thaliacea(n = noun.animal) class thaliacea - small class of free-swimming tunicates; sometimes classified as an order;
is a kind of class
is a member of subphylum tunicata, subphylum urochorda, subphylum urochordata, tunicata, urochorda, urochordata
A division of Tunicata comprising the free-swimming species, such as Salpa and Doliolum. [1913 Webster]