- Body shows variation in size and form.
- The body is un segmented and has no tail.
- The body is covered by a test. It is formed by tunicine which is rallied to cellulose. Hence the name Tunicata.
- Body wall shows one-layered epidermis, dermis is made by connective tissue and muscles, and atrial epithehum.
- Celome is absent.
- Atrial cavity surrounds the pharynx, into this cavity the gill slits,anus and genital ducts will open. It opens through atrial aperture.
- Larva has notochord in the tail. It disappears during metamorphosis.
- Respiratory system contains gills in the pharyngeal wall.
- Ciliary mode of feeding is common.
- Open type of Circulatory system is seen.
- The heart is ventral and it periodically reverses its function.
- Nervous system is represented by a single dorsal ganglion in the adult.
- Excretion is carried on by nephrocytes.
- Asexual reproduction is by budding.
- Bisexual animal and cross fertilisation is favored.
- Fertilization is external.
- Development includes a minute, free swimming tadpole larva with a tail, a dorsal nerve cord, and a notochord in the tail. In some urochordates retrogressive metamorphosis is seen in the life history.
GENERAL CHARACTERS OF UROCHORDATAWritten by BS Media
- Also Read: GENERAL CHARACTERS OF CEPHALOCHORDATA