Oligotrich ciliates are common members of marine microplankton. However, their biodiversity is not well documented. In this study, the morphology and phylogenetic positions of three new oligotrich species, Spirostrombidium apourceolare spec. nov., Spirostrombidium subtropicum spec. nov. and Parallelostrombidium conicum spec. nov., collected from coastal habitats of southern China, were investigated. Spirostrombidium apourceolare is characterized by the girdle kinety which encircles the cell twice as two dextrally oriented whorls with some undulations and by the presence of several macronuclear nodules. Spirostrombidium subtropicum is recognized by the girdle kinety encircling the cell as two dextrally oriented whorls and extrusomes arranged in a stripe along the girdle kinety. Parallelostrombidium conicum differs from its congeners by the obconic body shape and the posterior portion of the girdle kinety extending downwards on the left ventral side to reach the posterior pole. In small-subunit rRNA gene trees, S. subtropicum clusters with Omegastrombidium elegans and Varistrombidium kielum, and Parallelostrombidium conicum is sister to the clade containing Novistrombidium sinicum, Novistrombidium orientale and Parallelostrombidium sp.
Five yeast strains, phenotypically indistinguishable from Yarrowia lipolytica and Yarrowia deformans, were recovered from different animal-related samples. One strain was isolated from a bacon processing plant in Denmark, two strains from chicken liver in the USA, one strain from chicken breast in Hungary and one from minced beef in Hungary. Comparisons of the sequences of their large subunit rRNA gene D1/D2 domain and the internal transcribed spacer (ITS) regions revealed that, despite their phenotypic similarity, they represent a novel yeast species of the Yarrowia clade with Y. deformans being the genotypically closest relative (LSU rRNA gene D1/D2 and ITS region similarity of 97.0 and 93.7 %, respectively). Yarrowia divulgata f.a., sp. nov. is proposed to accommodate these strains with F6-17T ( = CBS 11013T = CCUG 56725T) as the type strain. Some D1/D2 sequences of yeasts from marine habitats were found in the GenBank database that were identical to those of the strains of Y. divulgata f.a., sp. nov. Unfortunately, these strains were not available for our study.
In the present work, we investigated the phylogenetic position and phenotypic characteristics of eight yeast isolates collected from migratory birds on the island of Ustica, Italy. A phylogenetic analysis based on the D1/D2 region of the large-subunit rRNA gene showed that all isolates clustered as a single separate lineage within the Wickerhamomyces clade. They exhibited distinct morphological and physiological characteristics and were clearly separated from their closest relatives, Wickerhamomyces lynferdii, Wickerhamomyces anomalus and Wickerhamomyces subpelliculosus, in blastn searches. On the basis of the isolation source, physiological features and molecular strain typing carried out with randomly amplified polymorphic DNA (RAPD)-PCR and minisatellite-primed (MSP)-PCR analysis, the isolates were identified as strains of the same species. The name Wickerhamomyces sylviae f.a., sp. nov. is proposed to accommodate these novel strains; the type strain is U88A2T ( = PYCC 6345T = CBS 12888T). The MycoBank number is MB 804762.