By W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.)
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Extra info for Advances in Parasitology, Vol. 19
I have seen infective females of Lernaeocera branchialis attempting, on contact, to grasp, with their second antennae, the wall of the cavity in a glass slide. Sproston (1942) commented on such juveniles of the same species attaching themselves to empty egg-strings of mature females, and even to artifacts. Here again the mechanisms involved remain completely unknown. It is not unreasonable to suspect that initial contact, by whatever means effected, is followed by definitive recognition, and acceptance or rejection, of the host.
Depending on the location of these sites (superficial or internal), they have been traditionally classified as ecto- or endoparasites. The overwhelming majority of copepods fall within the former category, but endoparasitic copepods are far from rare. Their true abundance remains unknown at present and tends to be underestimated, simply because of their generally small size, and because their secretion within the tissues of the host renders them difficult to detect. Specific search for endoparasitic copepods often reveals them in unexpectedly large numbers, as witnessed by the work of Richiardi on Colobomatidae in the latter part of the nineteenth century (see Kabata, 1979).
A life cycle with a pattern unusual among copepods parasitic on fishes is 24 2. K A B A T A exemplified by Pennellidae (Fig. 5G). Two free-living nauplius stages are followed by the infective copepodid and four chalimus stages. In the latter, this type resembles the life cycle of the non-clavellid Lernaeopodidae (Fig. 5E). The resemblance ends, however, when chalimus IV moults into another free-living stage, an infective preadult, which seeks out the second and definitive host of the cycle. g. g.
Advances in Parasitology, Vol. 19 by W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.)