Acta Parasitologica, Vol. 52, No. 4, 2007,
Fernanda Zanca (1, 2), Cristina De Villalobos (1, 3)* and Alejandra Rumi (1, 2)
Larval survival strategy during winter of Chordodes nobilii Camerano, 1901 (Gordiida, Nematomorpha)
(1) Facultad de Ciencias Naturales y Museo Universidad Nacional de La Plata, Paseo del Bosque S/N, 1900 La Plata; (2) Consejo Nacional de Investigaciones Científicas y Técnicas Av. Rivadavia 1917 CP C1033AAJ Ciudad de Buenos Aires; (3) Comisión de Investigaciones Científicas de la Provincia de Buenos Aires 526 e/10 y 11; Argentina
are numerous open questions concerning the life cycle of Gordiida (Nematomorpha), especially about egg development and viability of larvae during winter, when the temperature of freshwater environments where they inhabit is low.
On the basis of experimental studies we demonstrate that egg development of Chordodes nobilii takes 2025 days at 22°C and 4555 days at 5°C.
We also observed that larvae of C. nobilii obtained from egg strings at 5°C and maintained at that temperature during six months remained inside their egg shells as a survival strategy.
Nematomorpha, Chordodes nobilii, temperature, larvae survival