Multi-gene phylogeny of Tetrahymena refreshed with three new histophagous species invading freshwater planarians

Parasitology Research
M Rataj, Peter Vďačný

Abstract

Planarians represent an insufficiently explored group of aquatic invertebrates that might serve as hosts of histophagous ciliates belonging to the hymenostome genus Tetrahymena. During our extensive research on freshwater planarians, parasitic tetrahymenas were detected in two of the eight planarian species investigated, namely, in Dugesia gonocephala and Girardia tigrina. Using the 16S and 18S rRNA genes as well as the barcoding cytochrome oxidase subunit I, one ciliate species was identified as T. scolopax and three species were recognized as new forms: T. acanthophora, T. dugesiae, and T. nigricans. Thus, 25% of the examined planarian taxa are positive for Tetrahymena species and three of them represent new taxa, indicating a large undescribed ciliate diversity in freshwater planarians. According to phylogenetic analyses, histophagous tetrahymenas show a low phylogenetic host specificity. Although T. acanthophora, T. dugesiae, and T. scolopax clustered together within the "borealis" clade, the former species has been detected exclusively in G. tigrina, while the two latter species only in D. gonocephala. Tetrahymena nigricans, which has been isolated only from G. tigrina, was classified within the "paravorax" clade along wit...Continue Reading

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Citations

Nov 26, 2020·Revista brasileira de parasitologia veterinária = Brazilian journal of veterinary parasitology : Órgão Oficial do Colégio Brasileiro de Parasitologia Veterinária·Rachel Sordi RelvasPedro Henrique Magalhães Cardoso
Apr 9, 2021·Molecular Phylogenetics and Evolution·Matej Rataj, Peter Vd'ačný
May 16, 2021·International Journal for Parasitology·Fabiola da Silva CostaMariana Fonseca Rossi

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Datasets Mentioned

BETA
1427132
1427127
1425919

Methods Mentioned

BETA
dissection
PCR
electrophoresis
histone acetylation

Software Mentioned

MEGA
Inkscape
TREE
PlotSimMap . R
ClustalW
PlotSimMap
MrBayes
IQ
BioEdit
package diversitree

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