Newly hatched Australian lungfish, Neoceratodus forsteri KrefFt, develop a ciliary current over the skin surface which continues for more than six weeks of larval life. The gill surface under the opercula also becomes ciliated. The ciliary cells producing the current are found to develop in like manner to those in several amphibian embryos and larvae. The long duration of ciliary currents in one of the most primitive living gnathostomes has ontogenetic and phylogenetic implications.
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Whiting et al. (1980) studied this question.
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