Myxozoan Evolution, Ecology and Development

0456211 - BC 2016 RIV CH eng M - Část monografie knihy
Fiala, Ivan - Bartošová-Sojková, Pavla - Whipps, C. M.
Classification and Phylogenetics of Myxozoa.
Myxozoan Evolution, Ecology and Development. Cham: Springer International Publishing, 2015 - (Okamura, B.; Gruhl, A.; Bartholomew, J.), s. 85-110. ISBN 978-3-319-14752-9
Institucionální podpora: RVO:60077344
Klíčová slova: Taxonomy * Classification * Myxosporea * Actinosporea * Spore * Phylogeny
Kód oboru RIV: EG - Zoologie

Myxozoans evolved as an endoparasitic radiation of cnidarians exploiting invertebrate and vertebrate (primarily fish) hosts in freshwater and marine environments. Currently, there are some 2,200 nominal species classified to 64 genera and 17 families. These groupings are mainly based on spore morphology. This chapter provides an updated spore-based taxonomic key that takes into account the recent recognition of the cnidarian origin of myxozoans as well as important revisions at generic, family and suborder levels over the last decade. A list of generic synonyms is also reviewed here. Myxozoan molecular phylogenies largely disagree with traditional spore-based classification systems, probably due to extreme plasticity in myxospore morphologies that has resulted in extensive convergence. Molecular phylogenies of myxozoans (based on all existing SSU sequences and those available for species with known actinosporeproducing stages) resolve the malacosporeans, the freshwater myxosporeans, the marine myxosporeans and the sphaerosporid lineages. Within these clades species can be resolved according to definitive host type and, partially, according to host environment. Numerous exceptions are indicative of several recursions of species into freshwater or marine environments. Further resolution within clades identifies groups of species according to tissue tropism in their vertebrate hosts. We suggest future studies of myxozoan systematics to address persisting taxonomic and phylogenetic discrepancies and make recommendations for describing taxa in the absence of sequence data or when sequence and morphological data are incongruent.
Trvalý link: http://hdl.handle.net/11104/0256775