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1 June 2011 The Unusual Life Cycle of Daubaylia potomaca, a Nematode Parasite of Helisoma anceps
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Abstract
Daubaylia potomaca is a parasitic nematode that exhibits a direct life cycle using planorbid snails as their only host. Within the snail host Helisoma anceps, all developmental stages of the parasite are present at any given time. The nematode has an unusual life cycle, with the adult female being the infective stage rather than the third-stage larvae (L3), as is commonly the case in many other parasitic nematode life cycles. In addition, length analysis showed that L1 and L2 were not present in tissues, suggesting that larvae hatch from eggs as the L3. Previous studies by other investigators show that adult females abandon Biomphalaria glabrata at some point between 3 and 9 days of host death; in the present study, adult female D. potomaca leave H. anceps up to 59 days (and a mean of 14.8 days) before host death. This observation indicates a striking physiological difference between an experimental and a natural host for the parasite.
Michael R. Zimmermann, Kyle E. Luth and Gerald W. Esch "The Unusual Life Cycle of Daubaylia potomaca, a Nematode Parasite of Helisoma anceps," Journal of Parasitology 97(3), (1 June 2011). https://doi.org/10.1645/GE-2604.1
Received: 19 July 2010; Accepted: 1 December 2010; Published: 1 June 2011
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