Developmental stages of echinoderms. a) Strongylocentrotus purpuratus embryo where m and s stand for the mouth and stomach along the A-P axis respectively ... |
15 июл. 2017 г. · All echinoderms also develop through a larval stage, which ancestrally was a feeding, planktotrophic larva, but has repeatedly and independently ... |
(B-E) Selected stages of Paracentrotus lividus development: (B) 16-cell stage; (C) 32-cell stage; (D) blastula stage; and (E) mid-gastrula stage, showing the ... |
1. Development in echinoderms may be indirect, involving pelagic, bilaterally symmetrical, larval forms, or more or less direct, with the larval stage ... |
Abstract. Sea Urchin is one of the most useful tools in developmental biology studies because this organism has the simplest kind of developmental stages. |
(A) Sperm-egg contact. (B) First visible evidence of fertilization envelope formation. (C-H) Sequential stages of fertilization envelope formation. |
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