Classification of Subphylum Acrania | Zoology
In this article we will discuss about the classification of subphylum acrania. 1. Lack distinct head, cranium, brain, eyes, auditory organs and jaws. 2. The nerve cord is dorsal and hollow. 3. Notochord persistent and extends along the whole length of the body. 4. Gill slits numerous and open in the atrium. 5. Blood vascular system and nervous system resemble [...]