A progenetic trematode (lecithodendriidae) life cycle involving Rana aurora Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/wm117s060

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  • A fluke found in the intestine of the red-legged frog, Rana aurora Baird and Girard, was identified as Brachycoelium lynchi Ingles 1936. The life cycle of this fluke was studied and found to be of the lecithodendriid type rather than brachycoeliid. Instead of having one intermediate host, as is the case with the brachycoeliids, this fluke developed through a typical three host lecithodendriid life cycle. The adults shed eggs which passed from Rana aurora with the feces. Rediae developed in seven percent of the Bythinella hemphilli Pilsbry snails which inhabited the streams at high elevations on Marys Peak, Benton County, Oregon. Small numbers of microcercous xiphidiocercariae were shed from the snails and penetrated aquatic insect larvae. Acroneuria californica (Banks) was the primary second intermediate host and harbored small (0.240 mm) and large (0.50 mm) metacercarial cysts in the fat body some of which were progenetic. The two sizes of metacercariae were probably due to the downstream migration of the insect nymphs through the area in which the infected snails were found. Also periodic cercarial shedding and the long nymphal life of the insect may have contributed to this condition. When these metacercariae were fed to uninfected frogs the adult worms were recovered from the intestine. Only Rana aurora collected in the foothills of Marys Peak harbored natural infections of this fluke. This study indicated that this fluke was taxonomically between the lecithodendriid genera Prosthodendrium Dolifus 1931, and Pycnoporus Looss 1899. It had characters of both genera but differed markedly from them; therefore, a new genus, Prosthopycoides, which will be published at a later date, is proposed for this fluke, the new combination being Prosthopycoides lynchi (Ingles 1936).
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