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The Structure of the Silk Glands of Apanteles glomeratus L

Robert Matheson and A. G. Ruggles
The American Naturalist
Vol. 41, No. 489 (Sep., 1907), pp. 567-585
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Page Count: 18
Subjects: Ecology & Evolutionary Biology Biological Sciences
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1. The silk glands of Apanteles glomeratus differ from those in the Lepidoptera and Trichoptera in that there are four tubes in the abdominal region. Their histological structure is similar to that of Lepidoptera and Trichoptera but differs markedly from that described for the tenthredinid larvae. 2. In immature larvae the epithelial cells of the whole producing region are actively secreting. Numerous vacuoles are present in these secreting cells, especially near the periphery. 3. In glands fixed in Flennning's solution and stained with iron haematoxylin there are present, near the inner margin of the secreting cells, many black rounded granules. These are very abundant in the 2nd thoracic portion and absent in the 1st thoracic portion. Their nature and function we were unable to determine. 4. In mature larvae the abdominal division becomes greatly distended and nearly fills the entire body cavity. It is probable that this portion now acts merely as a reservoir and that its cells, have ceased secreting. 5. The glands of Philippi are absent and it is probable that the second thoracic portion performs the functions of these glands. 6. The press is well developed. It differs from that of the Lepidoptera in that the lateral pair of muscles is absent, and from that of the Trichoptera in that there is a single pair of dorsal muscles rather than two distinct pairs. 7. The product of the gland is a double thread as in the Lpidoptera and Trichoptera.