A new species of the Devonian actinopterygian<i>Moythomasia</i>from Bergisch Gladbach, Germany, and fresh observations on<i>M. durgaringa</i>from the Gogo Formation of Western Australia

Choo, Brian

doi:10.1080/02724634.2015.952817

Cited by 20 publications

(34 citation statements)

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“…; Swartz ). Until recently, Mimipiscis toombsi and Moythomasia durgaringa represented the only Devonian actinopterygian taxa in which both the dermal and endochondral anatomy was thoroughly described (Gardiner ; Giles & Friedman 2014; Choo ), with the majority of contemporary forms being primarily known from flattened dermal remains. As a consequence, several earlier studies either omitted many fossil taxa (Gardiner et al .…”

Section: Discussionmentioning

confidence: 99%

“…The ethmoidal commissure (ethc; Fig. D) is clearly visible as a raised furrow on the medial surface as in Mimipiscis and Gogosardina (Choo ), but unlike Moythomasia (Choo ). The dentition is typical for Devonian actinopterygians (Gardiner ), consisting of conical teeth on the biting margins of the premaxillae, maxilla and dentary which are situated mesial to an outer row of smaller marginal teeth.…”

Section: Descriptionmentioning

confidence: 97%

“…The large size of these openings is unlike the minute spiracules typically found in other Devonian actinopterygians (Gardiner ; Long et al . 2008; Choo , ) and more akin to those of some early tetrapodomorphs, notably Gogonasus and elpistostegalians (Long et al . ).…”

Section: Descriptionmentioning

confidence: 99%

“…The first detailed study of the actinopterygians from the Gogo Formation identified two species (Gardiner & Bartram ): Moythomasia durgaringa (Gardiner ; Choo ) and Mimipiscis toombsi (Gardiner ; revised Choo ). These taxa, especially M. toombsi , represent the most thoroughly described Palaeozoic actinopterygians and have featured in numerous studies into early osteichthyan anatomy and phylogeny (Long ; Gardiner & Schaeffer ; Schultze & Cumbaa ; Cloutier & Arratia ; Friedman & Blom ; Long et al .…”

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A new actinopterygian from the Late Devonian Gogo Formation, Western Australia

Choo

Lü

Giles

et al. 2018

Papers in Palaeontology

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The study of early actinopterygians (ray‐finned fishes) from the Devonian has been hampered by imperfect preservation in the majority of taxa. The Late Devonian (early Frasnian) Gogo Formation of north‐western Western Australia is notable in producing complete fossil actinopterygians with exceptional three‐dimensional preservation of both the dermal and endoskeletal anatomy. Four taxa have been described and have proved invaluable in understanding the anatomy of early representatives of this clade. Here, we present a fifth Gogo taxon, based on a single exceptionally preserved specimen and representing a new genus and species of early ray‐finned fish. The neurocranium was CT scanned, permitting a detailed examination of the endocast. The new taxon possesses unusual features including a greatly enlarged spiracular opening and extensive spinose ornamentation on the dermal skull bones, median ridge scutes and lepidotrichia. The endocast displays a mosaic of characters, some of which are similar to Mimipiscis and non‐actinopterygian outgroups, while other features are more akin to Raynerius from the Late Devonian of France as well as several stratigraphically younger taxa. A phylogenetic analysis resolves the new form as sister taxon to fishes from the Late Devonian of the northern hemisphere and all post‐Devonian actinopterygians, confirming that the assemblage of fossil ray fins from the Gogo Formation is part of the wider Devonian actinopterygian radiation.

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Section: Discussionmentioning

confidence: 99%

Section: Descriptionmentioning

confidence: 97%

Section: Descriptionmentioning

confidence: 99%

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A new actinopterygian from the Late Devonian Gogo Formation, Western Australia

Choo

Lü

Giles

et al. 2018

Papers in Palaeontology

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“…Wide variation in the ridges of cranial bones (Choo et al . ; Choo , ) means that identification of fragmented cranial bones is problematic. Likewise, the high variability of scale morphologies in early Actinopterygii means that it is difficult to say whether the Minto Formation scales represent one or more species (Choo ).…”

Section: Systematic Palaeontologymentioning

confidence: 99%

Fish and tetrapod communities across a marine to brackish salinity gradient in the Pennsylvanian (early Moscovian) Minto Formation of New Brunswick, Canada, and their palaeoecological and palaeogeographical implications

et al. 2016

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42The cosmopolitan biogeography of many fish genera strongly indicates marine-based 43 dispersal, while strontium isotopic data suggest these same fish were exposed, at times, to ). An intriguing characteristic of this episode was the apparent widespread adoption of 68 a euryhaline habit amongst organisms as diverse as microconchids, ostracodes, xiphosurans 69 and fish (Anderson and Shuster 2003; Carpenter et al. 2011; Bennett et al. 2012; Gierlowski-70 Kordesch and Cassle 2015). Euryhaline animals are relatively rare in modern ecosystems 71 (Edwards and Marshall 2013; McCormick et al. 2013), and their dominance in Carboniferous 72 times suggests marine communities converged on similar osmoregulatory strategies in order 73 to utilise empty non-marine coastal ecospace for feeding and breeding (Williams et al. 2006; 74 Carpenter et al. 2014), prior to the widespread colonisation of freshwater tracts further inland. 75The mid-Carboniferous diversification event coincided with a sharp growth of 76Gondwanan ice sheets and the onset of significant Milankovitch-driven glacio-eustatic 86Much recent attention has been given to the apparent dominance of a euryhaline mode 87 of life amongst mid-Carboniferous fish communities (Schultze 2009; Carpenter et al. 2011 Carpenter et al. , 88 2014Carpenter et al. , 2015. However, consensus regarding ecology is currently lacking, with some 89 researchers arguing on palaeogeographic, sedimentological and geochemical grounds that fish 90 taxa, especially xenacanthid sharks (Masson and Rust 1984), may have been obligate 91 freshwater organisms (Śtamberg and Zajíc 2008;Fischer et al. 2011 Fischer et al. , 2013 Montañez and 92 Cecil 2013). In this paper, we describe a new fish fauna from the Carboniferous 93 (Pennsylvanian) of New Brunswick, Canada (Fig. 1A), and demonstrate -based on 94 independent indicators of palaeo-salinity -that fish taxa existed across a brackish to marine 95 gradient, and that communities must therefore have been euryhaline. We discuss how these 96 new findings improve understanding of Carboniferous fish ecology and the mid- 97Carboniferous diversification of non-marine ecosystems in particular. The fish fossils reported here were obtained from opencast mine sites (now reclaimed) within 102 the Minto Coalfield, Queens County, New Brunswick, Canada (Fig. 1A-C 98 +REVISE FOR TETRAPOD STORY 123Extensive borehole arrays indicate that this basal unconformity is marked by a major silcrete 124 paleosol, up to 9 m thick in places (Sullivan 1981; St Peter 2000), which mantles the 125 basement complex and indicates seasonally-dry climate weathering over the preceding (Fig. 3A), implying that the basin deepened towards the 137 southwest, and sediment progressively onlapped towards the northeast; and (2) NE-SW- Coal, fine towards the southwest (Fig. 3B) and suggest sediment transport in that direction. 140We note, however, that this inferred palaeoflow direction opposes regional patterns of Geological Surveys Branch, Fredericton (Fig. 4A). 154The low...

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Actinopterygii (Bony Fish)

Amorim¹

2019

Encyclopedia of Animal Cognition and Behavior

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A new species of the Devonian actinopterygianMoythomasiafrom Bergisch Gladbach, Germany, and fresh observations onM. durgaringafrom the Gogo Formation of Western Australia

Cited by 20 publications

References 32 publications

A new actinopterygian from the Late Devonian Gogo Formation, Western Australia

A new actinopterygian from the Late Devonian Gogo Formation, Western Australia

Fish and tetrapod communities across a marine to brackish salinity gradient in the Pennsylvanian (early Moscovian) Minto Formation of New Brunswick, Canada, and their palaeoecological and palaeogeographical implications

Actinopterygii (Bony Fish)

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