Definitions for "Ascidians"
Animals from the Class Ascidiacea. These animals belong to the same Phylum Chordata as us vertebrates. Vertebrates belong to the Subphylum Vertebrata while ascidians belong to Subphylum Urochordata.
Included in the subphylum Urochordata and commonly known as sea squirts, ascidians look like a jug with two openings, an incurrent and excurrent siphon. Most grow attached to seafloor substrates.
Tunicate animals, including sea squirts and red bait.