Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/23925
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Tracing ancient evolutionary divergence in parasites (Forthcoming/Available Online)
Authors: Tinsley, Richard C
Tinsley, M C
Contact Email: mt18@stir.ac.uk
Keywords: Monogenea
Polystomatidae
Polystomoides
Uropolystomoides
living fossils
site-specific attachment adaptations
Issue Date: 31-Aug-2016
Publisher: Cambridge University Press
Citation: Tinsley RC & Tinsley MC Tracing ancient evolutionary divergence in parasites (Forthcoming/Available Online), Parasitology.
Abstract: For parasitic platyhelminths that generally lack a fossil record, there is little information on the pathways of morphological change during evolution. Polystomatid monogeneans are notable for their evolutionary diversification, having originated from ancestors on fish and radiated in parallel with tetrapod vertebrates over more than 425 million years. This study focuses on the genus Polystomoides that occurs almost worldwide on freshwater chelonian reptiles. Morphometric data show a major divergence in structural adaptations for attachment; this correlates with a dichotomy in micro-environmental conditions in habitats within the hosts. Species infecting the urinary tract have attachment organs with large hamuli and small suckers; species in the oro-nasal tract differ fundamentally, having small hamuli and large suckers. Zoogeographical and molecular evidence supports ancient separation of these site-specific clades: a new genus is proposed – Uropolystomoides – containing urinary tract species distinct from Polystomoides sensu stricto in oro-nasal sites. Aside from differences in attachment adaptations, body plans have probably changed little over perhaps 150 million years. This case contrasts markedly with polystomatids in other vertebrate groups where major morphological changes have evolved over much shorter timescales; the chelonian parasites show highly stable morphology across their global distribution over a long period of evolution, exemplifying ‘living fossils’.
Type: Journal Article
URI: http://hdl.handle.net/1893/23925
DOI Link: http://dx.doi.org/10.1017/S0031182016001347
Rights: This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. Published in Parasitology by Cambridge University Press. Copyright 2016 Cambridge University Press.
Affiliation: University of Bristol
Biological and Environmental Sciences

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