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School of Ocean, Yantai University, Yantai, China

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New Contribution to the Morphological Taxonomy of Three Marine Cyrtophorid Ciliates from the Yellow Sea, China (Ciliophora: Cyrtophorida)

Xiangrui Chen

Acta Protozoologica, Volume 50, Issue 2, 2011, pp. 105-119

https://doi.org/10.4467/16890027AP.11.012.0012

The morphology and infraciliature of three marine cyrtophorid ciliates, Dysteria lanceolata Claparède and Lachmann, 1859, Lynchella nordica Jankowski, 1968 and Chlamydonyx paucidentatus Deroux, 1976, collected from the coastal waters of Qingdao, China, were investigated using live observations and the protargol impregnation method. D. lanceolata was oval in body outline, about 65 × 45 μm in vivo, with a subcaudally positioned podite, six to seven right kineties, two or three frontoventral kineties, and two ventral contractile vacuoles. The improved diagnosis for L. nordica and a key to all known Lynchella species are supplied. The rediscovery of C. paucidentatus enables us to accept its taxonomic identification (e.g., separation from a morphologically similar species Trochilioides recta). The genus Trochilioides Deroux, nov. gen., which was a nomen nudum according to ICZN (1999), is re-established.

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New discoveries of the genus Thuricola Kent, 1881 (Ciliophora, Peritrichia, Vaginicolidae), with descriptions of three poorly known species from China

Xiangrui Chen

Acta Protozoologica, Volume 57, Issue 2, 2018, pp. 123-143

https://doi.org/10.4467/16890027AP.18.011.8985

Members of the genus Thuricola are a highly specialized group of peritrichous ciliates possessing a protective barrel-shaped lorica. The genus presents many difficulties in terms of species separation and definition, and in this context the present study investigates three species by protargol staining and analyses of SSU rDNA sequences. Based on their morphologic characteristics and biotope, they were identified as three poorly known forms in Thuricola, namely T. obconica Kahl, 1933, T. kellicottiana (Stokes, 1887) Kahl 1935 and T. folliculata Kent, 1881, respectively. T. obconica is characterized by possessing curved lorica and a single valve in vivo. T. kellicottiana is distinguished by two valves with a spine on the main valve, and a generally long internal stalk upon which the zooids sit. T. folliculata also has two valves but lacks a spine. The ciliature of the three species are basically similar. The main features are characterized as follows: infundibular polykineties 1–3 (P1–3) are relatively long and composed of three rows each; P1 bends twice and comprises three equally long rows; P2 ends near the second bend of P1 with all rows exhibiting a staggered arrangement; P3 converges with P1 at adstomal end, its row 1 at least twice as long as the other two rows; epistomial membranes 1 and 2 are present. Silverline system in Vorticella-pattern. Phylogenetic analyses indicate that the three ciliates in this study cluster together within one of the two major sub-clades within the Vaginicolidae.

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