File:Catshark egg case stage 1.jpg
Catshark_egg_case_stage_1.jpg (723 × 289 pixels, file size: 81 KB, MIME type: image/jpeg)
Catshark S. stellaris egg case at stage 1
The internal ellipsoid egg yolk and blastodisc visible at stage 1 of development. The egg case membrane was filled with jelly surrounding the yolk. There were four seawater slits located at each corner of the egg case, two can be seen from the front (as shown in Fig 1), and another two at the back of the egg case (not shown). The flat end of the egg case will be the site of opening during hatching, whereas the arched end remains firm and closed during hatching. There are four tendrils attached at each corner of the egg case. The key feature for stage 1 was no visible embryo on top of the egg yolk.
See S1 File for original photographs of Fig 1 illustration.
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 1 Pone.0206984.g001.jpg
Cite this page: Hill, M.A. (2024, April 28) Embryology Catshark egg case stage 1.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Catshark_egg_case_stage_1.jpg
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
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