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Gastrocotylidae), but it also shows marked differences. Thus, both
species possess similar multiciliate and non-ciliate receptors, but sizes
and numbers of electron-dense collars vary. In the future, comparative
ultrastructural and functional studies of such species may clarify the role
of the various receptor types in distinguishing microhabitats and mating
partners. In the aspidogastreanL. manteri, at least eight types of receptors,
some occurring in very great numbers, have been demonstrated, and

Niche Restriction and Mate Finding in Vertebrate Hosts 181


Fig. 9.4. Non-pharyngeal sensory receptors in anterior part of body ofPricea multae
(Monogenea, Polyopisthocotylea, Gastrocotylidae) from the gills ofScomberomorus
commerson(from Rohde and Watson, 1996).

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