Fig. 5

Distal tip of the hypopharynx. Structure of the hypopharynx tip. a-f Distal tip of hypopharynx by light microscopy. The hypopharynx ends in approximately ten finger-like projections of variable length. In f, the fingers are not obvious and appear to be retracted or curled up; this was the appearance in about one third of specimens examined. The opening of the salivary duct can be seen clearly in a. Scale-bars: 2 μm