Life cycle of Dipetalonema sprenti Anderson (Nematoda: Filarioidea) of beaver (Castor canadensis)

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Abstract
Adult Dipetalonema sprenti Anderson occur mainly in the peritoneal cavity of beaver (Castor canadensis Kuhl). Microfilariae were taken up with blood and developed to the infective stage in the fat body of the abdomen and thorax of Aedes intrudens Dyar and A. abserratus (Felt and Young). At 27C the first molt occurred 4 to 6 days and the second molt 7 to 9 days after ingestion by the mosquito. Infective larvae were first seen in the head on the eighth day. A "sausage-stage" was present during development to the first molt at 27C but not at 23C. Microfilariae appeared in the blood of six previously uninfected beaver 116–135 days after each was injected with about 125 infective larvae. Aedes intrudens and A. abserratus fed on beaver in Algonquin Park, Ontario, from the first week of June until about the middle of July during 1970 and 1971. Transmission of D. sprenti may occur principally within beaver lodges or dens.

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