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The morphology and life-cycle of the oviparous Oögyrodactylus farlowellae gen. et sp.nov. (Monogenea, Gyrodactylidea)

Published online by Cambridge University Press:  06 April 2009

P. D. Harris
P. D. Harris
Affiliation:
Department of Zoology, Westfield College, University of London, London NW3 7ST
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Summary

Oögyrodactylus farlowellae gen. et sp.nov., an oviparous monogenean, is described from the skin and fins of Farlowella amazonum, a South American loricarid catfish. The Oögyrodactylidae fam.nov., containing O. farlowellae and Phanerothecium caballeroi Kritsky and Thatcher, 1977, is placed with the Gyrodactylidae in the Gyrodactylidea. Although oviparous, the Oögyrodactylids are closely related to the viviparous gyrodactylids. Both families share a combination of characters, including haptor morphology, articulated marginal hooks and spike sensilla, which is not seen in other monogeneans. O. farlowellae is similar to a hypothetical ancestor of the gyrodactylids and shows that the family arose from monopisthocotylean rather than polyopisthocotylean stock. There is a close resemblance between the reproductive system of the immature Oögyrodactylus and that of the mature Gyrodactylus, suggesting that progenesis, involving the precocious maturation of oocytes, may have been important in the evolution of the viviparous genera. O. farlowellae retains eggs individually in the ootype until embryonation is comparatively advanced. After oviposition the eggs adhere to the substrate and hatch to give a crawling, unciliated larva. These are adaptations to a host which inhabits fast-flowing streams, where the eggs and infective larvae are exposed to a constant, uni-directional water current. The life-cycle (egg to adult) is completed in 11–13 days at 27 °C.

Type
Research Article
Information
Parasitology , Volume 87 , Issue 3 , December 1983 , pp. 405 - 420
Copyright
Copyright © Cambridge University Press 1983

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