BIOL 2030 Lecture Notes - Thaliacea, Chordate, Subphylum

• School: York University
• Department: Biology
• Course: BIOL 2030
• Professor: Scott Kelly

Document Summary

Chordata phylum of coelomate animals having a notochord and gill clefts in the pharynx at some. Urochordata point in their life history, and a hollow nerve cord running dorsally, with the anterior end usually dilated to form a brain. The chordates include the vertebrates, the cephalochordates, and the urochordates. [tunicata] subphylum of chordates containing the classes ascidiacea, and the thaliacea; Chordate features are found only in the larva and are generally lost in the adult. The adult secretes a tough cellulose sac (tunic) in which the animal is embedded. Cephalochordata subphylum of small cigar-shaped aquatic chordates commonly called lancets and including amphioxus. They have a persistent notochord in the adult and a large sac-like pharynx with gill slits for food collection and respiration. Vertebrata subphylum of chordata, animals characterized by the possession of a brain enclosed in a skull, ears, kidneys and other organs, and a well-formed bony or cartilageous vertebral column or backbone enclosing the spinal cord.