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Fig. 2 | Frontiers in Zoology

Fig. 2

From: The development and metamorphosis of the indirect developing acorn worm Schizocardium californicum (Enteropneusta: Spengelidae)

Fig. 2

Cleavage and gastrulation in Schizocardium californicum. Light micrographs. Animal pole is up. a Zygote. b 2-cell stage. c 4-cell stage. d 8-cell stage. e 16-cell stage. f 32-cell stage. g-i Formation of the coeloblastula. j Flat plate gastrula. k Mid-gastrula. l Pre-hatching gastrula. m Gastrula at time of hatching. n Post-hatching gastrula. a, archenteron; bc, blastocoel; bp, blastopore. Scale bars: 50 μm

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Frontiers in Zoology

ISSN: 1742-9994