title: [Biology of Biomphalaria occidentalis Paraense, 1981 and Biomphalaria tenagophila (d'Orbigny, 1835), in laboratory conditions].
abstract: Specimens of Biomphalaria occidentialis and Biomphalaria tenagophila were reared in S. Paulo, Brazil under laboratory conditions, with a view to know their biological characteristics. Oviposition and eggs/oviposition ratio were recorded over twelve months so as to obtain information on the number of egg-masses per animal and the number of eggs per egg-mass, as also the number of hatched eggs per egg-mass for each period of 30 days, i.e., the hatching-rate per period. The incubation period was about the same for both species, but the oviposition and egg oviposition ratio were greater in B. tenagophila.
authors.affiliation: Laboratório de Malacologia da Superintendência de Controle de Endemias (SUCEN), São Paulo, Brasil.
authors.forename: M R
authors.initials: MR
authors.lastname: Elmor
authors.forename: J F
authors.initials: JF
authors.lastname: Vaz
authors.forename: L M
authors.initials: LM
authors.lastname: Gonçalves
mesh_terms: D000818:Animals; D001700:Biomphalaria / Q000145:classification / Q000196:embryology / Q000502:physiology*; D005298:Fertility; D007753:Laboratories; D013997:Time Factors
vernacular_title: Contribuição ao estudo da biologia de Biomphalaria occidentalis Paraense, 1981 e de Biomphalaria tenagophila (d'Orbigny, 1835), em condições de laboratorio.