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Findings on three endocommensal scuticociliates (Protista, Ciliophora) from freshwater mollusks, including their morphology and molecular phylogeny with descriptions of two new species
Ist Teil von
Marine life science & technology, 2024-05, Vol.6 (2), p.212-235
Ort / Verlag
Singapore: Springer Nature Singapore
Erscheinungsjahr
2024
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Species of the ciliate genera
Myxophyllum
and
Conchophthirus
are found as endocommensals of terrestrial and freshwater mollusks, respectively. So far, there have been few studies of these genera and morphological data for most members are often incomplete. In the present work, two new species,
Myxophyllum weishanense
sp. nov. and
Conchophthirus paracurtus
sp. nov., and a known species,
Conchophthirus lamellidens
, were isolated from hosts in Lake Weishan Wetland, China. Taxonomic studies indicate that
M. weishanense
sp. nov. can be recognized mainly by the combination of about 60 somatic kineties on both ventral and dorsal sides and the presence of caudal cilia.
Conchophthirus paracurtus
sp. nov. differs from congeners in its body shape and size, having a glabrous area on the posterior right side, and having fewer somatic kineties. In addition, differences in their ITS2 (Internally Transcribed Spacer 2) secondary structures support the discrimination of the two new species from their highly similar congeners. An improved diagnosis for the poorly known species,
C. lamellidens
is also provided. Phylogenetic analyses reveal that members of the genus
Myxophyllum
belong to a fully supported clade that is sister to a large, poorly supported clade consisting of Hemispeiridae, Ancistridae, and several lineages of the nonmonophyletic Cyclidiidae. The
Myxophyllum
clade also includes
Protophyra ovicola
JQ956552, a possible misidentification. Sequences of the two new
Conchophthirus
species cluster with other congeners in a fully supported clade that is unrelated to either the ‘typical’ thigmotrichs or to pleuronematids, thus conflicting with the traditional classification, and may represent an orphan scuticociliate lineage.