Southward, E. C., 1975, Fine structure and phylogeny of the Pogonomorpha: Symposium of the Zoological Society, London, v. 36, p. 235-251.
Welsch, U., 1975, The fine structure of the pharynx, cryptopodocytes and digestive system of amphioxus (Branchiostoma lanceolatum): Symposium of the Zoological Society, London, v. 36, p. 17-41.
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