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|Noun||1.||Ascidiaceae - sometimes classified as an order: sea squirts|
subphylum Tunicata, subphylum Urochorda, subphylum Urochordata, Tunicata, Urochorda, Urochordata - tunicates
ascidian - minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves
ascidian tadpole - free-swimming larva of ascidians; they have a tail like a tadpole that contains the notochord
class - (biology) a taxonomic group containing one or more orders