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Ultrastructure of the larval corpus allatum of Hyphantria cunea drury (Insecta, Lepidoptera)

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Summary

The corpora allata of the three last larval instars were studied in newly molted animals, at the beginning, middle, and end of the feeding period, and during the molt period. They were found to consist of uniform gland cells, whose ultrastructure changes in the course of the instars.

In gland cells considered to be resting, the outer and inner nuclear membranes run in parallel without forming a dilated perinuclear space. Mitochondria are small, polymorphic, with an electron-dense matrix. The smooth endoplasmic reticulum (SER) appears as stacks of parallel cisternae near the nuclear envelope and in the rest of the cytoplasm, and as accumulations of twisted profiles. Occasionally, the SER takes the form of paracrystalline bodies. There are few small smooth-surfaced vesicles in the cytoplasm.

In cells considered as active, a dilated perinuclear space occurs. The peripheral ends of profiles forming the SER are swollen, and numerous vesicles and vacuoles bud off from them to fill the cytoplasm. Mitochondria are large, with a more transparent matrix. The plasma membrane of gland cells located just beneath the connective tissue sheath forms numerous small invaginations.

The corpora allata consist of resting cells during the molt periods. At the beginning of each instar, few active gland cells appear. In the middle of the second to last and the third to last instars, the bulk of the gland cells is active. At the end of these instars, there are both active and inactive cells. In the middle of the last instar, the gland cells are inactive or subactive, and at its end, all gland cells are completely inactive.

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  1. Institute of Evolutionary Morphology and Ecology of Animals, Academy of Sciences of the USSR, Moscow

    Elena J. Melnikova &  Alexej A. Panov

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  1. Elena J. Melnikova
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  2. Alexej A. Panov
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Melnikova, E.J., Panov, A.A. Ultrastructure of the larval corpus allatum of Hyphantria cunea drury (Insecta, Lepidoptera). Cell Tissue Res. 162, 395–410 (1975). https://doi.org/10.1007/BF00220186

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