Estudio comparado de la superficie dorsal de la lengua de Euphractini bonaerenses (Mammalia, Xenarthra).

CIUCCIO M.; ESTECONDO S.; CODÓN, S. M; CASANAVE E.B.

Tandil, Prov. Bs. As., Argentina (FCV-UNICEN)

Congreso; I Congreso internacional de las Sierras, X Congreso Argentino de Ciencias Morfológicas, 15 al 17 de marzo de 2006.; 2006

FCV-UNICEN, Soc. Arg. de cs. Morfológicas

COMPARATIVE STUDY OF THE LINGUAL DORSAL SURFACE IN EUPHRACTINI OF BUENOS AIRES PROVINCE (MAMMALIA, XENARTHRA)  ESTUDIO COMPARADO DE LA SUPERFICIE DORSAL DE LA LENGUA DE EUPHRACTINI BONAERENSES (MAMMALIA, XENARTHRA) Ciuccio M .; Estecondo S.; Codón S.M.; Casanave E.B. Cátedra de Fisiología Animal, Dpto. de Biología Bioquímica y Farmacia, Universidad Nacional del Sur (UNS). Bahía Blanca, Argentina. casanave@criba.edu.ar Different types of papillae are located on the dorsal mucosa of mammalian tongue: filiforms, fungiforms, foliated and circumvallated. They differ in shape, size and number between species, and their development degree could reflect food habits of certain species. The aim of this study is to compare the characteristics of lingual dorsal surface of three armadillo species from Buenos Aires Province: Zaedyus pichiy, Chaetophractus vellerosus y C. villosus, by scanning electron microscopy. Tissue was fixed in diluted Karnovsky solution and then processed with routine histological techniques. Observations of tongue surface were made using an Evo 40 XVP (Cambridge, England) scanning electron microscopy at 7 kV. Prominent conical filiform papillae are mainly in the anterior third of the tongue followed by fungiform papillae in less proportion. Fungiform papillae have visible taste pores on surface. Filiform branched papillae are numerous in the middle third of the tongue. Their branches vary in number between 3 and 5 in Z. pichiy and C. vellerosus, and between 3 and 9 in C. villosus. In the posterior third there are two circumvallated papillae, placed at both sides of the midline of the tongue and they are surrounded by a groove. Posterior to circumvallated papillae, the filiform papillae are smaller and scarce. The presence and distribution of filiform, fungiform and circumvallated papillae are similar between the studied armadillo species. Key words: Lingual papillae, Tongue, Armadillos, Scanning. This study is supported by SGCyT-UNS, PGI 24/B086