The Collaborative International Dictionary of English v.0.48:

Larvalia \Lar*va"li*a\, prop. n. pl. [NL. See Larval.] (Zool.)
   An order of Tunicata, including Appendicularia, and allied
   genera; -- so called because certain larval features are
   retained by them through life. Called also Copelata. See
   Appendicularia.
   [1913 Webster]