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All Arthropods have a chitinous exoskeleton and jointed limbs
the subject of this paper
About 125 million years ago
The white circle on the image at right shows the region of the eggs
Gemuendina stuertzi, ray-like Placoderm Stegosaurus All Arthropods have a chitinousGemuendina 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,
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