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Observations with the scanning electron microscope on a filamentous bacterium present on the aesthetasc setae of the brown shrimp Crangon crangon (L.)

In a previous paper, (Shelton, 1974) it was shown that the antennules and some other appendages of certain field and laboratory populations of the brown shrimp, Crangon crangon (L.), may become colonized by a filamentous organism tentatively identified as a blue-green alga. Other workers (Johnson et al., 1971) have described similar growths on benthic Crustacea, fish eggs and algae (Bland & Brock, 1973) and have identified the epizooic organism as Leucothrix mucor Oersted (Harold & Stanier, 1955), a filamentous, heterotrophic bacterium, common in the intertidal zone.