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A comparative study ofTrilocularia acanthiaevulgaris Olsson 1867 (Cestoda, Tetraphyllidea) from the stomach and spiral valve of the spiny dogfish

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Abstract

Differences in the internal anatomy and ultrastructure ofTrilocularia acanthiaevulgaris from the stomach and spiral valve of the spiny dogfish are described with the aid of electron microscopy and light microscope histochemistry. Worms from the stomach rarely exceed 7 mm in length and do not exhibit signs of segmentation. In contrast, spiral valve worms are segmented, reach a length of some 30 mm and release free proglottides which mature whilst detached from the strobila. Numerous calcareous corpuscles and large glycogen-filled vacuolations occur throughout the body of stomach worms, but are almost totally absent from spiral valve worms. The neck region of spiral valve worms is packed with many germinative cells. The distal tegumental cytoplasm of the stomach worm contains many electron-lucid vesicles, mitochondria and forming microtriches. Microtriches on the tegumental surface are scant, and those present are directed posteriorly. The distal tegumental cytoplasm of the spiral valve worm contains few electron-lucid vesicles and mitochondria but has many dumb-bell-shaped vesicles. Microtriches are longer and more numerous than those of stomach worms. The differences suggest thatT. acanthiaevulgaris worms from the stomach are juveniles which migrate to the spiral valve where they develop into the adult.

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Authors and Affiliations

  1. Department of Zoology, The Queen's University, BT7 1NN, Belfast, Northern Ireland, UK

    J. S. McCullough & I. Fairweather

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  1. J. S. McCullough
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  2. I. Fairweather
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McCullough, J.S., Fairweather, I. A comparative study ofTrilocularia acanthiaevulgaris Olsson 1867 (Cestoda, Tetraphyllidea) from the stomach and spiral valve of the spiny dogfish. Z. Parasitenkd. 70, 797–807 (1984). https://doi.org/10.1007/BF00927132

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