| prevalence, geographic distribution, and fitness effects of microphallus turgidus (trematoda: microphallidae) in grass shrimp (palaemonetes spp.) from coastal georgia. | grass shrimp, palaemonetes pugio holthuis and p. vilgaris (say), were collected at 11 localities along the coast of georgia and surveyed for digenetic trematode metacercariae. the effect of trematode infection on grass shrimp fitness was also examined. microphallus turgidas (leigh) was the only trematode observed. the prevalence of metacercarial cysts of this parasite in p. pugio (75%) was higher than in p. vulgaris (24%), as were the mean intensity, abundance, and population density (no. cysts/ ... | 2002 | 12053986 |