1) Aplysiidae 2) Family aplysiidae 3) Family tethyidae 4) Mollusk family 1) Aplysiidae 
Tethyidae is a family of demosponges belonging to the order Hadromerida. Tethyidae at Encyclopedia of Life ...
(from the article `nudibranch`) Nudibranchs occur in the shallow waters of all the world`s oceans, where they feed chiefly on other invertebrates, particularly sea anemones. Those ... ...NudibranchiaSea slugs without shell, mantle cavity, osphradium, or internal gill; many feed on sessile animals; few swimmers (family Tethyidae); ... ...