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The ciliary feeding mechanism of the cyphonautes larva [Polyzoa Ectoprocta]

Published online by Cambridge University Press:  11 May 2009

D. Atkins
D. Atkins
Affiliation:
From the Plymouth Laboratory
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Extract

The cyphonautes larva found in certain ectoproct Polyzoa is considered to be most probably a primitive larval form, which has been lost in viviparous species, the larvae of which are degenerate in varying degree and settle within a short time. The cyphonautes is truly planktonic and has a free swimming Life of some length—of 2 months according to Marcus (1940, p. 334)—and unlike the other known larvae of the group, has a functional alimentary canal. It obtains its food by maintaining a continuous current of water through the mantle cavity or vestibule, its ciliary mechanism being organized on a plan somewhat resembling that of bivalve molluscs, with an inhalant and an exhalant chamber with interposed ciliary ridges bearing current-producing and food-conveying cilia. As in lamellibranchs the organ creating the water and food currents is separated by a considerable interval from the mouth. In lamellibranchs this interval is bridged by the palps and the oral grooves; in the cyphonautes by the ciliated tract of the funnel. The cyphonautes being a larval form of probably archaic character its method of feeding is of particular interest.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 34 , Issue 3 , October 1955 , pp. 451 - 466
Copyright
Copyright © Marine Biological Association of the United Kingdom 1955

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