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Richard- You could ask Q. Bone at Plymouth. We worked together on various pelagic tunicates and he did all the em work and would know how many cells there are in doliolids and larvaceans. Pyrosomes have the usual 7 rows (Mackie, G.O. and Q. Bone. 1978. Luminescence and ciliary control in Pyrosoma. Proc. Roy. Soc. B. 202: 483-495.) Interesting about Jaekelocarpus. George