| Description | Amphioxus t.s. through pharynx, Amphioxus t.s. through intestine, Amphioxus t.s. caudal region, Amphioxus w.m., Amphioxus t.s. tail, Ciona w.m., Herdmania spicules, Salpa w.m., Balanoglossus t.s. proboscis, Balanoglossus t.s. collar, Balanoglossus t.s. trunk, Balanoglossus anterior region l.s., Balanoglossus t.s. branchial region., Tornaria larva w. m., Ammocoetes larva branchial region t.s. |
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