Himasthla quissetensis and Lepocreadium setiferoides: emergence patterns from their molluscan host, Nassarius obsoletus.
D000818:Animals; D003624:Darkness; D007814:Larva; D008027:Light; D010507:Periodicity; D012908:Snails / Q000469:parasitology*; D014200:Trematoda / Q000502:physiology*