A microanatomical and histological study of the scales of the Devonian sarcopterygian <i>Miguashaia bureaui</i> and the evolution of the squamation in coelacanths

Mondéjar‐Fernández, Jorge; Meunier, François; Cloutier, Richard; Clément, Gérard; Laurin, Michel

doi:10.1111/joa.13428

Cited by 3 publications

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“…Fossil material used for the histological investigation is housed at the Musée d’Histoire naturelle de Miguasha (MHNM) and consists of a block (MHNM 06-1238, Fig. 1 ) containing scales and disarticulated elements ( Mondéjar-Fernández et al, 2021 ) associated with radial bones, most likely from the caudal fin of a single individual given the partial articulation and similar relative size of the osseous remains. Based on scale diameter (ca.…”

Section: Methodsmentioning

confidence: 99%

“…The retrogressive development of the endoskeleton is among the main trends identified in the long evolutionary history of coelacanths ( Jarvik, 1980 ; Cloutier, 1991a , 1991b ; Janvier, 1996 ; Forey, 1998 ), and includes not only the reduction in the number of bones but also the replacement of well-ossified elements by more cartilaginous ones in the skull and postcranium. The postcranial anatomy displays a relative morphological conservatism across coelacanth evolution, as shown by the general body shape, the appendicular skeleton, and the squamation ( Schaeffer, 1948 ; Forey, 1998 ; Mondéjar-Fernández et al, 2021 ). This morphological stasis may be linked to locomotor constraints ( Schaeffer, 1948 ; Cloutier, 1991a ), while paedomorphosis has been cited as the primary process responsible for reductive trends ( Lund & Lund, 1985 ; Forey, 1998 ).…”

Section: Introductionmentioning

confidence: 99%

“…Other bony tissues have been histologically surveyed, such as the mineralized plates surrounding the lung in extinct ( Brito et al, 2010 ) and extant taxa ( Cupello et al, 2017a , 2017b ; Meunier et al, 2021 ). However, contrary to the dermoskeleton ( Smith, Hobdell & Miller, 1972 ; Castanet et al, 1975 ; Giraud et al, 1978 ; Meunier, 1980 ; Meinke, 1982 ; Meunier & Zylberberg, 1999 ; Meunier et al, 2008 ; Mondéjar-Fernández et al, 2021 ), few histological studies have been carried out on the coelacanth endoskeleton ( Francillon et al, 1975 ), thus limiting our knowledge on its microstructure and evolution.…”

Section: Introductionmentioning

confidence: 99%

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Life history and ossification patterns inMiguashaia bureauireveal the early evolution of osteogenesis in coelacanths

Mondéjar‐Fernández

Meunier

Cloutier

et al. 2022

PeerJ

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The study of development is critical for revealing the evolution of major vertebrate lineages. Coelacanths have one of the longest evolutionary histories among osteichthyans, but despite access to extant representatives, the onset of their weakly ossified endoskeleton is still poorly understood. Here we present the first palaeohistological and skeletochronological study of Miguashaia bureaui from the Upper Devonian of Canada, pivotal for exploring the palaeobiology and early evolution of osteogenesis in coelacanths. Cross sections of the caudal fin bones show that the cortex is made of layers of primary bone separated by lines of arrested growth, indicative of a cyclical growth. The medullary cavity displays remnants of calcified cartilage associated with bony trabeculae, characteristic of endochondral ossification. A skeletochronological analysis indicates that rapid growth during a short juvenile period was followed by slower growth in adulthood. Our new analysis highlights the life history and palaeoecology of Miguashaia bureaui and reveals that, despite differences in size and habitat, the poor endoskeletal ossification known in the extant Latimeria chalumnae can be traced back at least 375 million years ago.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Life history and ossification patterns inMiguashaia bureauireveal the early evolution of osteogenesis in coelacanths

Mondéjar‐Fernández

Meunier

Cloutier

et al. 2022

PeerJ

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Transcriptomic and proteomic strategies to reveal the mechanism of Gymnocypris przewalskii scale development

Xu,

Cui,

et al. 2024

BMC Genomics

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Background Fish scales are typical products of biomineralization and play an important role in the adaptation of fish to their environment. The Gymnocypris przewalskii scales are highly specialized, with scales embedded in only specific parts of the dermis, such as the areas around the anal fin and branchiostegite, making G. przewalskii an ideal material for biomineralization research. In this study, we aimed to unveil genes and pathways controlling scale formation through an integrated analysis of both transcriptome and proteome, of which G. przewalskii tissues of the dorsal skin (no scales) and the rump side skin (with scales) were sequenced. The sequencing results were further combined with cellular experiments to clarify the relationship between genes and signaling pathways. Results The results indicated the following: (1) a total of 4,904 differentially expressed genes were screened out, including 3,294 upregulated genes and 1,610 downregulated genes (with a filtering threshold of |log2Fold-Change|> 1 and p-adjust < 0.05). The identified differentially expressed genes contained family members such as FGF, EDAR, Wnt10, and bmp. (2) A total of 535 differentially expressed proteins (DEPs) were filtered out from the proteome, with 204 DEPs downregulated and 331 DEPs upregulated (with a filtering threshold of |Fold-Change|> 1.5 and p < 0.05). (3) Integrated analyses of transcriptome and proteome revealed that emefp1, col1a1, col6a2, col16a1, krt8, and krt18 were important genes contributing to scale development and that PI3K-AKT was the most important signaling pathway involved. (4) With the use of the constructed G. przewalskii fibroblast cell line, emefp1, col1a1, col6a2, col16a1, krt8, and krt18 were confirmed to be positively regulated by the PI3K-AKT signaling pathway. Conclusion This study provides experimental evidence for PI3K-AKT controlled scale development in G. przewalskii and would benefit further study on stress adaptation, scale biomineralization, and the development of skin appendages.

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Osteichthyan Fishes from the uppermost Norian (Triassic) of the Fuchsberg near Seinstedt, Lower Saxony (Germany)

et al. 2022

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Fishes from the uppermost Norian Fuchsberg Quarry near Seinstedt are represented by two taxa that we interpret as a teleosteomorph (complete specimens) and actinistian (scales). Seinstedtia parva gen. et sp. nov. is described; although it was proposed as a possible semionotiform, this study reveals that Seinstedtia possesses a combination of teleosteomorph features, for instance: characteristic pholidophoriform-shaped cranial roof; fusion of skull roof bones; three dorsoposterior infraorbitals, including an enlarged infraorbital 3; one suborbital bone; movable premaxilla; and characteristic-shaped preopercle. In parallel, Seinstedtia possesses a head gently curved anteriorly, with lower jaw protruding slightly in front of upper jaw; supraorbital 1 forming most of anterodorsal margin of circumorbital ring; one supramaxilla; three extrascapulae; cleithrum with short and broad lower arm; and enlarged clavicle. This character combination places Seinstedtia as a teleosteomorph, family incertae sedis. This fish (total length ca. 50 mm) and some pholidophorids (ca. 70 mm or less; Parapholidophorus nybelini and Pholidoctenus serianus) represent the known smallest teleosteomorphs that inhabited Europe during the Norian. The isolated scales are elasmoid of amioid type ornamented with the elongated ridges of actinistians. This diversity of teleosteomorphs and actinistians in Fuchsberg Quarry during the Triassic indicates a connection to a marine environment.

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A microanatomical and histological study of the scales of the Devonian sarcopterygian Miguashaia bureaui and the evolution of the squamation in coelacanths

Cited by 3 publications

References 113 publications

Life history and ossification patterns inMiguashaia bureauireveal the early evolution of osteogenesis in coelacanths

Life history and ossification patterns inMiguashaia bureauireveal the early evolution of osteogenesis in coelacanths

Transcriptomic and proteomic strategies to reveal the mechanism of Gymnocypris przewalskii scale development

Osteichthyan Fishes from the uppermost Norian (Triassic) of the Fuchsberg near Seinstedt, Lower Saxony (Germany)

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