Gemuendina stuertzi, ray-like Placoderm Stegosaurus the shell consisted of a

the shell consisted of a series of chambers

Time period: Throughout the Pleistocene

and few museum replicas are more beautiful or intriguing than the Berlin specimen of Archaeopteryx

so it may represent an entirely new kind of dinosaur

All Arthropods have a chitinous exoskeleton and jointed limbs

Gemuendina stuertzi, ray-like Placoderm Stegosaurus the shell consisted of aGemuendina stuertzi is a placoderm of the order Rhenanida, of the seas of Early Devonian Germany. In life, Gemuendina resembled a scaly ray with an upturned head, or a large finned stargazer. G. stuertzi is often invoked as an example of convergent evolution with its flat body and huge, wing like pectoral fins it has a strong, albeit superficial similarity to rays. Unlike rays, however, both Gemuendina`s eyes and nostrils were placed atop the head,