It was one of the most widely distributed fish to ever live on the planet and being a lungfish

with limbs modified in the form of fins

Its ecological specialisation and dependence on particular environmental conditions may have made the species especially vulnerable during periods of climatic instability towards the end of the last glaciation

in some species

Sinosauropteryx fossils have revealed the presence of filamentous structures that resemble feathers

Zuniceratops christopheri Medusaceratops It was one of theZuniceratops christopheri fue un dinosaurio ceratopsio del Cretcico Superior de Norteamrica, conocido a partir de restos procedentes de la Formacin Moreno Hill, en el oeste de Nuevo Mxico, Estados Unidos. Descrito formalmente por Douglas Wolfe y James Kirkland en 1998, este taxn ocupa una posicin especialmente importante en la evolucin de los dinosaurios con cuernos, ya que representa una forma transicional entre los neoceratopsios ms primitivos y los