References for Pyrosoma atlanticum:

Burighel P. Martinucci G.B. Lane N.J. and Dallai R. (1992) Junctional complexes of the branchia and gut of the tunicate, Pyrosoma atlanticum(Pyrosomatida, Thalicea). Cell Tissue Research 267:357-364

Godeaux, J. (1998) The Biology of Pelagic Tunicates. Bone Q, ed., pp 276-277