CLASSIFICATION: LARVACEA-APPENDICULARIANS-STRUCTURE, ETC.-ASCIDIACEA-
SIMPLE ASCIDIANS-SPECIFIC CHARACTERS-COMPOUND ASCIDIANS-GEMMATION-
MEROSOMATA-HOLOSOMATA-PYROSOMATIDAE-THALIACEA-DOLIOLIDAE-
SALPIDAE-GENERAL CONCLUSIONS-PHYLOGENY 63
CEPHALOCHORDATA