Internal morphology of the hypopus of Caloglyphus mycophagus (Megnin) (Acarina: Acaridae)
1971 - Volume: 13 Issue: 1 pages: 156-170
The internal morphology and histology of the hypopial stage of Caloglyphus mycophagus is described from serial sections fixed in 10% acrolein and embedded in glycol methacrylate. There is no oral opening or salivary glands; the alimentary tract is rudimentary; there is the anal opening; and only one epithelial cell type is present in each region. The rectum appears to have many vacuoles in the lumen. The nervous system shows very little change from that of the adult. The gonad tissue is paired but rudimentary and insufficiently developed to determine the sex. Some muscles are present in both adult and hypopus, others occur in the hypopus only and are characteristic of this stage. The cuticle is considerably thicker in the hypopus than in other stages and appears to have numerous pore canals . Attention is drawn to the anatomical differences between the hypopus and the adult and between the hypopi of other species. Their functional significance is also discussed.
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