Two patterns of colonial water flow in an erect bilaminate bryozoan, the cheilostome Schizotheca serratimargo (Hincks, 1886)
Mc Kinney, F.K. (1989). Two patterns of colonial water flow in an erect bilaminate bryozoan, the cheilostome Schizotheca serratimargo (Hincks, 1886). Cah. Biol. Mar. 30(1): 35-48
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723; e-ISSN 2262-3094, more
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| Abstract |
The cheilostome bryozoan Schizotheca serratimargo grows in the northern Adriatic Sea predominantly as adeoniform bushes, less commonly as free, eschariform sheets. Zooids occupied by functioning polypides are commonly confined to the outer 15-20 mm of branch tips. Lophophores placed centrally along branches are equi-tentacled and radially symmetrical; within the 0.5 mm band along branch margins, lophophores become progressively larger, more inequi-tentacled, laterally elongated and supported on longer introverts out to the branch edge. These variations in lophophore parameters are related to the colonial pattern of feeding currents, which flow towards the flat branch surfaces, through lophophores, laterally in the space between lophophores and branch surface provided by the extended introverts, and out as a continuous narrow sheet along branch margins. Marginal outflow in the only eschariform sheet seen feeding is supplemented by outflow chimneys spaced regularly across the frond surface. |
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