File:Serranus atrarius and Salmo fario early development.jpg

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Description Fig 159. Early development of the sea bass, Serranus atrarius, and the trout, Salmo fario. (A-M after Wilson, 1889 and 1891; N-R after Kopsch, '11.) (A) Two-blastomere stage, showing anaphase of next division. (B) Eight-blastomere stage (slightly modified). (C) Sixteen-cell blastoderm. (D) Sixteen-cell stage, showing anaphase nuclei of next division. In the four centrally placed cells, the spindles are at right angles to the surface, thus forming a latitudinal cleavage furrow in these cells. (E) Section through center of four-blastomore stage. (F) Section through center of (D). Observe periblast tissue. (G) Section showing change from 16-cell stage into 32 cells; see (D). (H) Thirty-two to 64 cells. (1) Late cleavage blastoderm. Observe marginal and central periblast. (J) Multiplication of periblast nuclei around the margin of the blastoderm. (K-M) Late blastoderm, showing marginal and central periblast tissue. (N-R) Cleavage of the blastodisc of the trout. Observe that periblast tissue is derived from the blastodisc cytoplasm directly.
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Source https://archive.org/details/comparativeembry00nels/page/323/mode/1up?view=theater&q=BLASTULATION+ Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illustrations.
Author Nelsen, Olin E.

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current15:12, 11 March 2024Thumbnail for version as of 15:12, 11 March 2024997 × 1,231 (860 KB)Rasbak (talk | contribs){{Information |description=Fig 159. Early development of the sea bass, Serranus atrarius, and the trout, Salmo fario. (A-M after Wilson, 1889 and 1891; N-R after Kopsch, '11.) (A) Two-blastomere stage, showing anaphase of next division. (B) Eight-blastomere stage (slightly modified). (C) Sixteen-cell blastoderm. (D) Sixteen-cell stage, showing anaphase nuclei of next division. In the four centrally placed cells, the spindles are at right angles to the surface, thus forming a latitudinal cleav...

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