Revista de Saúde Pública
On-line version ISSN 1518-8787
KAWAZOE, Urara. Some angles of the biology of Biomphalaria glabrata (Say, 1818) and Biomphalaria tenagophila (D'Orbigny, 1835) (Pulmonata, Planorbidae): I. Duration of the embryo period. Rev. Saúde Pública [online]. 1976, vol.10, n.1, pp. 57-64. ISSN 1518-8787. http://dx.doi.org/10.1590/S0034-89101976000100005.
The incubation periods of Biomphalaria glabrata and Biomphalaria tenagophila were compared during one year, in the laboratory. The average time for eggs hatching was 7,6 and 8,0 days for Biomphalaria glabrata and Biomphalaria tenagophila, respectively; the difference was not significant at the 5% level. The fastest development of the eggs was verified in the summer when the average water temperature was approximately 28°C. The analysis of the correlation coeficient showed that the influence of temperature on the egg development period was not strong: Biomphalaria glabrata showed best correlation with minimum air temperature (36,2%) and with water temperature (36,0%), while Biomphalaria tenagophila correlated best with minimum air temperature (27,0%).
Keywords : Planorbidae biology; Biomphalaria glabrata; Biomphalaria tenagophila; Schistosomiasis mansoni.