IDEAUS - CENPAT   25626
INSTITUTO DE DIVERSIDAD Y EVOLUCION AUSTRAL
Unidad Ejecutora - UE
artículos
Título:
Ontogenetic changes in eye development of Pleurodema bufoninum and Pleurodema somuncurense
Autor/es:
VOLONTERI MC; BASSO NG; BARRASSO DA; HERMIDA GN; COTICHELLI L
Revista:
JOURNAL OF MORPHOLOGY
Editorial:
WILEY-LISS, DIV JOHN WILEY & SONS INC
Referencias:
Lugar: New York; Año: 2017 vol. 278 p. 896 - 906
ISSN:
0362-2525
Resumen:
Vision is one of the mean sensory systems in amphibians and the eye structure is highly associated to habitat conditions. Its ontogeny as well as the adult structure was studied only in a few species. Life change after metamorphosis is accomplished by changes in visual environment. The aim of this work is to describe the eye ontogeny of Pleurodema bufoninum and to compare it with Pleurodema somuncurense. Specimens of both Pleurodema species were processed for histology analysis at different stages of development, including tadpoles, post-metamorphic and adult forms. Eyes in both Pleurodema species are composed by the 3 tunics: tunica fibrosa, tunica vasculosa and tunica interna, and the lens. Also, in both of them the iris presents a projection on its dorsal and ventral free ends that screens the cornea. This structure was reported in the eye of a few anuran species and was named as umbraculum, meniscus or pupillary nodule. Our results show that those structures related to light caption (retina and lens) appear early in larval life, while those components of terrestrial life eye (scleral cartilage, specialized cornea, eyelids, nictitating membrane and Harderian´s gland) do not develop until the metamorphic climax, when the tadpole leaves the water. The adult eye of P. bufoninum and P. somuncurense are very similar in structures and development.