Document Detail

Evolutionary expansion of the Monogenea.
MedLine Citation:
PMID:  7729979     Owner:  NLM     Status:  MEDLINE    
The evolutionary expansion of the monogeneans has taken place in parallel with the diversification of the fish-like vertebrates. In this article the main trends in monogenean evolution are traced from a hypothetical skin-parasitic ancestor on early vertebrates. Special consideration is given to the following topics: early divergence between skin feeders and blood feeders; diversification and specialization of the haptor for attachment to skin; transfer from host to host, viviparity and the success of the gyrodactylids; predation on skin parasites and camouflage; colonization of the buccal and branchial cavities; diversification and specialization of the haptor for attachment to the gills; phoresy in gill parasites; the development of endoparasitism and the origin of the cestodes; the success of dactylogyroidean gill parasites; the uniqueness of the polyopisthocotyleans; ovoviviparity and the colonization of the tetrapods. Host specificity has been the guiding force of coevolution between monogeneans and their vertebrate hosts, but the establishment of monogeneans on unrelated hosts sharing the same environment (host-switching) may have been underestimated. Host-switching has provided significant opportunities for evolutionary change of direction and is probably responsible for the establishment of monogeneans on cephalopod molluscs, on the hippopotamus and possibly on chelonians. There are indications that host-switching may be more common in monogeneans that spread by direct transfer of adults/juveniles from host to host. A limitation on the further expansion of monogeneans is the need for water for the dispersal of the infective larva (oncomiracidium).
G C Kearn
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  International journal for parasitology     Volume:  24     ISSN:  0020-7519     ISO Abbreviation:  Int. J. Parasitol.     Publication Date:  1994 Dec 
Date Detail:
Created Date:  1995-06-01     Completed Date:  1995-06-01     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0314024     Medline TA:  Int J Parasitol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1227-71     Citation Subset:  IM    
School of Biological Sciences, University of East Anglia, Norwich, U.K.
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MeSH Terms
Feeding Behavior
Fishes / parasitology
Gills / parasitology
Host-Parasite Interactions
Mouth / parasitology
Skin / parasitology
Trematoda / anatomy & histology,  growth & development,  physiology*
Vertebrates / parasitology*
Erratum In:
Int J Parasitol 1995 Mar;25(3):407

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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