hallucigenia, group of prehistoric aquatic animals from the cambrian period 3d paleoart

animal aquatic arthropod background biology biota cambrian creature early environment epoch era evolution explosion extinct extinction fauna form fortis fossil hallucigenia hongmeia illustration invertebrate life lobopodia lobopodian marine nature ocean organism paleoart paleontology paleozoic period prehistoric primeval primitive science small sparsa spines underwater velvet water wildlife worm xenusiid