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LIFE CYCLE AND PARATENESIS OF AMERICAN GORDIIDS (NEMATOMORPHA: GORDIIDA)

LIFE CYCLE AND PARATENESIS OF AMERICAN GORDIIDS (NEMATOMORPHA: GORDIIDA) To complete their life cycle, gordiids must make a transition from aquatic to terrestrial environments. However, epibenthic aquatic larvae and their terrestrial definitive hosts do not overlap in habitat. This has led many investigators to suggest that infections are acquired through the ingestion of insects, which become infected as aquatic larvae with gordiid cysts and subsequently carry gordiids to land. This proposed life cycle was experimentally tested using 3 common American species of gordiids: Gordius robustus , Paragordius varius , and Chordodes morgani . Cysts of all 3 species survived the metamorphosis of Tanytarsus sp., a midge. Subsequent infection trials of definitive hosts with cysts from imagos show that cysts surviving the metamorphosis of insects remained viable and free of host internal defense reaction. Data from naturally infected mayflies, Callibaetus sp., show that encystment and survival of gordiids within aquatic insects occur in nature. Paratenesis between paratenic hosts was also shown to be possible in these 3 species. This latter finding appears to indicate that cysts formed in spurious paratenic hosts may not be lost but may eventually transfer to normal paratenic hosts. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Parasitology Allen Press

LIFE CYCLE AND PARATENESIS OF AMERICAN GORDIIDS (NEMATOMORPHA: GORDIIDA)

Hanelt, B.; Janovy, J.
Journal of Parasitology , Volume 90 (2) – Apr 1, 2004
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References (25)

Publisher
Allen Press
Copyright
American Society of Parasitologists
Subject
INVERTEBRATE-PARASITES RELATIONSHIPS
ISSN
0022-3395
eISSN
1937-2345
DOI
10.1645/GE-78R
pmid
15165044
Publisher site
See Article on Publisher Site

Abstract

To complete their life cycle, gordiids must make a transition from aquatic to terrestrial environments. However, epibenthic aquatic larvae and their terrestrial definitive hosts do not overlap in habitat. This has led many investigators to suggest that infections are acquired through the ingestion of insects, which become infected as aquatic larvae with gordiid cysts and subsequently carry gordiids to land. This proposed life cycle was experimentally tested using 3 common American species of gordiids: Gordius robustus , Paragordius varius , and Chordodes morgani . Cysts of all 3 species survived the metamorphosis of Tanytarsus sp., a midge. Subsequent infection trials of definitive hosts with cysts from imagos show that cysts surviving the metamorphosis of insects remained viable and free of host internal defense reaction. Data from naturally infected mayflies, Callibaetus sp., show that encystment and survival of gordiids within aquatic insects occur in nature. Paratenesis between paratenic hosts was also shown to be possible in these 3 species. This latter finding appears to indicate that cysts formed in spurious paratenic hosts may not be lost but may eventually transfer to normal paratenic hosts.

Journal

Journal of Parasitology – Allen Press

Published: Apr 1, 2004

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