A new view on the morphology and phylogeny of eugregarines suggested by the evidence from the gregarine Ancora sagittata Leuckart, 1860) Labbé, 1899 (Apicomplexa: Eugregarinida)

Simdyanov, T.G.; Guillou, L.; Diakin, A.Y.; Mikhailov, K.V.; Schrével, J.; Aleoshin, V.V.

Авторы: Simdyanov T.G., Guillou L., Diakin A.Y., Mikhailov K.V., Schrével J., Aleoshin V.V.
Журнал: PeerJ
Номер: 5:e3354
Год издания: 2017
Издательство: PeerJ
Местоположение издательства: San Francisco
Первая страница: 1
Последняя страница: 46
DOI: 10.7717/peerj.3354
Аннотация: We present the results of an ultrastructural and molecular phylogenetic study on the marine gregarine Ancora sagittata from the polychaete Capitella capitata followed by evolutionary and taxonomic synthesis of the morphological and molecular phylogenetic evidence on eugregarines. The ultrastructure of A. sagittata generally corresponds to that of other eugregarines, but reveals some differences in epicytic folds (crests) and attachment apparatus to gregarines in the family Lecudinidae, where A. sagittata has been classified. Molecular phylogenetic trees based on SSU (18S) rDNA reveal several robust clades (superfamilies) of eugregarines, including Ancoroidea superfam. nov., which comprises two families (Ancoridae fam. nov. and Polyplicariidae) and branches separately from the Lecudinidae; thus, all representatives of Ancoroidea are here officially removed from the Lecudinidae. Analysis of sequence data also points to possible cryptic species within A. sagittata and the inclusion of numerous environmental sequences from anoxic habitats within the Ancoroidea. LSU (28S) rDNA phylogenies, unlike the analysis of SSU rDNA alone, recover a well-supported monophyly of the gregarines involved (eugregarines), although this conclusion is currently limited by sparse taxon sampling and the presence of fast-evolving sequences in some species. Comparative morphological analyses of gregarine teguments and attachment organelles lead us to revise their terminology. The terms "longitudinal folds" and "mucron" are restricted to archigregarines, whereas the terms "epicystic crests" and "epimerite" are proposed to describe the candidate synapomorphies of eugregarines, which, consequently, are considered as a monophyletic group. Abolishing the suborders Aseptata and Septata, incorporating neogregarines into the Eugregarinida, and treating the major molecular phylogenetic lineages of eugregarines as superfamilies appear as the best way of reconciling recent morphological and molecular evidence. Accordingly, the diagnosis of the order Eugregarinida Léger, 1900 is updated.
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A new view on the morphology and phylogeny of eugregarines suggested by the evidence from the gregarine Ancora sagittata Leuckart, 1860) Labbé, 1899 (Apicomplexa: Eugregarinida)статья Электронная публикация

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