eurypterids swimming in a pack

ancient animal arachnids arthropod arthropods background claws compound devonian era eurypterid eurypterids eurypterus exoskeleton extinct eyes formidable fossil illustration insect lakes large largest late life million nature ocean ordovician painting paleontology permian pincers predators prehistoric prey related remipes science scorpion scorpions sea search seas shallow texture thrived together traveling triassic trilobite underwater warm water wildlife years zoology