Observations on the immatures of Dasyhelea necrophila Spinelli & Rodriguez in laboratory. (Diptera: Ceratopogonidae)

RONDEROS, M. M., SPINELLI, G. R. & DIAZ FLORENTINA

TRANSACTIONS OF THE AMERICAN ENTOMOLOGICAL SOCIETY

Año: 2006 vol. 132 p. 291 - 297

0002-8320

Data obteined from observations in the laboratory on the morphology and biology of immatures of Dasyhelea necrophila Spinelli & Rodriguez are provided. Eggs and larvae were collected from containers with rain water and organic matter in Gonnet, La Plata, Argentina. The C-shaped eggs were able to ressit desiccations of aproximately 48 hours. Hytrated eggs developed in 7-10 days and the emerging larvae (instar I) remaind immobile during 30 minutes. The first molt took palce inside the eggs exposed to drought`periods. These eggs started to break when rehydrated and after 24 hours larvae II were born. Larva I showed positive phototropism and due to the fact that the proccesses of the last segment are still internal, its hardly moved. The pupa did not show any changes when  placed under artificial light and remained immobile for short periods at the bottom of the glass tube. The larva in their different instars and the pupa incresed mobily with the increase of temperature.