Dinosaurios y su definición

Los dinosaurios (denominación científica Dinosauria, del griego Deinos + Saurus, "lagartos terribles") son un grupo de animales vertebrados que dominaron los ecosistemas del mesozoico durante unos 160 millones de años alcanzando una gran diversidad y tamaños gigantescos. Una de sus principales características distinguibles fue que poseían las patas situadas por debajo del cuerpo, como los mamíferos, y no hacia los costados, como la mayor parte de los reptiles. Durante los últimos años se han acumulado pruebas científicas muy contundentes de que pequeños dinosaurios carnívoros dieron origen a las aves durante el periodo Jurásico. De ahí que, actualmente, las aves estén clasificadas dentro de Dinosauria. Los dinosaurios se confunden frecuentemente con otros tipos de reptiles antiguos, como los alados pterosaurios, los terápsidos pelicosaurios y los acuáticos ictiosaurios, plesiosaurios, y mosasaurios, aunque ninguno de estos era realmente dinosaurio.

Dinosauria constituye un superorden de la clase de los arcosaurios. Se considera que forman un grupo taxonómico por presentar una serie de claras sinapomorfias que los unen, como el fémur articulado con la pelvis por medio de cóndilo, dispuesto en ángulo respecto de aquél, y hueco en la pelvis. Se trata de la misma disposición que se presenta en los mamíferos, y que permite que las patas traseras sostengan al cuerpo actuando como pilares, lo que repercute decisivamente en la habilidad motriz. Los dinosaurios se clasifican tradicionalmente según la estructura de su cadera.

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