STUDIES ON CESTODES OF THE GENUS TRIAENOPHORUS FROM FISH OF LESSER SLAVE LAKE, ALBERTA: II. THE EGGS, CORACIDIA, AND LIFE IN THE FIRST INTERMEDIATE HOST OF TRIAENOPHORUS CRASSUS FOREL AND T . NODULOSUS (PALLAS)
The eggs of Triaenophorus crassus vary from 53 to 68 μ long by 38 to 44 μ in diameter. Those of T. nodulosus are practically the same ranging from 58 to 67 μ long by 38 to 44 μ in diameter. Movement of the embryo within the egg is discernible two days before hatching. The eggs of one individual hatc...
| Published in: | Canadian Journal of Research |
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| Main Author: | |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Canadian Science Publishing
1943
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1139/cjr43d-023 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjr43d-023 |
| Summary: | The eggs of Triaenophorus crassus vary from 53 to 68 μ long by 38 to 44 μ in diameter. Those of T. nodulosus are practically the same ranging from 58 to 67 μ long by 38 to 44 μ in diameter. Movement of the embryo within the egg is discernible two days before hatching. The eggs of one individual hatch over a period of eight to 10 days.The coracidia of T. crassus are from 67 to 80 μ long by 49 to 58 μ wide and of T. nodulosus from 67 to 85 μ long by 58 to 80 μ in diameter. The coracidia live for two or three days and are free swimming for most of this time.The first intermediate host of both species in Lesser Slave Lake is Cyclops bicuspidatus Claus; the coracidia of both species will also infect Diaptomus ashlandi Marsh, but fail to develop in this copepod. The procercoids develop in the body cavity of the Cyclops in eight to 10 days after their entry; both species attain in this time an average length of 300 μ. Where a large number of procercoids occurs simultaneously in one Cyclops the growth rate is slower and the maximum size attained is less. |
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