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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).