This picture is Halocynthia roretzi cultured in Mutsu-bay, Aomori, Japan. Phylogeny Ascidian is a member of phylum Chordata.
Ascidian larvae have notochord, muscle, spinal cord in the tail region.
Ascidian embryo is a popular material of Developmental Biology. Various Ascidian Species Ascidian species collected in the vicinity of Asamushi Marine Biological Station. Halocynthia roretzi collected at Ookuno-jima, Setonaikai, Hisoshima, Japan. White one is an albino individual. Ciona savignyi collected at Asamushi, Aomori, Japan.