Resumen

KOBELKOWSKY, Abraham. Skeleton and dentition of the lamprey of Chapala, Lampetra spadicea (Petromyzontidae). Hidrobiológica [online]. 2005, vol.15, n.2, pp.151-159. ISSN 0188-8897.

The skeleton of the lamprey of Chapala, Lampetra spadicea fits in the morphological pattern of the Petromyzontiformes, as that of the lampreys from the Pennsylvanian. As primitive characters of L. spadicea are noticeably the maintenance of the notocord, the presence of remains of neural arches, and the incomplete neurocranium. While the structure of the neurocranium of L. spadicea and the rest of Petromyzontiformes has a primitive condition, similar to that of the Osteostraci from the Silurian, the rest of the cephalic skeleton and musculature is specialized in the parasitic feeding. The velar and infravelar plate are recognized as the most important place for muscle insertion. The teeth arrangement of this lamprey is the same described by other authors.

Palabras llave : Lamprey; skeleton; teeth; Lake of Chapala; México.

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