ArticleBMC microbiology2026
Revealing hidden diversity in gonostomatid ciliates (Ciliophora, Hypotrichia): integrative evidence supports two new species, a new genus, and Wallackiidae fam. nov.
Article in BMC microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundGonostomatidae are among the most common terrestrial hypotrichs and are readily recognized by a distinctive oral apparatus (knee-shaped adoral zone of membranelles; monokinetidal undulating membranes with a widely spaced paroral and densely spaced endoral). A further key diagnostic trait is morphogenesis, in which the proter and opisthe share primary frontal-ventral-transverse (FVT) primordia that later split into secondary primordia. Despite their apparent diversity in soils, comparatively few gonostomatid species have been described, and most lack complete morphogenetic and/or molecular documentation. This insufficient documentation obscures relationships and contributes to taxonomic instability, highlighting the need for integrative taxonomy combining morphology, detailed morphogenesis, and multigene phylogenetics.
resultsFrom Korean soils we discovered two novel hypotrichs with a gonostomatid oral apparatus. The first is a new gonostomatid species with five FVT cirral rows and one or two transverse cirri. Its morphogenesis is distinctive within Gonostomatidae: the rightmost cirral row arises predominantly from anlage V with a short posterior contribution from anlage IV (i.e., pseudorow). Phylogenetic analyses show marker-dependent placements: the new species clusters with Metagonostomum gonostomoidum in the 18S rDNA tree but with Paragonostomoides xianicum in ITS1-5.8S-ITS2, 28S rDNA, and multi-gene datasets, indicating that the 18S rDNA marker lacks sufficient phylogenetic signal unlike the other markers; integrative evidence supports establishment of Metagonostomoides gen. nov. The second species, Wallackia koreana sp. nov., has a buccal cirral row reduced to two buccal cirri and an adoral zone occupying ~ 62% of body length; it clusters with W. bujoreani and Cladotricha australis, and the three group with Chaetospiridae in ITS1-5.8S rDNA-ITS2 and multi-gene datasets. A comparative review further shows that Wallackia and Neowallackia deviate from core gonostomatids by lacking shared primary primordia (proter and opisthe anlagen form independently), supporting Wallackiidae fam. nov. Re-evaluation of the "gonostomatid-type" oral apparatus across hypotrichs restricts it to Gonostomatidae, Chaetospiridae, and Wallackiidae fam. nov.
conclusionWe document two new soil hypotrich species from Korea, one representing a new gonostomatid genus (Metagonostomoides gen. nov.) and the other a new Wallackia species (W. koreana sp. nov.), and show that their integrative placement helps resolve relationships among hypotrichs with a gonostomatid oral apparatus. The combined morphological, morphogenetic, and multigene phylogenetic evidence supports recognition of Wallackiidae fam. nov. and restricts the gonostomatid-type oral apparatus to Gonostomatidae, Chaetospiridae, and Wallackiidae fam. nov.
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