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n.1.(Zool.) The free-swimming, bivalve larva of certain Bryozoa.
References in periodicals archive ?
The body plan of the cyphonautes larva of bryozoans prevents high clearance rates: comparison with the pluteus and a growth model.
In summer, these included cladocera and gastropods (primarily the pteropod Limacina helicina); in autumn, they included large calanoids, bryozoan cyphonautes larvae, and gastropods (Table 1, Fig.
Cladocera were present only in summer and cyphonautes only in autumn.
To examine this hypothesis, I studied the response of cyphonautes larvae of Membranipora membranacea to flow and their exploratory behavior under flow conditions.
Experiments were conducted in a simple flow tank to assess the response of settling cyphonautes larvae to shear flow and their behavior in different boundary-layer flow conditions.
However, ectoproct coronate and cyphonautes larvae show some interphyletic variety and may either have one pair of serotonergic cells in the apical organ or a nerve ring, or both (Pires and Woollacott, 1997; Shimizu et al, 2000; Wanninger et al.
A variety of bryozoan cyphonautes larvae and polychaete setigers were found irregularly.
Membranipora membranacea (Superfamily Membraniporoidea): Feeding Cyphonautes Larva
Versatile ciliary behaviour in capture of particles by the bryozoan cyphonautes larva.
In contrast, maternal zooids in species of Membranipora and Electra, as well as some species of Alcyonidium, Farella, and Hypophorella, produce many small, yolk-poor oocytes that are spawned into the water column, where they develop into planktotrophic cyphonautes.
An analogous situation has been described for the cyphonautes larva of bryozoans, in which ciliated band length does not increase proportionately to body volume during growth and development (McEdward and Strathmann, 1987).
A second hypothesis is that particles are halted by a sieve formed by stationary laterofrontal cilia, as observed for the cyphonautes larva of bryozoans (Strathmann and McEdward, 1986).