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Fig. 3 | EvoDevo

Fig. 3

From: Formation of the initial kidney and mouth opening in larval amphioxus studied with serial blockface scanning electron microscopy (SBSEM)

Fig. 3

Conventional SEM series to determine the time of mouth opening. a 23-h larva; none the ten sampled had a mouth. b 24-h larva; one of two larvae out of ten that had open mouth (arrow) and preoral ciliated pit (arrowhead). c 25-h larva; all of the ten sampled had a mouth (arrow), an opening of the club-shaped gland (tandem arrow), and a preoral ciliated pit (arrowhead). All scale bars = 25 μm

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