Search:tunicata -> TUNICATA
tunicata
t u n i c a t a hex:#116;#117;#110;#105;#99;#97;#116;#97;
The Salt of the World?
- Tunicata - n. pl. - A grand division of the animal kingdom, intermediate, in some respects, between the invertebrates and vertebrates, and by some writers united with the latter. They were formerly classed with acephalous mollusks. The body is usually covered with a firm external tunic, consisting in part of cellulose, and having two openings, one for the entrance and one for the exit of water. The pharynx is usually dilated in the form of a sac, pierced by several series of ciliated slits, and serves as a gill.
- Pharyngopneusta - n. pl. - A group of invertebrates including the Tunicata and Enteropneusta.
- Tethyodea - n. pl. - A division of Tunicata including the common attached ascidians, both simple and compound. Called also Tethioidea.
- Desmomyaria - n. pl. - The division of Tunicata which includes the Salpae. See Salpa.
- Thaliacea - n. pl. - A division of Tunicata comprising the free-swimming species, such as Salpa and Doliolum.
- Nucleus - n. - A visceral mass, containing the stomach and other organs, in Tunicata and some mollusks.