Hymenolepis lanceolata, a parasite of geese and ducks, has been reported once for man. The supposed cysticercoid occurs in various small crustaceans of the family Cyclopidæ.
Several other cestode parasites of domestic animals are believed to develop their intermediate stage in certain arthropods. Among these may be mentioned:
Choanotænia infundibulformis, of chickens, developing in the house-fly (Grassi and Rovelli);
Davainea cesticillus, of chickens, in some lepidopter or coleopter (Grassi and Rovelli);
Hymenolepis anatina, H. gracilis, H. sinuosa, H. coronula and Fimbriaria fasciolaris, all occurring in ducks, have been reported as developing in small aquatic crustaceans. In these cases, cysticercoids have been found which, on account of superficial characters, have been regarded as belonging to the several species, but direct experimental evidence is scant.