Abstract
As only the adult of G. nipponicum is known, 129 snakes and 33 weasels obtained in Kagawa Prefecture, Japan were examined for larvae. Hitherto undocumented larvae, later identified as G. nipponicum, were recovered from 3 snakes and 1 weasel. The life cycle was experimentally completed from eggs to adult worms. Cyclops, the 1st intermediate hosts, were infected by feeding them newly hatched larvae from uterine eggs. Advanced 3rd-stage larvae were obtained from 2 rats and 1 mouse which had ingested early 3rd-stage larvae from cyclops. A ferret fed advanced 3rd-stage larvae from rats had adult worms in esophageal tumors 100 days after exposure.

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