Hostname: page-component-78c5997874-t5tsf Total loading time: 0 Render date: 2024-11-02T22:05:35.468Z Has data issue: false hasContentIssue false
  • English
  • Français

Selenocystis foliata (Ray) from Scolelepis fuliginosa Clpde. and its identity with Haplozoon sp.1

Published online by Cambridge University Press:  06 April 2009

M. J. Dibb
M. J. Dibb
Affiliation:
From the Department of Zoology, King's College, University of London
Get access Rights & Permissions [Opens in a new window]

Extract

1. The so-called parasitic dinoflagellate occurring in the gut of the polychaete worm Scolelepis fuliginosa Clpde. is described and is shown to be the sexual phase of the gregarine “Selenidium foliatum” Ray.

2. The gametocytes (often very unequal) associate by their posterior ends while in situ. One remains attached and its epimerite is transformed into a foot-like organ serving to attach the gametocyst to the host throughout the rest of development. The gametocyst is elongate and pyriform (26−226 × 9−34 μ) and its formation involves very little alteration in the shape of the gametocytes. Solitary encystment also occurs.

3. The first gametocytic nuclear division is described. Forerunners of the gamete nuclei are formed within the nuclear area of the gametocyte. Flagellated isogametes are formed. There is no residuum.

4. The spores are spherical, averaging 8·5μ in diameter, the number depending on the size of the cyst enveloping them. When ripe, they contain four or eight spindle-shaped sporozoites 9·4−14 × 2−3·75μ and, in vivo, a central, spherical, refrigent residuum.

5. A new genus Selenocystis is proposed for this organism, with S. foliata (Ray) as the type species. Although I have not found its asexual phase, the probability is that it may still be classified among the schizogregarines.

Type
Research Article
Information
Parasitology , Volume 30 , Issue 3 , September 1938 , pp. 296 - 308
Copyright
Copyright © Cambridge University Press 1938

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Brasil, L. (1907). Recherches sur le cycle évolutif des Selenidiidae, grégarines parasites d'annélides polychètes. I. La schizogonie et la croissance des gamétocytes chez Selenidium caulleryi n.sp. Arch. Protistenk. 8, 370.Google Scholar
Caullery, M. & Mesnil, F. (1898). Sur une grégarine coelomique présentant, dans son cycle évolutif, une phase de multiplication asporulée. C.R. Acad. Sci., Paris, 126, 262.Google Scholar
Caullery, M. & Mesnil, F. (1899). Sur quelques parasites internes des annélides. Trav. Stat. zool. Wimereux, 7, 80.Google Scholar
Caullery, M. & Mesnil, F. (1900). Sur une mode particulier de division nucléaire chez les grégarines. Arch. Anat. micr. 3, 146.Google Scholar
Chatton, E. (1920). Les péridiniens parasites. Arch. Zool. Exp. Gén. 59, 1.Google Scholar
Dobell, C. (1925). The life-history and chromosome cycle of Aggregata eberthi. Parasitology, 17, 1.CrossRefGoogle Scholar
Dogiel, V. (1910). Untersuchungen über einige neue Catenata. Z. wiss. Zool. 94, 400.Google Scholar
Fowell, R. R. (1936). Observations on the Sporozoa inhabiting the gut of the polychaete worm Polydora flava Clpde. Parasitology, 28, 414.CrossRefGoogle Scholar
Keilin, D. (1920). On two new gregarines, Allantocystis dasyhelei n.g., n.sp., and Dendrorhynchus systeni n.g., n.sp., parasitic in the alimentary canal of the dipterous larvae, Dasyhelea obscura Winn: and Systenus sp. Parasitology, 12, 154.CrossRefGoogle Scholar
Léger, L. (1892). Recherches sur les grégarines. Tabl. Zool. 3, 1.Google Scholar
Léger, L. (1904). La reproduction sexuée chez les Stylorhynchus. Arch. Protistenk. 3, 303.Google Scholar
Léger, L. (1910). Les schizogrégarines des Trachéates. II. Le genre Schizocystis. Arch. Protistenk. 18, 83.Google Scholar
Machado, A. (1913). Über den Entwicklungskreis einer Gregarine, Schizocystis spinigeri aus Spiniger sp. Mem. Instit. Oswaldo Cruz, 5, 5.CrossRefGoogle Scholar
Mackinnon, D. L. & Ray, H. N. (1933). The life cycle of two species of “Selenidium” from the polychaete worm Potamilla reniformis. Parasitology, 25, 143.CrossRefGoogle Scholar
Ray, H. N. (1930). Studies on some sporozoa in polychaete worms. I. Gregarines of the genus Selenidium. Parasitology, 22, 370.CrossRefGoogle Scholar
Reed, N. (1933). Sporogony in Selenidium mesnili Brasil, a sporozoan parasite of Myxicola infundibulum Mont. Parasitology, 25, 402.CrossRefGoogle Scholar
Schnitzler, H. (1905). Über die Fortpflanzung von Clepsidrina ovata. Arch. Protistenk. 6, 309.Google Scholar
Shumway, W. (1924). The genus Haplozoon, Dogiel. Observations on the life-history and systematic position. J. Parasit. 11, 59.CrossRefGoogle Scholar
Watson, M. E. (1916). Studies on gregarines. Illinois biol. Monogr. No. 2.Google Scholar