By W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.)
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Extra info for Advances in Parasitology, Vol. 19
No difference between the arches was observed. Fryer (1968) found site preferences in Ergasilus flaccidus Fryer, 1965, E. latus Fryer, 1959 and E. kandti van Douve, 1912, all of which settle on the anterior halves of hemibranchs, always on the ventral half of the first three arches. Kabata and Cousens (1977) studied the attachment of Salmincola californiensis to the fry of Oncorhynchus nerka, and found that three out of four copepodids initially attached themselves to the areas not covered by scales (fins, fin bases).
Nothing is known of the mechanisms involved in this process, either, but one can speculate that chemoreception on the part of the copepod might be involved. I have suggested that, at least in Caligidae, chemoreception plays a very important role and that host selection is accomplished with the aid of a newly discovered organ (Kabata, 1974b). ” Its real purpose is suggested by its structure. The organ consists of numerous minuscule villiform papillae, packed closely in a well defined field and slightly recessed below the ventral surface of the cephalothorax.
2. Secondary ( i ) An example of a newly evolved structure is presented by the adhesion pads of Pandaridae (Siphonostomatoida). These pads, with rugose or transversely grooved surfaces, have developed on some previously existing appendages (second antenna, maxilliped, swimming legs), or on the ventral surface of the cephalothorax, and are associated with parasitism on elasmobranch PARASITIC COPEPODA : PROBLEMS A N D PERSPECTIVES 39 hosts. Possibly the shagreen texture of the skin of these fishes offers a particularly good adhesion surface for these pads.