The Collaborative International Dictionary of English v.0.48:
Larvacea \Larvacea\ prop. n. A class sometimes classified as an order. Syn: class Larvacea. [WordNet 1.5]WordNet (r) 3.0 (2006):
Larvacea n 1: small free-swimming tunicates; sometimes classified as an order [syn: Larvacea, class Larvacea]