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File:External features of the Scyliorhinus stellaris egg case at stage 1.png

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Fig 1. External features of the 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.
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Source https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0206984 (2018) Oviparous elasmobranch development inside the egg case in 7 key stages. PLoS ONE 13(11): e0206984. https://doi.org/10.1371/journal.pone.0206984
Author Musa SM, Czachur MV, Shiels HA
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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.

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current00:16, 7 May 2024Thumbnail for version as of 00:16, 7 May 20242,170 × 866 (1.37 MB)Rasbak (talk | contribs){{Information |description=Fig 1. External features of the S. stellaris egg case at stage 1.<br> 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...

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