By LASZLO ILYES from Cleveland, Ohio, USA (Lettuce Sea Slug) [CC-BY-2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
Aliens vs Animals. Neglected inspiration
Nematostella
By LASZLO ILYES from Cleveland, Ohio, USA (Lettuce Sea Slug) [CC-BY-2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons