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the subject of this paper
All Arthropods have a chitinous exoskeleton and jointed limbs
The find consisted of upper and lower teeth belonging to a single individual specimen with the largest tooth reaching 6 inches in length
Gemuendina stuertzi, ray-like Placoderm Stegosaurus 000 poundsGemuendina 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,