from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. A taxonomic subphylum within the phylum Chordata — the tunicates or sea squirts.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. tunicates
In the two other subphyla of the chordates, Cephalochordata and Urochordata, the notochord is either maintained in the adult (Cephalochordata such as Lancelets) or present in the larval form and lost during metamorphosis into the adult form (Urochordata such as Tunicates).
Tunicates (Urochordata) do not have a closed circulatory system, only craniates have the first epithelial ducts that transport oxygen to the locomotion and digestive system-related muscles.
Urochordata! "as well as a good bit of its content, is drawn from my love of tunicates.