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| 1. |
Why urochordates are called tunicates |
| Answer» Tunicates\xa0are\xa0considered\xa0acraniate\xa0chordates\xa0because\xa0tunicates\xa0and\xa0chordates\xa0have the following features in common: a notochord; a dorsal, hollow nerve cord; and pharyngeal gill slits at some time in their lives. In vertebrates, the nerve cord becomes the spinal cord and brain.\xa0The name\xa0tunicates\xa0come from the tunic surrounding their body. The name sea squirt comes from the way water is pushed out through the exhalant siphon. ... On the inside of the epidermis are a thicker dermis (body wall) and bands of muscles which can squeeze the tunic forcing a jet of water from the exhalant siphon. | |