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In 20-day-old larvae, the mouth had increased in depth and led to a very narrow ciliated stomodaeum (Fig.
The ventral side of the embryo is flattened, the prosomal appendages (chelicerae, pedipalps, and walking legs) have begun to lengthen, the stomodaeum is located slightly anterior to the chelicerae, and the lateral organs have begun to develop (Sekiguchi et al.
On the ventral surface, the cells around the stomodaeum, about 10 in number, were monopolar and marked the position at which the adoral ciliated band will form [ILLUSTRATION FOR FIGURE 2A OMITTED].