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Explore the fascinating embryonic development stages of sea urchins, from first to third cleavage, ingression of primary mesenchyme cells, and invagination of archenteron. Witness the intricate processes in a vibrant biological context of sea urchin larva skeleton formation.
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5.3 Spindles at Fourth (unequal) Cleavage in a Purple Sea Urchin, Strongylocentrotus
5.7 Sea Urchin: Ingression of GFP-Labeled Primary Mesenchyme Cells
5.10 Polar Lobe Formation in the Scaphopod Mollusc Pulsellum