Evidence from the resurrected family Polyrhabdinidae Kamm, 1922 (Apicomplexa: Gregarinomorpha) supports the epimerite, an attachment organelle, as a major eugregarine innovation

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Authors

PASKEROVA Gita G. MIROLIUBOVA Tatiana S. BARDŮNEK VALIGUROVÁ Andrea JANOUŠKOVEC Jan KOVÁČIKOVÁ Magdaléna DIAKIN Andrei SOKOLOVA Yuliya Ya. MIKHAILOV Kirill V. ALEOSHIN Vladimir V. SIMDYANOV Timur G.

Year of publication 2021
Type Article in Periodical
Magazine / Source PeerJ
MU Faculty or unit

Faculty of Science

Citation
Web https://peerj.com/articles/11912/
Doi http://dx.doi.org/10.7717/peerj.11912
Keywords Eugregarinida; Intestinal parasites; Marine gregarines; Ultrastructure; SSU and LSU rDNA; Host-parasite relationships; Environmental DNA sequences; Phylogeny; Taxonomy
Description We obtained the first data on fine morphology of aseptate eugregarines Polyrhabdina pygospionis and Polyrhabdina cf. spionis, the type species. We demonstrate that their AOs differ from the mucron in archigregarines and represent an epimerite structurally resembling that in other eugregarines examined using electron microscopy. We then used the concatenated ribosomal operon DNA sequences (SSU, 5.8S, and LSU rDNA) of P. pygospionis to explore the phylogeny of eugregarines with a resolution superior to SSU rDNA alone. The obtained phylogenies show that the Polyrhabdina clade represents an independent, deep-branching family in the Ancoroidea clade within eugregarines. Combined, these results lend strong support to the hypothesis that the epimerite is a synapomorphic innovation of eugregarines. Based on these findings, we resurrect the family Polyrhabdinidae Kamm, 1922 and erect and diagnose the family Trollidiidae fam. n. within the superfamily Ancoroidea Simdyanov et al., 2017. Additionally, we re-describe the characteristics of P. pygospionis, emend the diagnoses of the genus Polyrhabdina, the family Polyrhabdinidae, and the superfamily Ancoroidea.
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