By W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.)
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Extra resources for Advances in Parasitology, Vol. 19
The general premise of increase in infection intensity and prevalence with the size of the host was supported by Cressey and Collette (1970) for the first group but not for the second. The authors attributed the difference between the two groups to the dependence of the specialized copepods on a limited attachment area, which increases with the size of the fish. The generalized copepods, capable of living anywhere on the body surface, suffer from no such restraint. Hence their numbers do not show an increase with the size of the host.
4D). The specimen shows many close similarities with modern Dichelesthium. Its first antenna, consisting of about 20 segments, is its most primitive feature, but the development of two pairs of prominent aliform expansions on the posterior part of the body is an advanced morphological feature, absent from Dichelesthium. ) The discovery of this, as yet nameless, fossil copepod greatly extends the time range of parasitic copepods, and of copepods in general. It also suggests that many parasitic copepods have not changed greatly in the course of the last 100 000 OOO years.
These examples, however, touch only on the observable outcome of the interaction between the copepod and the substrate. They tell us nothing about the mechanisms involved in that interaction. No explanation could be found so far, for example, for the, so-called ‘arteriotropism” (Schuurmans Stekhoven, 1936). Some species of Lernaeocera Blainville, 1822 and Haemobaphes Steenstrup and Liitken, 1861, and virtually all of Cardiodectes Wilson, 1917, can unerringly direct their penetration of the host tissues to reach their target site, the cardiac region of the host.
Advances in Parasitology, Vol. 19 by W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.)