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Studies on the germ cell cycle of the digenetic trematode Parorchis acanthus Nicoll

Part II. Structure of the miracidium and germinal development in the larval stages

Published online by Cambridge University Press:  06 April 2009

Gwendolen Rees
Gwendolen Rees
Affiliation:
Department of Zoology, University College of Wales, Aberystwyth
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Extract

1. The anatomy of the adult miracidium of Parorchis acanthus is described.

2. Development of the miracidium and of the succeeding larval stages has been followed.

3. Cleavage of the fertilized egg gives rise to an ectodermal and a propagatory cell. The former gives rise to the soma, and the latter, after contributing a few small cells to the body of the miracidium, becomes the germ cell.

4. This germ cell develops in the same way into the first generation redia while still in the body of the miracidium.

5. The fully formed miracidium contains a single fully formed redia when it penetrates the intermediate molluscan host.

6. In the intermediate host the miracidium disintegrates and second generation rediae are formed from the germ cells in the body cavity of the parent redia.

7. The germ cells in the body cavity of the daughter redia give rise to cercariae by a similar process of embryonic development to that found in preceding generations.

8. The germ cells in the cercariae become differentiated into the adult genitalia.

9. No evidence has been found to show that rediae or cercariae are derived from cells in the wall of the redia.

10. No ovary, maturation process, parthenogenesis, or fertilization takes place in any of the larval stages, but germinal lineage is apparent throughout the life cycle.

Type
Research Article
Information
Parasitology , Volume 32 , Issue 4 , November 1940 , pp. 372 - 391
Copyright
Copyright © Cambridge University Press 1940

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References

REFERENCES

Brooks, F. G. (1930). Amer. J. Hyg. 12, 299–340.Google Scholar
Bennett, H. J. (1936). Ill. Biol. Monogr. 14, 4, 1–119.Google Scholar
Cable, R. M. (1934). Quart. J. micr. Sci. 76, 573–614.Google Scholar
Coe, W. R. (1896). Zool. Jb. Abt. Anat. 9, 561–71.Google Scholar
Cort, W. W. (1919). Univ. Calif. Publ. Zool. 18, 509–19.Google Scholar
Dobrovolny, C. G. (1939). Trans. Amer. micr. Soc. 58, 121–55.CrossRefGoogle Scholar
Dollfus, R. (1919). C.S. Acad. Sci., Paris, 168, 124–7.Google Scholar
Faust, E. C. & Meleney, H. E. (1924). Amer. J. Hyg. Monogr. Ser. 3.Google Scholar
Goldschmidt, R. (1905). Zool. Jb. Abt. Anat. Ont. 21, 605–54.Google Scholar
Ishii, Y. (1934). J. Med. Ass. Formosa, 33, 349–412.Google Scholar
Johnson, J. C. (1920). Univ. Calif. Publ. Zool. 19, 335–88.Google Scholar
Kathariner, L. (1904). Zool. Jb. Fetschr. Weismann, Suppl. 7, pp. 519–50.Google Scholar
Kathaeiner, L. (1920). Zool. Anz. 51, 220–3.Google Scholar
Krull, W. H. & Price, H. F. (1932). Papers Univ. Mich. no. 237.Google Scholar
Leuckart, R. (1879). Die Parasiten der Menschen etc. 2. Aufl., V. 1, 1. Lief., 1. Abt. 1–336.Google Scholar
Leuckart, R. (1882). Arch. Naturgesch. 48, 80–119.Google Scholar
Linton, E. (1914). Proc. U.S. Nat. Mus. 46, 551–55.CrossRefGoogle Scholar
Looss, A. (1892). Fests. zum 70. Geburts. R Leuckart, 147–67.Google Scholar
Linton, E. (1896). Mem. Inst. Egypt, 3, 1–252.Google Scholar
Lynch, J. E. (1933). Quart. J. micr. Sci. 76, 13–33.Google Scholar
Manter, H. W. (1926). Ill. Biol. Monogr. 10, 2, 1–138.Google Scholar
Ortmann, W. (1908). Zool. Jb. Anat. 26, 255–93.Google Scholar
Pin-Dji, Chen (1937). Trans. Amer. micr. Soc. 56, 208–36.Google Scholar
Price, H. F. (1931). Amer. J. Hyg. 13, 685–727.Google Scholar
Rees, G. (1937). Proc. zool. Soc. Land. B, Part 1, pp. 65–73.CrossRefGoogle Scholar
Rees, G. (1939). Parasitology, 31, 4, 417–33.CrossRefGoogle Scholar
Reisinger, E. (1923). Zool. Anz. 57, 1–20.Google Scholar
Schauinsland, H. (1883). Z. Naturw. 16, 465–529.Google Scholar
Schwarze, W. (1886). Z. wiss. Zool. 43, 41–86.Google Scholar
Sewell, R. B. S. (1922). Ind. J. med. Res. 10, 1–366.Google Scholar
Sinitsin, D. (1931). Z. wiss. Zool. 138, 3, 409–56.Google Scholar
Stunkard, H. W. (1923). Bull. Amer. Mus. not. Hist. 48, 165–221.Google Scholar
Thomas, A. P. (1883). Quart. J. micr. Sci. 23, 99–133.Google Scholar