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Ultrastructure of embryonic envelopes and integument ofOncopeltus fasciatus dallas (Insecta, Heteroptera)

II. Secondary dorsal organ

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Summary

The embryo ofOncopeltus fasciatus forms a typical secondary dorsal organ (SDO). It develops after katatrepsis from the contracting serosa, the cells of which decrease in diameter but increase considerably in height. After 66 h, the SDO represents a protrusion of the serosal epithelium above the head and is then reduced to a disc-shaped formation, which sinks into the yolk, where it disintegrates after 80 h.

During its typical expression, between 66 and 78 h, the SDO shows a zonal arrangement of its cell organelles. The nucleus, which is located in the basal cell region, has a very irregular outline and includes several nucleoli and globular inclusion bodies. Rough and smooth ER are well developed around the nucleus and suggest the involvement of the organ in protein secretion as well as in lipid metabolism. Electron-lucent vacuoles and electron-dense granules, sometimes enclosed in the vacuoles, accumulate in the apical cell region, and are obviously extruded into the peripheral (extraembryonic) space. The formation of intercellular clefts and delicate cytoplasmic extensions facing the yolk and microvilli facing the periphery evidence a transporting function of the epithelium. Blisters intercalated in extended junctional complexes between apical cell regions point to the transport of solutes.

Because of the similarities of the processes observed in the SDO and in Malpighian tubules of larvae, an excretory function of the SDO is suggested. Final products of yolk and embryo are apparently transported to the extraembryonic space, where they accumulate during embryogenesis.

Phylogeny, relationship, and function of the different embryonic glands in Arthropoda (primary and secondary DO and pleuropodia) are discussed.

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  1. Institut für Zoologie, Johannes Gutenberg-Universität, Saarstr. 21, D-6500, Mainz, Federal Republic of Germany

    August Dorn

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  1. August Dorn
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Dedicated to Prof. Dr. B. Scharrer on the occasion of her birthday

Supported by the Deutsche Forschungsgemeinschaft

I am grateful to Miss K. Schmidtke and Mrs. M. Ullmann for technical assistance

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Dorn, A. Ultrastructure of embryonic envelopes and integument ofOncopeltus fasciatus dallas (Insecta, Heteroptera). Zoomorphologie 89, 57–72 (1978). https://doi.org/10.1007/BF00993782

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  • DOI: https://doi.org/10.1007/BF00993782

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