La histología del rincosaurio (Diapsida, Archosauromorpha) anquilothecodonty
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Ver abstracta en PubMed
Resumen
Este resumen es generado por máquina.Los dientes de rincosaurio, que anteriormente se pensaba que eran simplemente fusionados (anquilosis), muestran tejidos de unión complejos similares a los mamíferos y los dinosaurios. Esto sugiere que los cambios evolutivos en el tiempo de mineralización, no la evolución convergente, explican la diversidad de adherencia dental en los vertebrados.
Área De La Ciencia
- Paleobiología
- Paleontología de los vertebrados
- Biología evolutiva
Sus Antecedentes
- La evolución de la conexión diente-mandíbula es clave para la paleobiología de los vertebrados.
- La fijación de los dientes de los arcosauromorfos varía, con gomfosis en los dinosaurios / cocodrilos y anquilosis en grupos relacionados.
- La comprensión de la fijación de dientes de arcosáuridos clarifica los cambios evolutivos.
Objetivo Del Estudio
- Analice la fijación de los dientes de los rincosaurios para comprender la evolución de la fijación de los dientes de los vertebrados.
- Investigar la naturaleza histológica de la unión de los dientes de los rincosaurios.
- Aclarar la homología de los tejidos de adherencia de los dientes a través de Archosauromorpha.
Principales Métodos
- Análisis histológico de tres especímenes de rincosaurio del Triásico Medio.
- Examen de las etapas de desarrollo del diente.
- Análisis comparativo de los tejidos de fijación de los dientes.
Principales Resultados
- Los dientes de rincosaurio exhiben anquilosis pero poseen fibras de Sharpey, cemento y hueso alveolar, similar a los tejidos de gomfosis.
- El "hueso esponjoso de fijación" en los rincosaurios comprende tejidos mineralizados similares a la gomfosis.
- La anquilosis en los rincosaurios es el resultado del crecimiento óseo alveolar que mineraliza el ligamento periodontal.
Conclusiones
- Los tejidos de unión de los dientes de los rincosaurios son homólogos a los de los mamíferos, los dinosaurios y los cocodrilos.
- Los cambios heterocrónicos en el tiempo de mineralización, no la evolución convergente, explican la evolución independiente de la gomfosis.
- Esta investigación refina nuestra comprensión de la evolución del apego dental en los archosauromorfos y otros amniotas.
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