File:Aphis rosae segmentation.jpg

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Description FIG. 57. SEGMENTATION OF APHIS ROSAE. (Copied from Metschnikoff.) In all the stages there is seen to be a central yolk mass surrounded by a layer of protoplasm. In this protoplasm two nuclei have appeared in 1, four nuclei in 2. In 3 the nuclei have arranged themselves regularly, and in 4 the protoplasm has become divided into a number of columnar cells corresponding to the nuclei. w. pole of the blastoderm which has no share in forming the embryo
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https://archive.org/details/theworks02balfuoft/page/116/mode/2up?view=theater&q=blastoderm THE WORKS OF FRANCIS MAITLAND BALFOUR VOL. III

A TREATISE ON COMPARATIVE EMBRYOLOGY.
Author M. FOSTER, F.R.S., ADAM SEDGWICK, M.A.,

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current22:34, 29 February 2024Thumbnail for version as of 22:34, 29 February 2024935 × 387 (345 KB)Rasbak (talk | contribs){{Information |description=FIG. 57. SEGMENTATION OF APHIS ROSAE. (Copied from Metschnikoff.) In all the stages there is seen to be a central yolk mass surrounded by a layer of protoplasm. In this protoplasm two nuclei have appeared in 1, four nuclei in 2. In 3 the nuclei have arranged themselves regularly, and in 4 the protoplasm has become divided into a number of columnar cells corresponding to the nuclei. w. pole of the blastoderm which has no share in forming the embryo |source=https://ar...

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