Urochordates, commonly known as sea squirts have a larval stage that resembles a chordate.
What are Urochordates? Give the characteristics of it.
Ascidians (sea squirts) are a common term for the Urochordata, also known as the Tunicata. The body of an adult tunicate is fairly simple. While possessing all the characteristics of a chordate, including a notochord, a dorsal nerve cord, pharyngeal slits, and the larva of many tunicates swims freely and lacks only these characteristics. Ascidia, Salpa, and Doliolum, for instance.
Characteristics features of Urochordata:
1. The grownups are anchored to the foundation.
2. It is also known as "Tunicate" because an adult's body is covered by a tunic formed of tunicin, a cellulose-like substance.
3. The notochord only appears in the larval stage and vanishes in the adult.
4. In adults, a dorsal ganglion takes the role of the nerve cord that is present in the larva.
5. The larva can migrate and changes into a different animal.
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