Ascidioidea

As·cid·i·oid·e·a

Ascidioidea

n. pl.
  1. A group of Tunicata, often shaped like a two-necked bottle. The group includes, social, and compound species. The gill is a netlike structure within the oral aperture. The integument is usually leathery in texture. See Illustration in Appendix. (Zool.)