Origin and Diversification of Acipenseriforms

Tsessarsky, A. A.

doi:10.1134/s0032945222060297

Cited by 2 publications

(2 citation statements)

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“…Paedomorphosis, a heterochronic shift resulting in delayed onset of development and early truncation of musculoskeletal differentiation, is thought to play a major role in establishing this morphological condition in sturgeons (Bemis, Findeis, & Grande, 1997;Tsessarsky, 2020Tsessarsky, , 2022Warth et al, 2017Warth et al, , 2018.…”

Section: Introductionmentioning

confidence: 99%

“…Associated with this hyostylic condition in sturgeons, the musculature of the mandibular and hyoid arch is also derived compared to other actinopterygians (Arratia & Schultze, 1991; Warth, Hilton, Naumann, Olsson, & Konstantinidis, 2017), yet secondarily simplified (Edgeworth, 1935) by developmental truncation. Paedomorphosis, a heterochronic shift resulting in delayed onset of development and early truncation of musculoskeletal differentiation, is thought to play a major role in establishing this morphological condition in sturgeons (Bemis, Findeis, & Grande, 1997; Tsessarsky, 2020, 2022; Warth et al, 2017, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Development of the branchial musculature of the Siberian sturgeon (Acipenser baerii) reveals a heterochronic shift during the evolution of acipenseriform cranial muscles

Naumann¹,

Warth

Hammel

et al. 2023

Preprint

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Heterochronic shifts are regarded one of the major evolutionary changes acting on developmental modules and underlying the origin of morphological disparity. Conserved characters, rarely subject to heterochronic shifts during the curse of evolution, in contrast could indicate underlying developmental or functional constraints. Here we use the development of the cranial musculature Siberian sturgeon (Acipenser baerii) as a model to investigate the role of heterochrony during the evolution of the craniofacial system of Actinopterygii. Using histology, fluorescent antibody staining and fast propagation-based phase contrast imaging in combination with 3D-reconstruction we describe the development of the branchial and hypobranchial musculature. We show that the development of the first branchial arch is accelerated compared to other basal-branching actinopterygians leading to a more synchronous development with the hyoid arch. A pattern that could relate to the derived migratory behaviour of the neural crest cells in sturgeons. In contrast, the developmental timing of the more posterior branchial musculature, including the cucullaris muscle in the Siberian sturgeon, appears to be highly conserved compared to other Actinopterygii and even Osteognathostomata. This could indicate the presence of functional or developmental constraints underlying the evolution of the muscles at the head/trunk interface.

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