Abstract
The morphology, infraciliature and small subunit ribosomal RNA gene-based phylogeny of an urostylid ciliate, Monocoronella carnea n. g., n. sp., found in coastal areas off Daya Bay, Southern China, were investigated. The new genus Monocoronella n. g. is recognized by the following features: having conspicuous frontal cirri forming a long and single corona; buccal and frontoterminal cirri present; single marginal row on each side; adoral zone, midventral complex and transverse cirri in Pseudokeronopsis mode. The type species M. carnea n. sp. is diagnosed by the combination of marine habitat and brown-reddish color of the cortical granules. Phylogenetic analyses for the new taxon indicate that Monocoronella n. g. is most closely related to Bergeriella, and is located within the core Urostylida clade. A misidentification in previous literature was recognized and a new species, Monocoronella dragescoi n. sp. [Basionym: Holosticha (Keronopsis) monilata (Kahl 1928) sensu Dragesco (1970) et sensu Dragesco and Dragesco-Kernéis (1986), non sensu Kahl (1928)], was suggested.
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