Protonephridia form an excretory system, like the flame bulb system in flatworms, comprising tubules without internal openings.
I protonefridi sono un sistema escretore, come il sistema a bulbo di fiamma dei platelminti, costituito da una rete di tubuli senza aperture interne.
Front | protonephridia |
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Back | An excretory system, such as the flame bulb system of flatworms, consisting of a network of tubules lacking internal openings. |
Tags: ch.44
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