Shark Development

Embryology - 19 Apr 2024        Expand to Translate
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Introduction

Scyllium

Development of head and trunk mesoderm in the dogfish, Scyliorhinus torazame: I. Embryology and morphology of the head cavities and related structures

Evol Dev. 2012 May-Jun;14(3):234-56. doi: 10.1111/j.1525-142X.2012.00542.x.

Adachi N1, Kuratani S.

Abstract

Vertebrate head segmentation has attracted the attention of comparative and evolutionary morphologists for centuries, given its importance for understanding the developmental body plan of vertebrates and its evolutionary origin. In particular, the segmentation of the mesoderm is central to the problem. The shark embryo has provided a canonical morphological scheme of the head, with its epithelialized coelomic cavities (head cavities), which have often been regarded as head somites. To understand the evolutionary significance of the head cavities, the embryonic development of the mesoderm was investigated at the morphological and histological levels in the shark, Scyliorhinus torazame. Unlike somites and some enterocoelic mesodermal components in other vertebrates, the head cavities in S. torazame appeared as irregular cyst(s) in the originally unsegmented mesenchymal head mesoderm, and not via segmentation of an undivided coelom. The mandibular cavity appeared first in the paraxial part of the mandibular mesoderm, followed by the hyoid cavity, and the premandibular cavity was the last to form. The prechordal plate was recognized as a rhomboid roof of the preoral gut, continuous with the rostral notochord, and was divided anteroposteriorly into two parts by the growth of the hypothalamic primordium. Of those, the posterior part was likely to differentiate into the premandibular cavity, and the anterior part disappeared later. The head cavities and somites in the trunk exhibited significant differences, in terms of histological appearance and timing of differentiation. The mandibular cavity developed a rostral process secondarily; its homology to the anterior cavity reported in some elasmobranch embryos is discussed. © 2012 Wiley Periodicals, Inc. PMID 23017073

Additional Images

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  Digit origin - Tree shows phylogenetic relationships of shark, paddlefish, zebrafish and mouse.

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  Fig. 127. Section through the brain and olfactory organ of an embryo of scyllium

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  Fig. 395. From a transverse section through a shark (Scyllium) embryo of 15 mm

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  Branchial gill arch and columns, fissures branchiales in an embryo Shark

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  Fig. 342. The anterior end of an embryo of Shark

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  Fig. 535. The aortic arch in the shark embryo (Pristiurus)

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  Fig. 536. The arteries of the gill arch region of a shark embryo (Pristiurus)

References

Awruch, C. A., Pankhurst, N. W., Frusher, S. D., and Stevens, J. D. (2009). Reproductive seasonality and embryo development in the draughtboard shark Cephaloscyllium laticeps. Marine and Freshwater Research 60, 1265–1272.http://dx.doi.org/10.1071/MF090 http://www.publish.csiro.au/paper/MF09030.htm

de Beer, G. R. The Development of the Skull of Scyllium (Scyliorhinus) canicula L. http://jcs.biologists.org/content/s2-74/296/591.full.pdf

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• Shark Foundation - Reproduction

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Cite this page: Hill, M.A. (2024, April 19) Embryology Shark Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Shark_Development

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