Six newly recorded species of the genus Strombidium ciliates Claparède and Lachmann, 1859 (Ciliophora: Spirotricha: Oligotrichia) from southern coast of Korea

Abstract

To supply the morphological and ecological information of oligotrich ciliates in Korea, water samples were seasonally collected in Gwangyang Bay (19 sites) and Jinhae Bay (23 sites) from August 2010 to February, 2012 and processed by QPS (quantitative protargol staining) method. As a result, six species belonging to the genus Strombidium Claparède and Lachmann, 1859 are identified: Strombidium emergens Kahl, 1932; S. dalum Lynn et al., 1988; S. epidemum Lynn et al., 1988; S. tressum Lynn et al., 1988; S. bilobum Lynn and Gilron, 1993; S. pollostomum Lynn and Gilron, 1993. Strombidium emergens is a middle sized Strombidium (20-50 µm in length) and has open and deep oral groove to girdle portion. S. dalum is a small sized Strombidium (≤ 20 µm in length), having torch-like spiralled anterior membranelles and inverted triangles-shaped macronucleus on posterior pole. The small sized S. epidemum has conspicuous trichites surrounding the body anterior to girdle portion and ventral membranelles are distinctly separated from anterior membranelles. The small sized S. tressum has torch-like spiralled and extremely long trichites among the cilia of anterior membranelles. The middle sized S. bilobum has bilobed macronucleus. S. pollostomum is also a small sized Strombidium but its ventral membranelles are continuously connected with anterior membranelles. These six species were newlS (quantitative protargol staining) method. As a result, six species belonging to the genus Strombidium Claparède and Lachmann, 1859 are identified: Strombidium emergens Kahl, 1932; S. dalum Lynn et al., 1988; S. epidemum Lynn et al., 1988; S. tressum Lynn et al., 1988; S. bilobum Lynn and Gilron, 1993; S. pollostomum Lynn and Gilron, 1993. Strombidium emergens is a middle sized Strombidium (20-50 µm in length) and has open and deep oral groove to girdle portion. S. dalum is a small sized Strombidium (≤ 20 µm in length), h