A small species of scale worm chooses to make its home inside a carnivorous sponge ... Sponges are sessile animals within the phylum Porifera. There are over 9,000 known species of sponge living in ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Name: Antarctic scale worm (Eulagisca gigantea) Where it lives: Below 1,640 (500 meters) deep in ...