File:Abatus cordatus Developmental stages.jpg
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Figure 2. Light micrographs of developmental stages of Abatus cordatus (Reference to the brooding cycle of Anse du Halage [about 250 days], Kerguelen Islands). (A) Female with one of the four brood pouches opened by discarding the protective spines. Arrows show embryos. (B) Oocyte 1 h after fertilization (the vegetal pole is turned up). (C) First [vertical] cleavage (2 days after fertilization) that gives the two first blastomeres upon horizontal constriction that separates the yolk mass (D) Young morula (8 days old). (E) Wrinkled stereoblastula (26 days old). Arrows indicate furrows. (F) Young gastrula (32 days old). (G) More advanced gastrula. (H) Hatching of the gastrula giving birth to the embryo. Arrows show the breaking of the fertilization membrane. (I) Young post-gastrula embryo. (J) Fully pigmented post-gastrula embryo. (K) Late post-gastrula embryo. The oral surface of the future juvenile is visible under the oral epithelium that is opening. (L) Young, short-spined juvenile (J,). (M) More advanced, short-spined juvenile viewed from the oral pole. (N) 240-day-old long-spined juvenile (J) viewed from the oral pole. (O) Late, long-spined juveniles in place in a brooding pouch just before “birth.” Abbreviations: ap, animal pole; az, ambulacral zone; bd, spine or podia bud; bl, blastomere; bp, closed blastopore; em, embryo; fc, fertilization cone; fm, fertilization membrane; mc, migrating cells; p, podia; pb, podia bud; pp, primary podia; rp, red pigmentation; S, spine; sa, stomodeal area; sb, spine bud; vp, vegetal pole; vs, vitelline space; ym, yolk mass. Scale bar = A, 2cm; B to M, 500 μm; N, 1 mm; O, 250 μm. Time scale is logarithmic. Roman numerals in the center refer to calendar months. |
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| Source | https://archive.org/details/biologicalbullet1901996lill/page/28/mode/1up?view=theater The Biological bulletin. Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. |
| Author | Lillie, Frank Rattray, Moore, Carl Richard, Redfield, Alfred Clarence. |
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| current | 21:55, 26 March 2024 | | 1,311 × 1,679 (1.1 MB) | Rasbak (talk | contribs) | {{information |description=Figure 2. Light micrographs of developmental stages of Abatus cordatus (Reference to the brooding cycle of Anse du Halage [about 250 days], Kerguelen Islands). (A) Female with one of the four brood pouches opened by discarding the protective spines. Arrows show embryos. (B) Oocyte | h after fertilization (the vegetal pole is turned up). (C) First [vertical] cleavage (2 days after fertilization) that gives the two first blastomeres upon horizontal constriction that s... |
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