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Larval survival strategy during winter of Chordodes nobilii Camerano, 1901 [Gordiida, Nematomorpha]

100%

Zanca F. , De Villalobos C. , Rumi A.

nr 4

There 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 20–25 days at 22°C and 45–55 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.

The occurrence of epibionts of Gordiida [Nematomorpha] in Catamarca, Argentina

88%

De V. C. , Salas L. , Zanca F. , Atencio A.

tom 55

nr 3

281-285

The presence of larvae and pupae of the genus Metrichia (Trichoptera, Hydroptilidae), larvae of the genus Macrelmis and Phanocerus (Coleoptera, Elmidae), three diatom genera Achnanthes, Cocconeis, Gomphonema, and some specimens of very small diatoms that could not be determined to species or genus level, were recorded for the first time as epibionts for Chordodes brasiliensis (Gordiida, Nematomorpha). Such epibionts were found on the body surface of this species of hairworms, captured from El Tala stream, Catamarca, Argentina.