INVESTIGADORES
VOLPEDO Alejandra Vanina
artículos
Título:
Notas sobre cráneo, otolitos y biología de Lepidosiren paradoxa (PISCES, DIPNOI).
Autor/es:
GONZALEZ NAYA, MARÍA JIMENA; VOLPEDO, ALEJANDRA VANINA; GOMEZ, SERGIO; CARIGNANO, LAURA; SANCHEZ, MARÍA VICTORIA
Revista:
Biologia Acuática
Editorial:
ILPLA - Instituto de Limnología "Dr. Raúl A. Ringuelet"
Referencias:
Lugar: La Plata, Buenos Aires, Argentina; Año: 2008 vol. 24 p. 21 - 26
ISSN:
0326-1638
Resumen:
Lungfishes are a singular group of Sarcopterygii which in the Neotropics is
represented by Lepidosiren paradoxa. They present anatomical and physiological features that
allow them to survive under adverse conditions. Here we described and illustrated the
otoliths and determinate their composition. L. paradoxa skull is also described and illustrated
with emphasis in the jaw morphology. This skull was compared with the skull of the other
extant lungfishes Neoceratodus (Australian lungfish) and Protopterus (African lungfish).
Experimental observations were included on the behavior in aquarium and on the
construction of galleries under laboratory conditions. L. paradoxa otoliths presented
subcircular shape with a convex internal face, a narrow sulcus of regular edges, marginal
and parallel to the dorsal edge. The external face presented calcareous concretions and
heterogeneously distributed undulations. The otholit chemical composition differs from most
of marine and freshwater teleost, but resembles to other dipnoos. The skull streamlined
presents numerous bones fusions in the occipital and parietal region and exhibits a significant
sagital crest. The jaw suspension showed fusion of superior jaw with the skull. Both jaws
have dental plates with prominent crests. The distance between the first and the second
crest in the inferior jaw increases in relation to total length. Overall, skull and otolith showed
great similarities with the African genusLepidosiren paradoxa. They present anatomical and physiological features that
allow them to survive under adverse conditions. Here we described and illustrated the
otoliths and determinate their composition. L. paradoxa skull is also described and illustrated
with emphasis in the jaw morphology. This skull was compared with the skull of the other
extant lungfishes Neoceratodus (Australian lungfish) and Protopterus (African lungfish).
Experimental observations were included on the behavior in aquarium and on the
construction of galleries under laboratory conditions. L. paradoxa otoliths presented
subcircular shape with a convex internal face, a narrow sulcus of regular edges, marginal
and parallel to the dorsal edge. The external face presented calcareous concretions and
heterogeneously distributed undulations. The otholit chemical composition differs from most
of marine and freshwater teleost, but resembles to other dipnoos. The skull streamlined
presents numerous bones fusions in the occipital and parietal region and exhibits a significant
sagital crest. The jaw suspension showed fusion of superior jaw with the skull. Both jaws
have dental plates with prominent crests. The distance between the first and the second
crest in the inferior jaw increases in relation to total length. Overall, skull and otolith showed
great similarities with the African genusL. paradoxa skull is also described and illustrated
with emphasis in the jaw morphology. This skull was compared with the skull of the other
extant lungfishes Neoceratodus (Australian lungfish) and Protopterus (African lungfish).
Experimental observations were included on the behavior in aquarium and on the
construction of galleries under laboratory conditions. L. paradoxa otoliths presented
subcircular shape with a convex internal face, a narrow sulcus of regular edges, marginal
and parallel to the dorsal edge. The external face presented calcareous concretions and
heterogeneously distributed undulations. The otholit chemical composition differs from most
of marine and freshwater teleost, but resembles to other dipnoos. The skull streamlined
presents numerous bones fusions in the occipital and parietal region and exhibits a significant
sagital crest. The jaw suspension showed fusion of superior jaw with the skull. Both jaws
have dental plates with prominent crests. The distance between the first and the second
crest in the inferior jaw increases in relation to total length. Overall, skull and otolith showed
great similarities with the African genusNeoceratodus (Australian lungfish) and Protopterus (African lungfish).
Experimental observations were included on the behavior in aquarium and on the
construction of galleries under laboratory conditions. L. paradoxa otoliths presented
subcircular shape with a convex internal face, a narrow sulcus of regular edges, marginal
and parallel to the dorsal edge. The external face presented calcareous concretions and
heterogeneously distributed undulations. The otholit chemical composition differs from most
of marine and freshwater teleost, but resembles to other dipnoos. The skull streamlined
presents numerous bones fusions in the occipital and parietal region and exhibits a significant
sagital crest. The jaw suspension showed fusion of superior jaw with the skull. Both jaws
have dental plates with prominent crests. The distance between the first and the second
crest in the inferior jaw increases in relation to total length. Overall, skull and otolith showed
great similarities with the African genusL. paradoxa otoliths presented
subcircular shape with a convex internal face, a narrow sulcus of regular edges, marginal
and parallel to the dorsal edge. The external face presented calcareous concretions and
heterogeneously distributed undulations. The otholit chemical composition differs from most
of marine and freshwater teleost, but resembles to other dipnoos. The skull streamlined
presents numerous bones fusions in the occipital and parietal region and exhibits a significant
sagital crest. The jaw suspension showed fusion of superior jaw with the skull. Both jaws
have dental plates with prominent crests. The distance between the first and the second
crest in the inferior jaw increases in relation to total length. Overall, skull and otolith showed
great similarities with the African genus