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Further Observations on the Life-history of Limnaea truncatula

Published online by Cambridge University Press:  06 April 2009

C. L. Walton  and
W. Norman Jones
C. L. Walton
Affiliation:
(Laboratory of Agricultural Zoology, Dept. of Agriculture, University College of North Wales, Bangor.)
W. Norman Jones
Affiliation:
(Laboratory of Agricultural Zoology, Dept. of Agriculture, University College of North Wales, Bangor.)
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Extract

1. Egg masses of Limnaea truncatula collected in March 1925 were isolated and hatched in the Laboratory. The average number of ova per mass (for 20) proved to be 9·75.

2. The hatching period lasted 12 to 26 days, with an average of 20–21 days (for the Spring generation).

3. On hatching, young snails were isolated, reared, and again oviposited during the first week of July. Ova from these snails again hatched during the first week of August.

4. It is thus shown that L. truncatula is self fertile; that oviposition can commence at a shell altitude of 4 to 4·5 mm.

5. Further data on growth-rates were obtained, showing that two (and probably three) generations occur between March and October.

Type
Research Article
Information
Parasitology , Volume 18 , Issue 2 , June 1926 , pp. 144 - 147
Copyright
Copyright © Cambridge University Press 1926

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References

1 Walton, C. L. (1918). Liver Rot of Sheep, and Bionomics of Limnaea truncatula in the Aberystwyth Area. Parasitology, X. 232–266.CrossRefGoogle Scholar