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A timeline of pharyngeal endoskeletal condensation and differentiation in the shark, Scyliorhinus canicula, and the paddlefish, Polyodon spathula
Gillis, J.A.; Modrell, M.S.; Baker, C.V.H. (2012). A timeline of pharyngeal endoskeletal condensation and differentiation in the shark, Scyliorhinus canicula, and the paddlefish, Polyodon spathula. J. Appl. Ichthyol. 28(3): 341-345. https://dx.doi.org/10.1111/j.1439-0426.2012.01976.x
In: Journal of Applied Ichthyology = Zeitschrift für angewandte Ichthyologie. Blackwell: Berlin. ISSN 0175-8659; e-ISSN 1439-0426, more
Peer reviewed article  
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Keywords
    Marine Sciences
    Marine Sciences > Marine Sciences General
    Scientific Community
    Scientific Publication
    Marine/Coastal
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  • Association of European marine biological laboratories, more
Authors  Top 
  • Gillis, J.A.
  • Modrell, M.S.
  • Baker, C.V.H.
Abstract
    The lesser-spotted dogfish (Scyliorhinus canicula) and the North American paddlefish (Polyodon spathula) are two emerging model systems for the study of vertebrate craniofacial development. Notably, both of these taxa have retained plesiomorphic aspects of pharyngeal endoskeletal organization, relative to more commonly used models of vertebrate craniofacial development (e.g. zebrafish, chick and mouse), and are therefore well suited to inform the pharyngeal endoskeletal patterning mechanisms that functioned in the last common ancestor of jawed vertebrates. Here, we present a histological overview of the condensation and chondrogenesis of the most prominent endoskeletal elements of the jaw, hyoid and gill arches – the palatoquadrate/Meckel’s cartilage, the hyomandibula/ceratohyal, and the epi-/ceratobranchial cartilages, respectively – in embryonic series of S. canicula and P. spathula. Our observations provide a provisional timeline and anatomical framework for further molecular developmental and functional investigations of pharyngeal endoskeletal differentiation and patterning in these phylogenetically informative taxa.
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