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A primitive chordate from the Burgess Shale
where teeth were absent in the upper jaw tip
Astephus antiquus is an extinct for of catfish found in the Green River Formation of Wyoming
Starfish have remained relatively unchanged throughout their 500-million-year history
however the differences can also be ascribed to the possible juvenile stage of the animal and/or a different feeding niche
Stegosaurus Dorsal Plate Protoceratops A primitive chordate from theNamed Stegosaurus, or "roof lizard" for it's large, flat dorsal plates, this herbivorous dinosaur is a classic favorite. Scientists debate the purpose of those trademark plates, but many suggest they were used to regulate heat. Filled with blood vessels, the plates could quickly warm the big plant eater when faced towards the sun. Stegosaurus sp. Late Jurassic (150 m. y. a.) Morrison Formation Cleveland Lloyd Quarry, Utah Shipping Included