Quebecius quebecensis (Whiteaves), a porolepiform crossopterygian (Pisces) from the Late Devonian of Quebec, Canada

Schultze, Hans‐Peter; Arsenault, Marius

doi:10.1139/e87-221

Cited by 14 publications

(8 citation statements)

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“…The suture between the anterior and posterior lateral rostrals is elongate and s-curved, and passes through an elongate opening which probably represents the anterior external nostril. A similar pattern of lateral rostral bones and nostrils is preserved in a specimen of Glyptolepis, UMZC GN1005, and is also present in Qwbecius (Schultze & Arsenault, 1987) and in the holoptychiid described as Puruglyptolepis by Vorobyeva (1987). The posterior lateral rostral corresponds topographically to, and is presumably homologous with, the small 'nariodal' of Holoptychius Uarvik, 1972).…”

Section: Descriptionsupporting

confidence: 53%

A re-examination of sarcopterygian interrelationships, with special reference to the Porolepiformes

Ahlberg

1991

Zoological Journal of the Linnean Society

174

159

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The anatomy of the axial skeleton, median fins and skull of the fossil group Porolepiformes (Osteichthyes: Sarcopterygii) is reviewed, and descriptions by previous authors are modified in the light of new evidence. The first dorsal fin support lacks radials, whereas the posterior radials in the second dorsal fin support form a branching structure. In the snout, porolepiforms primitively have two lateral rostral bones on each side, the posterior one corresponds to the “nariodal” of Jarvik, and the infraorbital canal runs along the suture between this bone and the premaxilla. A cladistic analysis based on 54 characters places the Porolepiformes as sister‐group of a clade Powichlhys + Youngolepis + Diabolepis + Dipnoi. The postcranial skeletons of porolepiforms and early lungfishes are very similar, and the skulls of Powichthys, Toungolepis and Diabolepis can be interpreted as forming a transformation series between porolepiform and dipnoan cranial morphologies. Lungfishes thus appear to be derived from ‘rhipidistian’ ancestors. The porolepiform‐lungfish clade is the sister group of another clade containing tetrapods, panderichthyids, osteolepiforms and rhizodonts. Onychodonts and coelacanths are joing unresolved sister groups of the other sarcopterygians. This cladogram is compared with those of other authors, and possible explanations for the differences are discussed. An outline classification of the Sarcopterygii is proposed.

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Section: Descriptionsupporting

confidence: 53%

A re-examination of sarcopterygian interrelationships, with special reference to the Porolepiformes

Ahlberg

1991

Zoological Journal of the Linnean Society

174

159

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“…; Andrews & Westoll 1970; Cloutier & Schultze 1996; Miller & Brazeau 2007; Downs et al . 2013; Mondéjar‐Fernández & Janvier 2014), Quebecius quebecensis from the Frasnian of Québec (Schultze & Arsenault 1987; Cloutier & Schultze 1996), and Nasogaluakus chorni from the Emsian of Canada (Schultze 2000). Other porolepiforms are known from less complete or disarticulated material.…”

Section: Figmentioning

confidence: 99%

“…Laccognathus from the Givetian-Frasnian of Europe (L. panderi, L. grossi) and North America (L. embryi) (Gross 1941;Vorobyeva , 2006Downs et al 2011), Holoptychius from the Frasnian-Famennian of Europe (H. flemingi, H. giganteus, H. halli, H. ishora, H. nobilissimus, H. radiatus, H. scheii, H. taylori, H. tuberculatus), North (H. bergmanni, H. jarviki) and South America and Asia (Holoptychius sp.) (Andrews & Westoll 1970;Cloutier & Schultze 1996;Miller & Brazeau 2007;Downs et al 2013;Mondéjar-Fernández & Janvier 2014), Quebecius quebecensis from the Frasnian of Québec (Schultze & Arsenault 1987;Cloutier & Schultze 1996), and Nasogaluakus chorni from the Emsian of Canada (Schultze 2000). Other porolepiforms are known from less complete or disarticulated material.…”

Section: Introductionmentioning

confidence: 99%

Redescription of the cranial skeleton of the Early Devonian (Emsian) sarcopterygianDurialepis edentatusOtto (Dipnomorpha, Porolepiformes)

Mondéjar‐Fernández

Friedman

Giles

2020

Papers in Palaeontology

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Porolepiforms represent a clade of Devonian stem lungfishes, divided into the cosminebearing and likely paraphyletic 'Porolepidae' (e.g., Porolepis, Heimenia) and the cosminefree and stratigraphically younger Holoptychiidae (e.g., Holoptychius, Glyptolepis, Laccognathus). Data on the dermoskeleton are available for both groups, but are more limited for 'porolepids'. Here we present new information on the 'porolepid' Durialepis edentatus from the Emsian (Early Devonian) of Germany based on micro-CT scanning. The material comprises an articulated skull of a single three-dimensionally preserved individual. The arrangement of the cheekbones of Durialepis edentatus recalls that of Porolepis brevis, with the occurrence of two subsidiary squamosals. However, the parieto-ethmoidal and postparietal shields are roughly equal in size, a condition similar to that of Glyptolepis groenlandica and intermediate between Porolepis brevis and holoptychiids. A large parasymphysial tooth plate displays five tooth rows with three large tusks in the median row, another intermediate arrangement between the primitive condition of Porolepis sp. (eight rows) and holoptychiids (five or fewer rows). Remarkably among porolepiforms, this dental plate is perfectly symmetrical. Despite the occurrence of cosmine and rhombic scales, the combination of traits displayed in Durialepis deviates from Porolepis in several ways, reflecting features shared with holoptychiids to the exclusion of other 'porolepids'. Durialepis edentatus is thus a key addition to our knowledge of 'porolepid' anatomy. Because Durialepis edentatus preserves much of the cranial and postcranial skeleton in a single individual, it represents a suitable early dipnomorph representative for inclusion in phylogenetic analyses on sarcopterygians and early osteichthyans.

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“…Quebecius Schultze, 1973, first described as an onychodontid, was later re-assessed as a porolepiform (Schultze & Arsenault 1987;Cloutier & Schultze 1996). Onychodontids are mainly represented in the fossil record by many occurrences of isolated teeth in Devonian and Carboniferous strata (Schultze 1973).…”

Section: A D D I T I O N a L M A T E R I A L : Various Isolated Teethmentioning

confidence: 99%

New osteichthyans (bony fishes) from the Devonian of Central Australia

Young

Schultze

2005

Foss. Rec.

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Osteichthyan remains described from two localities in Central Australia (Mount Winter, Amadeus Basin, and southern Toomba Range, Georgina Basin) include the dipnoan Amadeodipterus kencampbelli n. gen., n. sp., the osteolepidid Muranjilepis winterensis n. gen., n. sp., and the onychodontid Luckeus abudda n. gen., n. sp., as well as indeterminate holoptychiid scales, osteolepidid scales of a new type from the Georgina Basin locality, and indeterminate onychodontid remains from both localities. Amadeodipterus n. gen. is a short-headed dipterid dipnoan with bones A and H enclosed into the skull roof; Muranjilepis n. gen. is a small form with short postparietal and parietoethmoidal shields, large orbits, and large pores of the sensory line system. It is closest to Thursius, and some Chinese osteolepidid material. Luckeus n. gen. is based on an onychodontid lower jaw with Meckel’s cartilage separately ossified perichondrally from the dentary and infradentary, and carrying the parasymphysial tooth whorl. Different osteichthyan taxa at the two localities indicate a difference in age and/or palaeoenvironment within the Early-Middle Devonian. Knochenfischreste aus zwei Fundorten Zentralaustraliens (Mount Winter, Amadeus Becken und südlicher Toomba Rücken, Georgina Becken) umfassen den Lungenfisch Amadeodipterus kencampbelli n. gen., n. sp., den osteolepididen Sarcopterygier Muranjilepiswinterensis n. gen., n. sp., und den onychodontiden Sarcopterygier Luckeus abudda n. gen., n. sp., sowie unbestimmte holoptychiide und osteolepidide Schuppen eines neuen Typs aus dem Fundort im Georgina Becken und unbestimmte onychodontide Reste von beiden Fundorten. Amadeodipterus n. gen. ist ein kurz-schädeliger Lungenfisch, bei dem die Knochen A und H in das Schädeldach miteingeschlossen sind. Bei Muranjilepis n. gen. handelt es sich um einen kleinen Osteolepididen mit kurzem Postparietal- und Parietoethmoidal-Schild, großen Augenhöhlen und großen Poren des Sinneskanalsystems; er ist am nächsten mit Thursius und einigen chinesischen Osteolepididen verwandt. Ein unbestimmter onychodontider Unterkiefer zeigt ein wahrscheinlich primitives Merkmal in der perichondralen Verknöcherung des Meckelschen Knorpels getrennt von Dentale und Infradentale, der die Unterlage der parasymphysialen Zahnspirale bildet. Verschiedene Knochenfischtaxa treten an den beiden Lokalitäten auf; das deutet auf unterschiedliches Alter und/oder Palaeoenviroment an der Unter-Mitteldevongrenze zwischen beiden Lokalitäten hin. doi:<a href="http://dx.doi.org/10.1002/mmng.200410002" target="_blank">10.1002/mmng.200410002</a>

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Quebecius quebecensis (Whiteaves), a porolepiform crossopterygian (Pisces) from the Late Devonian of Quebec, Canada

Cited by 14 publications

References 0 publications

A re-examination of sarcopterygian interrelationships, with special reference to the Porolepiformes

A re-examination of sarcopterygian interrelationships, with special reference to the Porolepiformes

Redescription of the cranial skeleton of the Early Devonian (Emsian) sarcopterygianDurialepis edentatusOtto (Dipnomorpha, Porolepiformes)

New osteichthyans (bony fishes) from the Devonian of Central Australia

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