A comparative analysis of the ontogeny of syngnathids (pipefishes and seahorses) reveals how heterochrony contributed to their diversification.

Autor: Schneider RF; Department of Zoology, Marine Evolutionary Biology, University of Kiel, Kiel, Germany.; Department of Marine Evolutionary Ecology, Helmholtz Centre for Ocean Research, Kiel, Germany., Woltering JM; Department of Evolutionary Biology, University of Konstanz, Konstanz, Germany., Adriaens D; Department of Biology, Ghent University, Ghent, Belgium., Roth O; Department of Zoology, Marine Evolutionary Biology, University of Kiel, Kiel, Germany.; Department of Marine Evolutionary Ecology, Helmholtz Centre for Ocean Research, Kiel, Germany.
Jazyk: angličtina
Zdroj: Developmental dynamics : an official publication of the American Association of Anatomists [Dev Dyn] 2023 May; Vol. 252 (5), pp. 553-588. Date of Electronic Publication: 2022 Nov 21.
DOI: 10.1002/dvdy.551
Abstrakt: Background: Syngnathids are a highly derived and diverse fish clade comprising the pipefishes, pipe-horses, and seahorses. They are characterized by a plethora of iconic traits that increasingly capture the attention of biologists, including geneticists, ecologists, and developmental biologists. The current understanding of the origins of their derived body plan is, however, hampered by incomplete and limited descriptions of the early syngnathid ontogeny.
Results: We provide a comprehensive description of the development of Nerophis ophidion, Syngnathus typhle, and Hippocampus erectus from early cleavage stages to release from the male brooding organ and beyond, including juvenile development. We comparatively describe skeletogenesis with a particular focus on dermal bony plates, the snout-like jaw morphology, and appendages.
Conclusions: This most comprehensive and detailed account of syngnathid development to date suggests that convergent phenotypes (e.g., reduction and loss of the caudal fins), likely arose by distinct ontogenetic means in pipefishes and seahorses. Comparison of the ontogenetic trajectories of S. typhle and H. erectus provides indications that characteristic features of the seahorse body plan result from developmental truncation. Altogether, this work provides a valuable resource and framework for future research to understand the evolution of the outlandish syngnathid morphology from a developmental perspective.
(© 2022 The Authors. Developmental Dynamics published by Wiley Periodicals LLC on behalf of American Association for Anatomy.)
Databáze: MEDLINE
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