Tag Archives | Classification of Urochordata

Urochordata includes about 2000 fixed and 100 pelagic species. It has been divided into the following three classes: Class 1. Larvacea (Appendicularia): 1. Small (5 mm long solitary) free-swimming pelagic forms. 2. Neotenic forms which retain the larval form throughout adult life with persistent tail, nerve cord, notochord. 3. Test is temporary and renewed periodically. 4. Single pair of gill-slits [...]