any member of the invertebrate class Ascidiacea (subphylum Urochordata, also called Tunicata), marine animals with some primitive vertebrate ... [8 related articles] Found on http://www.britannica.com/eb/a-z/s/52
Any solitary or colonial-dwelling saclike chordate of the class Ascidiacea. A pouch-shaped animal attached to a rock or other base, it draws in food-carrying water through one siphon and expels it through another after straining it through numerous gill slits. The young are free-swimming tadpole-shaped organisms, which, unlike t... Found on https://www.encyclo.co.uk/local/21221