Download Advances in Parasitology, Vol. 19 by W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.) PDF

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By W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.)

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There are no more moults and the pupa becomes an adult by continuous metamorphosis. Heegaard’s pupa can, therefore, be equated with the preadult, as defined here. 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.

It might be presumed that most, or all, members of the Clavella-branch of Lernaeopodidae have similar life cycles. Nectobrachia indivisa, not a member of this branch but sharing with its members the abbreviated condition of the male, shares with Clavella also the type of life cycle (Wilkes, 1966) (Fig. 5F). In this type of cycle, the single nauplius is free-swimming. It moults into a copepodid, which is the infective stage. ” There are no more moults and the pupa becomes an adult by continuous metamorphosis.

4F). Its buccal apparatus resembles that of Pennellidae in possessing an elaborate buccal tube; the first and second maxillae are also similar to those of Pennellidae and of several other families of parasitic siphonostomes. Neither the second antenna nor the maxilliped has developed into a prehensile appendage. The general structure is not unlike that of the free-swimming stages of many parasitic copepods. M . pleurospinosus must be included in any consideration of the phylogeny of Siphonostomatoida and of the origin of parasitism in this suborder.

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