Abstract
The morphology, four ontogenetic stages, and the phylogenetic relationships based on the small subunit RNA-gene of Holosticha aestuarina nov. spec. from the Yangtze River Estuary (Shanghai) were investigated. The new species differs from the congeners by the following combination of features: body size 160–196 × 27–36 μm in vivo, a vesicular structure containing one or two bean-shaped opaque particles, 24–32 adoral membranelles, 16–34 midventral pairs, 17–26 left marginal cirri, 22–32 right marginal cirri, six or seven transverse cirri, four dorsal kineties, and usually two macronuclear nodules. The anlage for the left marginal row of the proter very likely originates de novo (anterior portion) and from parental cirri (posterior portion). Further, we provide a morphological description of a Chinese population of H. muuiensis Kim et al., 2017, originally discovered in South Korea, indicating that it is confined to the Eastern Asia region. Its SSU rDNA sequence is identical with that of the type population and forms a clade with the available Holosticha sequences. By contrast, H. aestuarina nov. spec. is sister to the Holosticha + Uncinata clade, indicating that Uncinata is a subgenus of Holosticha.
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