Ключевые слова: animal, animal themes, aquatic, carnivorous, creature, devonian, environment, evolution, extinct, extinction, fish, flippers, illustration, image, jawless, marine fish, nature, ocean, organism, palaeozoic era, paleoart, picture, prehistoric, prehistoric era, primeval, primitive, pteraspis, pteraspis rostrata, sea, sea life, small, swimming, undersea, underwater, vertebrate,