|Embryology - 2 Jun 2020 Expand to Translate|
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|A personal message from Dr Mark Hill (May 2020)|
|contributors to the site. The good news is Embryology will remain online and I will continue my association with UNSW Australia. I look forward to updating and including the many exciting new discoveries in Embryology!|
This page gives a brief introduction to shark development, a species used in many historic comparatively e embryology studies. The largest extant fish is the whale shark (Rhincodon typus).
|Animal Development: axolotl | bat | cat | chicken | cow | dog | dolphin | echidna | fly | frog | goat | grasshopper | guinea pig | hamster | horse | kangaroo | koala | lizard | medaka | mouse | opossum | pig | platypus | rabbit | rat | sea squirt | sea urchin | sheep | worm | zebrafish | life cycles | development timetable | development models | K12|
Some Recent Findings
|More recent papers|
This table allows an automated computer search of the external PubMed database using the listed "Search term" text link.
|These papers originally appeared in the Some Recent Findings table, but as that list grew in length have now been shuffled down to this collapsible table.
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."
Catshark Early Stages
A recent paper has categorised early catshark cyliorhinus stellaris development into 7 identifiable stages.
- Musa SM, Czachur MV & Shiels HA. (2018). Oviparous elasmobranch development inside the egg case in 7 key stages. PLoS ONE , 13, e0206984. PMID: 30399186 DOI.
- Onimaru K, Motone F, Kiyatake I, Nishida K & Kuraku S. (2018). A staging table for the embryonic development of the brownbanded bamboo shark (Chiloscyllium punctatum). Dev. Dyn. , 247, 712-723. PMID: 29396887 DOI.
- Adachi N & Kuratani S. (2012). Development of head and trunk mesoderm in the dogfish, Scyliorhinus torazame: I. Embryology and morphology of the head cavities and related structures. Evol. Dev. , 14, 234-56. PMID: 23017073 DOI.
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. (2020, June 2) Embryology Shark Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Shark_Development
- © Dr Mark Hill 2020, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G