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Studies on the behaviour, and development in fish, of Subtriquetra subtriquetra: a uniquely free-living pentastomid larva from a crocodilian

Published online by Cambridge University Press:  06 April 2009

Judith M. Winch  and
J. Riley
Judith M. Winch
Affiliation:
Department of Biological Sciences, University of Dundee, Dundee DD1 4HN, Scotland
J. Riley
Affiliation:
Department of Biological Sciences, University of Dundee, Dundee DD1 4HN, Scotland
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Summary

The primary larva of the porocephalid pentastomid Subtriquetra subtriquetra, which infects the nasopharynx of Caiman sclerops, is uniquely free-living. Eggs hatch within the nasal passages and the emergent larvae can remain infective to the fish intermediate host for 4–5 days. During this period larvae exhibit very stereotyped behaviour, alternating between a characteristic stationary ‘fishing’ posture and very brief periods of movement. Larval activity increases significantly at 3 days, probably effecting dispersal to a more favourable site for host invasion. Host location is passive and invading larvae penetrate to the swim-bladder where subsequent larval development, which involves 7 moults, occurs. All 8 larval stages are freely mobile in the swim-bladder and possess hooks. Sensilla, disposed in characteristic patterns, are present throughout development, increasing in number to the infective stage; the majority of sensilla are located on sensory papillae.

Type
Research Article
Information
Parasitology , Volume 93 , Issue 1 , August 1986 , pp. 81 - 98
Copyright
Copyright © Cambridge University Press 1986

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