Studies on the dioecious tapeworm Gyrocoelia pagollae with emphasis on bionomics, oogenesis, and embryogenesis (original) (raw)
Summary
The oogenotop was studied using certain histochemical tests and the contributions of the various parts to the egg were noted. The Mehlis gland and the uterine epithelium make large contributions to the egg. Both the inner and outer envelopes are of reduced importance. A photographic record of oogenesis is presented showing it follows previous descriptions for the Cestoda. The first cleavage is unequal. Shell granules from the oocyte are carried to the macromeres where they are used in the formation of the outer capsule. Hatching is standard for eggs with a membraneous inner capsule. Most infections are characterized by one female and one male worm. Microsporidians reduce the number of sperm produced and probably limit the production of oncospheres.
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Abbreviations
Bm:
Blastomeres
IC:
Inner Capsule
IE:
Inner Envelope
M:
Mehlis
Ma:
Macromere
MG:
Mucosa Gland
OC:
Outer Capsule
OE:
Outer Envelope
OM:
Oncospheral Membrane
Ov:
Oviduct
PB:
Polar Body
PN:
Pronuclei
S:
Sperm
SG:
Serous Gland
U:
Uterus
UD:
Uterine Duct
VC:
Vitelline Cell
VG:
Vitelline Gland
References
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Authors and Affiliations
- Department of Systematics and Ecology, University of Kansas, 66044, Lawrence, Kansas, USA
William H. Coil
Additional information
This study was supported by grants NSF GB 2353, G 18535, NIH 05145, and Fr 07037 from the Biomedical Sciences Support.
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Coil, W.H. Studies on the dioecious tapeworm Gyrocoelia pagollae with emphasis on bionomics, oogenesis, and embryogenesis.Z. Parasitenk. 39, 183–194 (1972). https://doi.org/10.1007/BF00329454
- Received: 08 October 1971
- Issue date: September 1972
- DOI: https://doi.org/10.1007/BF00329454