File:Catshark egg case stages1-7.jpg
Catshark_egg_case_stages1-7.jpg (712 × 539 pixels, file size: 94 KB, MIME type: image/jpeg)
Seven key developmental stages of catshark (Scyliorhinus stellaris) inside the egg case
Stage 1 was characterized by no visible embryo.
Stage 2 was identified as an early embryo formed on the surface of the egg yolk membrane.
Stage 3 embryos had long tails and stage 4 embryos had externalized gill filaments. These filaments had shrunk by stage 5.
In stage 6 the key feature was the loss of fin-folds.
Stage 7 the key feature was the fully consumed external yolk.
Reference
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.
Copyright
© 2018 Musa et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Fig 8 Pone.0206984.g008.jpg https://doi.org/10.1371/journal.pone.0206984.g008
Cite this page: Hill, M.A. (2024, April 19) Embryology Catshark egg case stages1-7.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Catshark_egg_case_stages1-7.jpg
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
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