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Axial Organ and Fluid Circulation in Echinoids

Abstract

THE axial organ has long been one of the most enigmatical structures in echinoderms. That of echinoids has been considered excretory1–4, genital5, vestigial6, as producing pigment7 and as a circulatory organ8–17.

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MILLOTT, N., VEVERS, H. Axial Organ and Fluid Circulation in Echinoids. Nature 204, 1216–1217 (1964). https://doi.org/10.1038/2041216a0

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