Miocene Edentata Xenarthra of La Venta (Colombia) I Dasypodoidea and Glyptodontoidea
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Universidad Industrial de Santander
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Entre la abundante fauna miocénica de La Venta (Colombia) cabe destacar la presencia de desdentados. En estetrabajo se tratan solamenre los Dasypodoidea y los Glyptodontoidea que estan representados respectivamente por Kraglievichia paranensis (Ameghino), Asterostemma cf. venezolensis Simpson y Propalaehoplophorus sp. Estas formas se hallan distribuídas por casi todos los niveles estratigráficos que se han señalado en los 700 m de espesor que forman parte del Grupo Honda en La Venta (Stirton, 1953 y Fields, 1959). La morfología y talla de las placasson caracteres variables individualmente y en relación con la posición dentro del caparazón. La existencia de una variación gradual en estos caracteres dificulta la separación entre géneros y especies cuando se trata de placas aisladas. La validez de algunos géneros creados con base en las placas no es muy segura. Todo parece indicar que se ha realizado una pulverización excesiva y que se impone una revisión de estas familias.
In the abundant Míocenic faune of "La Venta" (Colombia) it is Important to bring out the presence of Edentates. In this work only are discussed the Dasypodoidea and the Glyptodontoidea respectively represented by Kraglievichia pararlensis (Ameghino), Asterostemma eI. venezolensis Simpson and Propalaehoplophorus sp. These forms are found in almost the whole 700 metres thickness stratigraphic levels of the Croup Honda in La Venta (Stirton, 1953 y Fields, 1959). The morphology and size of the plates are individually variable characters related to the position inside the carapace. The existence of a gradual variation in these characters difficult the separation among genres and species when dealing with isolted plates. The validity of some genres based in the plates is questionable. It looks like and excessive grinding was produced and it is necessary a review of these families.
In the abundant Míocenic faune of "La Venta" (Colombia) it is Important to bring out the presence of Edentates. In this work only are discussed the Dasypodoidea and the Glyptodontoidea respectively represented by Kraglievichia pararlensis (Ameghino), Asterostemma eI. venezolensis Simpson and Propalaehoplophorus sp. These forms are found in almost the whole 700 metres thickness stratigraphic levels of the Croup Honda in La Venta (Stirton, 1953 y Fields, 1959). The morphology and size of the plates are individually variable characters related to the position inside the carapace. The existence of a gradual variation in these characters difficult the separation among genres and species when dealing with isolted plates. The validity of some genres based in the plates is questionable. It looks like and excessive grinding was produced and it is necessary a review of these families.