Large Tristichopteridae (Sarcopterygii, Tetrapodomorpha) from the Late Famennian Evieux Formation of Belgium

Clément, Gérard

doi:10.1111/1475-4983.00250

Cited by 21 publications

(45 citation statements)

References 13 publications

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“…Even assuming the ossification center was closer to the front of the postrostral in Edenopteron , it must have been more elongate than in Eusthenodon . This seems to be the case also in Langlieria Clément et al, 2009 [30] from Belgium, with a much larger median postrostral than the associated Eusthenodon ([37]: figs. 3B, T).…”

Section: Description Of Edenopteron Keithcrooki Gen Et Sp Novsupporting

confidence: 61%

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A Gigantic Sarcopterygian (Tetrapodomorph Lobe-Finned Fish) from the Upper Devonian of Gondwana (Eden, New South Wales, Australia)

et al. 2013

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Edenopteron keithcrooki gen. et sp. nov. is described from the Famennian Worange Point Formation; the holotype is amongst the largest tristichopterids and sarcopterygians documented by semi-articulated remains from the Devonian Period. The new taxon has dentary fangs and premaxillary tusks, features assumed to be derived for large Northern Hemisphere tristichopterids (Eusthenodon, Hyneria, Langlieria). It resembles Eusthenodon in ornament, but is distinguished by longer proportions of the parietal compared to the post-parietal shield, and numerous differences in shape and proportions of other bones. Several characters (accessory vomers in the palate, submandibulars overlapping ventral jaw margin, scales ornamented with widely-spaced deep grooves) are recorded only in tristichopterids from East Gondwana (Australia-Antarctica). On this evidence Edenopteron gen. nov. is placed in an endemic Gondwanan subfamily Mandageriinae within the Tristichopteridae; it differs from the nominal genotype Mandageria in its larger size, less pointed skull, shape of the orbits and other skull characters. The hypothesis that tristichopterids evolved in Laurussia and later dispersed into Gondwana, and a derived subgroup of large Late Devonian genera dispersed from Gondwana, is inconsistent with the evidence of the new taxon. Using oldest fossil and most primitive clade criteria the most recent phylogeny resolves South China and Gondwana as areas of origin for all tetrapodomorphs. The immediate outgroup to tristichopterids remains unresolved – either Spodichthys from Greenland as recently proposed, or Marsdenichthys from Gondwana, earlier suggested to be the sister group to all tristichopterids. Both taxa combine two characters that do not co-occur in other tetrapodomorphs (extratemporal bone in the skull; non-cosmoid round scales with an internal boss). Recently both ‘primitive’ and ‘derived’ tristichopterids have been discovered in the late Middle Devonian of both hemispheres, implying extensive ghost lineages within the group. Resolving their phylogeny and biogeography will depend on a comprehensive new phylogenetic analysis.

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Section: Description Of Edenopteron Keithcrooki Gen Et Sp Novsupporting

confidence: 61%

“…The subopercular is a similar size to one from Belgium that has been referred to the type species Eusthenodon waengsjoei ([37]: fig. 2B).…”

Section: Description Of Edenopteron Keithcrooki Gen Et Sp Novmentioning

confidence: 85%

A Gigantic Sarcopterygian (Tetrapodomorph Lobe-Finned Fish) from the Upper Devonian of Gondwana (Eden, New South Wales, Australia)

et al. 2013

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“…The dermopalatine exhibits one large set of fangs, and several small labial teeth towards the anterior of the bone. This is in contrast to Eusthenodon and Mandageria, which lack marginal teeth anterior to the dermopalatine fang (Clément, 2002). The ectopterygoid displays one large set of fangs anteriorly, and possibly a second smaller set approaching the posterior.…”

Section: Description: New Materials Of Marsdenichthysmentioning

confidence: 82%

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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“…However, evaluating the distribution of the posteroventral lower jaw concavity seen in NMV P198470 throughout the Tristichopteridae requires caution, because the area is either not well preserved or described as the Madageriidae (e.g. Young et al, 1992;Ahlberg and Johanson, 1997;Johanson and Ahlberg, 1997) and Langlieria (Clément, 2002); and appears absent from Eusthenodon wängsjöi (Jarvik, 1952), Jarvikina (Vorobyeva, 1962), the European species of Eusthenopteron (e.g. Vorobyeva, 1962;Zupiņš, 2008) and the basal Tristichopterus (Traquair, 1875).…”

Section: Discussionmentioning

confidence: 99%

“…In the cladistical analysis of Clément et al (2009), Eusthenodon and Langlieria are grouped in an apical clade with Mandageria and Cabonnichthys. However, the former two taxa are described as having eusthenodont teeth (Schultze, 1970;Clément, 2002), while polyplocodont teeth are recorded from the later Johanson and Ahlberg, 1997). It would be of great interest to determine the tooth morphology of the Eden tristichopterid to compare with the Northern Hemisphere specimens of Eusthenodon and the tristichopterids from Canowindra, to ascertain phylogenetic information.…”

Section: Discussionmentioning

confidence: 99%

Upper Devonian osteichthyan remains from the Genoa River, Victoria, Australia

Holland¹

2010

MMV

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Holland, T. 2010. Upper Devonian osteichthyan remains from the Genoa River, Victoria, Australia. Memoirs of Museum Victoria 67: 35-44.The Genoa River Trackway site in the Upper Devonian Combyingbar Formation represents one of the earliest records of tetrapods (land vertebrates) from Australia. However, the osteichthyan assemblage from the site is poorly known compared to other Devonian tetrapod localities. New information from a tetrapodomorph fish lower jaw possibly indicates the first record of a tristichopterid from the Genoa River Beds. The specimen shares a posteroventral embayment in the profile of lower jaw with Eusthenopteron foordi, Platycephalichthys bischoffi, and Moroccan tristichopterid material, as well an isolated specimen of the 'osteolepidid' Gyroptychius. Polyplocodont and dendrodont teeth are also described from the Genoa River, with the latter indicating the presence of a large, porolepiform taxon. The antiarch placoderm Remigolepis represents the most abundant fossil fish taxon recorded from the Genoa River. The possible presence of phyllolepid placoderm material may support previous suggestions of a pre-Famennian age for the Genoa River Beds.

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Large Tristichopteridae (Sarcopterygii, Tetrapodomorpha) from the Late Famennian Evieux Formation of Belgium

Cited by 21 publications

References 13 publications

A Gigantic Sarcopterygian (Tetrapodomorph Lobe-Finned Fish) from the Upper Devonian of Gondwana (Eden, New South Wales, Australia)

A Gigantic Sarcopterygian (Tetrapodomorph Lobe-Finned Fish) from the Upper Devonian of Gondwana (Eden, New South Wales, Australia)

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

Upper Devonian osteichthyan remains from the Genoa River, Victoria, Australia

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