Some aspects of the natural history of the casque-headed tree frog Corythomantis greeningi Boulenger (Hylidae)

Corythomantis greeningi, a casque-headed tree frog, was studied in the fiel d and in captivity. This species belongs to a monotypic genus, and together with other species of anurans, possesses a differentiated head which is fl at, very rough and presenting cranial co-ossification with the skin. These are characteristics that are usually associated with phragmotic behaviour w hich is supposed to have a role in water saving and protection against pred ators. Observations were focused on the characteristics of the species whic h make it adapted to life in the Brazilian semi-arid ("caatinga"). Data abo ut the body and external anatomy of the head, integument morphology, life, reproduction, interest for sheltering and defense against desiccation is pr esented. Finally, it is proposed that adaptation of this species to the dry environment is probably the result of the synergism of a number of differe nt strategies against water loss, including phragmosis. (C) 1999 Editions s cientifiques et medicales Elsevier SAS.