A new semionotiform actinopterygian fish from the Mesozoic of Spain and its phylogenetic implications

Bermúdez-Rochas, David D.; Poyato-Ariza, Francisco José

doi:10.1080/14772019.2014.881928

Cited by 21 publications

(21 citation statements)

References 15 publications

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“…Most of all, however, our results confirm the sister-group relationship of Dapedium and the Ginglymodi also postulated recently by Berm udez-Rochas & Poyato-Ariza (2014). This is all the more important as the same results were reached independently in different ways.…”

Section: Resultssupporting

confidence: 94%

Redescription ofDapedium pholidotum(Agassiz, 1832) (Actinopterygii, Neopterygii) from the Lower Jurassic Posidonia Shale, with comments on the phylogenetic position ofDapediumLeach, 1822

Thies

Waschkewitz²

2015

Journal of Systematic Palaeontology

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Dapedium pholidotum (Agassiz, 1832) (Actinopterygii, Neopterygii) is redescribed based on new material from the Posidonia Shale (Early Jurassic: Early Toarcian) of Germany. Dapediiformes ord. nov. is introduced for Dapedium Leach, 1822 and other deep-bodied Mesozoic neopterygians. The species diagnosis of D. pholidotum is amended. Comparison with D. stollorum Thies & Hauff, 2011 and D. caelatum Quenstedt, 1858, also from the Lower Jurassic Posidonia Shale, shows that D. pholidotum is unique in having: (1) a length/height ratio of the operculum of c. 0.73, whereas in D. stollorum and D. caelatum this value reaches only c. 0.58; (2) a length/width ratio of the gular plate of c. 1.6, whereas in D. stollorum and D. caelatum this value is 1.3; (3) 27 or more caudal fin lepidotrichia, whereas in D. stollorum and D. caelatum there are 24 and 25 lepidotrichia, respectively; (4) at least 26 dorsal fin lepidotrichia, whereas D. stollorum and D. caelatum possess only 24 dorsal fin lepidotrichia each; and (5) a length/height ratio of the flank scales immediately behind the operculum of 0.37, whereas in D. stollorum and D. caelatum this ratio ranges around 0.31 and 0.5, respectively. A cladistic analysis based on modification of a previously published taxonÀcharacter matrix shows that Dapedium is the sister group of the ginglymodian fishes [Semionotiformes C Lepisosteiformes]. The generic diagnosis of Dapedium Leach, 1822 is amended.

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Section: Resultssupporting

confidence: 94%

Redescription ofDapedium pholidotum(Agassiz, 1832) (Actinopterygii, Neopterygii) from the Lower Jurassic Posidonia Shale, with comments on the phylogenetic position ofDapediumLeach, 1822

Thies

Waschkewitz²

2015

Journal of Systematic Palaeontology

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“…While dapediids have been recovered as total group holosteans before, they are more typically resolved as the sister group to ginglymodians [36,37]. A stem holostean position was recovered by López-Arbarello & Sferco [10] on the basis of two homoplastic characters (four or more supraorbitals and a presupracleithrum), neither of which are optimized as supporting this relationship in the current analysis.…”

Section: Discussionmentioning

confidence: 88%

A giant dapediid from the Late Triassic of Switzerland and insights into neopterygian phylogeny

Latimer

Giles

2018

R. Soc. open sci.

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A new Triassic neopterygian is described on the basis of a large three-dimensional neurocranium from the Rhaetian (Late Triassic) of the Kössen Formation (Schesaplana, Grisons, Switzerland). CT scanning reveals neurocranial features similar to Dapedium, suggesting that this new genus, Scopulipiscis saxciput gen. et sp. nov., was deep-bodied and potentially durophagous, although no associated dental material is known. An expanded phylogenetic analysis of actinopterygians resolves Dapediidae as a clade (inclusive of Tetragonolepis), although fails to recover any characters supporting the monophyly of the genus Dapedium. Dapediids are resolved as stem holosteans, filling a conspicuous gap in early neopterygian relationships. Pycnodonts, previously suggested as either stem teleosts or the sister group to dapediids, are resolved as a clade on the neopterygian stem. Similarities between the new taxon described here and Dapedium provide insights into morphological disparity within early members of the group—suggesting that the ecological expansion of dapediids originated prior to the End-Triassic extinction—as well as contributing to a growing understanding of endocranial anatomy in Palaeozoic and Early Mesozoic actinopterygians.

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“…The data matrix is built upon [ 20 ], which used many of the characters from López-Arbarello [ 32 ] for ginglymodian fishes. Two other studies [ 15 , 33 ] have also used either the whole matrix or a subsample of the matrix from [ 32 ] for their respective analyses of holostean fishes. Two additional characters (the presence of a suprapreopercular bone, and the number of infraorbitals anterior to the orbit, characters 96 and 97 in this matrix, respectively) from [ 33 ] were added to the matrix because of their use in further delineating ginglymodian relationships.…”

Section: Methodsmentioning

confidence: 99%

Redescription and Phylogenetic Placement of †Hemicalypterus weiri Schaeffer, 1967 (Actinopterygii, Neopterygii) from the Triassic Chinle Formation, Southwestern United States: New Insights into Morphology, Ecological Niche, and Phylogeny

Gibson

2016

PLoS ONE

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The actinopterygian fish †Hemicalypterus weiri Schaeffer, 1967 is herein redescribed and rediagnosed based on new information collected from reexamination of museum specimens as well as examination of recently collected specimens from the Upper Triassic Chinle Formation of San Juan County, Utah, United States. †Hemicalypterus is distinguishable by its deep, disc-shaped compressed body; ganoid-scaled anterior half and scaleless posterior half; spinose, prominent dorsal and ventral ridge scales anterior to dorsal and anal fins; hem-like dorsal and anal fins with rounded distal margins; small mouth gape; and specialized, multicuspid dentition. This type of dentition, when observed in extant fishes, is often associated with herbivory, and †Hemicalypterus represents the oldest known ray-finned fish to have possibly exploited an herbivorous trophic feeding niche. A phylogenetic analysis infers a placement of †Hemicalypterus within †Dapediiformes, with †Dapediiformes being recovered as sister to Ginglymodi within holostean actinopterygians.

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A new semionotiform actinopterygian fish from the Mesozoic of Spain and its phylogenetic implications

Cited by 21 publications

References 15 publications

Redescription ofDapedium pholidotum(Agassiz, 1832) (Actinopterygii, Neopterygii) from the Lower Jurassic Posidonia Shale, with comments on the phylogenetic position ofDapediumLeach, 1822

Redescription ofDapedium pholidotum(Agassiz, 1832) (Actinopterygii, Neopterygii) from the Lower Jurassic Posidonia Shale, with comments on the phylogenetic position ofDapediumLeach, 1822

A giant dapediid from the Late Triassic of Switzerland and insights into neopterygian phylogeny

Redescription and Phylogenetic Placement of †Hemicalypterus weiri Schaeffer, 1967 (Actinopterygii, Neopterygii) from the Triassic Chinle Formation, Southwestern United States: New Insights into Morphology, Ecological Niche, and Phylogeny

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