Fish assemblages in the Tournaisian-Viséan environments of the East European Platform

Lebedev, Oleg A.

doi:10.1144/gsl.sp.1996.107.01.28

Cited by 21 publications

(26 citation statements)

References 12 publications

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“…However, the phylogenetic relationship of Rhiz odopsis is poorly understood amongst tetrapodomorph fishes. The only other members previously assigned to the Rhizodopsidae include Callistiopterus clappi Romer, 1942, a taxon described from a fragmentary juvenile specimen "whose adult form is hypothetical" (Andrews and Westoll, 1970) and Taeniolepis trautseholdi Chabakov, 1927, which is known from isolated teeth and scales (Lebedev, 1996). There has never been a detailed modern systematic description and diagnosis published for Rhiz odopsis, although partially complete skull material (e.g., Traquair, 1881;Säve-Söderbergh, 1936) and complete postcranial skeletons, including pectoral fin elements (e.g., Andrews and Westoll, 1970), are known.…”

Section: Discussionmentioning

confidence: 99%

New information on the enigmatic tetrapodomorph fishMarsdenichthys longioccipitus(Long, 1985)

Holland

Long

Snitting

2010

Journal of Vertebrate Paleontology

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ABSTRACT-The tetrapodomorph fish Marsdenichthys longioccipitus from the Givetian-Frasnian of Mt. Howitt, Victoria, Australia, occupies an uncertain phylogenetic position. Marsdenichthys has been linked to the base of the Tristichopteridae, as well as to the poorly known Northern Hemisphere form Rhiz odopsis, based on the presence of rounded scales bearing a median boss on the internal surface. However, its affinities to these taxa are ambiguous, due to the incomplete preservation of the two Marsdenichthys specimens initially described. For the first time, we present significant information regarding the cheek and palate of Marsdenichthys, based on the descriptions of two new specimens from Mt. Howitt. New autapomorphies for Marsdenichthys are proposed, including the presence of a bar-like maxilla being approximately equal in depth to the dentary, and a rectangular anterior termination of the lacrimal. Several plesiomorphic features are described from the palate, including rounded vomer morphology lacking a posterior process, a relatively short, broad parasphenoid, and a dermopalatine approximately equal in length to the ectopterygoid. No synapomorphies are shared between Marsdenichthys and tristichopterids. Scale morphology is redescribed, and shown to exhibit concentric rings on the external surface, as in Rhiz odopsis. However, differences in skull morphology, such as the lack of an external opening for the pineal foramen in Rhiz odopsis, suggest that this scale morphology may have evolved independently.

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Section: Discussionmentioning

confidence: 99%

New information on the enigmatic tetrapodomorph fishMarsdenichthys longioccipitus(Long, 1985)

Holland

Long

Snitting

2010

Journal of Vertebrate Paleontology

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“…The other, larger complete specimens (Fig. 9E–H) are more oval in outline, similar to Psephodus dentatus Romanovsky, 1864 illustrated by Lebedev (1996, fig. 14a–b), although P. dentatus has upper tubular dentine overhanging the base.…”

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confidence: 59%

“…Remarks. The Cromhall specimens are not identical to those described by Lebedev (1996, p. 392, fig. 5) as S. altonensis PIN 4359/76 and PIN 4359/73.…”

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confidence: 60%

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A carboniferous chondrichthyan assemblage from residues within a Triassic karst system at Cromhall quarry, Gloucestershire, England

Behan¹,

Walken²,

Cuny³

2012

Palaeontology

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Abstract. Sixteen different Lower Carboniferous (Tournaisian Courceyan to Chadian age, Mississippian) chondrichthyan teeth types have been extracted from Triassic erosional/aeolian fills in shallow karst systems found in the limestone quarry at Cromhall, Gloucestershire, England. These Carboniferous teeth have been found within a much larger assemblage of disarticulated bones and teeth belonging to small late Triassic terrestrial reptiles, for which Cromhall quarry is famous. The Carboniferous teeth are derived fossils, released during subaerial dissolution of the surrounding limestones. Owing to low specimen numbers and uncertainty of intraspecific character, 10 types of teeth are left in open nomenclature, although it is likely they represent new taxa. They belong to Jalodus, Ctenacanthiformes, Protacrodus, Orodus, Chomatodus, Petalodontidae, Euchondrocephali?, Helodus and Psephodus. A new genus and species, Cromhallia parvunda, of indeterminate phylogenetic relationships, is also erected. The assemblage includes also an identified suite comprising Thrinacodus ferox, Bransonella cf. nebraskensis and Stethacanthus cf. altonensis. The identification of all fish teeth found in the Cromhall assemblages as derived fossils from the Carboniferous removes any ambiguity regarding the fully terrestrial nature of the late Triassic fauna preserved in the residue‐bearing karst systems.

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“…The aboral surface of the base is much smaller than that of the crown, but its edges follow the outline of the lat ter, especially in the labial margin and part of the lateral side, where the tooth plate edge is well preserved. The tooth plate is almost symmetrical and does not show a characteristic oblique twist, which is present for exam ple in Psephodus dentatus (Romanowsky, 1864) from the Tournaisian of Central Russia (Lebedev, 1996). The bilateral nature of the specimen on Pl.…”

Section: Kanodus Robustusmentioning

confidence: 91%

Permian chondrichthyans of the Kanin Peninsula, Russia

Ivanov

Lebedev

2014

Paleontol. J.

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Chondrichthyan fish remains reported from the Permian (Kazanian) deposits of the Chiosha Bay, and the lower course of the Nadtey River of the Kanin Peninsula (Nenets Autonomous District, Arkhangelsk Region, Russia) include dental elements and scales belonging to Stethacanthus cf. S. altonensis (St. John et Worthen, 1875), Symmoriiformes gen. indet., "Ctenacanthus" sp. and "Lissodus" sp., Euselachii gen. indet., Adamantina benedictae Bendix Almgreen, 1993 and Kanodus robustus sp. nov. The latter genus is assigned to the previously monotypic family Psephodontidae. The record of Stethacanthus in the Middle Permian of Russia is its youngest occurrence worldwide, whilst the occurrence of Adamantina benedictae in the Middle Permian of the Kanin Peninsula is older than the Greenland record.

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Fish assemblages in the Tournaisian-Viséan environments of the East European Platform

Abstract: New fish material, including microremains from the Tournaisian-Vis6an

Cited by 21 publications

References 12 publications

New information on the enigmatic tetrapodomorph fishMarsdenichthys longioccipitus(Long, 1985)

New information on the enigmatic tetrapodomorph fishMarsdenichthys longioccipitus(Long, 1985)

A carboniferous chondrichthyan assemblage from residues within a Triassic karst system at Cromhall quarry, Gloucestershire, England

Permian chondrichthyans of the Kanin Peninsula, Russia

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