrapodomorpha) from the Upper Devonian tetrapod-bearing locality of Strud (Belgium, upper Famennian), with phylogenetic and paleobiogeographic considerations

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