title: Periodic oviposition in the freshwater snail Lymnaea stagnalis: a new type of endogenous rhythm.
mesh_terms: D000818:Animals; D001683:Biological Clocks; D004777:Environment; D005260:Female; D008954:Models, Biological; D010063:Ovum; D010507:Periodicity; D012908:Snails / Q000502:physiology*