Description of Two Oxytrichid Ciliates (Ciliophora: Sporadotrichida: Oxytrichidae) Newly Reported from Korea

To investigate the Korean ciliate fauna, two oxytrichid ciliates, Laurentiella strenua (Dingfelder, 1962) and Notohymena australis (Foissner and O'Donoghue, 1990) were collected from the Taehwa River in Ulsan, South Korea. These two ciliates are reported for the first time in Korea. Descriptions were based on the observation of live and silver stained specimens. Diagnoses of these species are as follows: Laurentiella strenua: body is approximately $320{\times}170\;{\mu}m$ in size, an inverted triangular shape. Cytoplasmic globules are present in both anterior and posterior margins, transparent and sized $10-15\;{\mu}m$ in live specimens. Adoral zone of membranelles is covering about 50% of body length. Frontoventral-transverse cirri are arranged diagonally into 5 rows. Transverse cirri are arranged almost longitudinally and varied 4-6 in number. Dorsal kineties are 11 rows with multiple fragmentations. Macronuclei are 4-5 in number. Notohymena australis: body is approximately $170{\times}50\;{\mu}m$ in live specimens, slender and long ellipsoidal shape. Yellowish green cortical granules are present as pairs or rows which composed of 3-6 granules. Adoral zone of membranelles is covering about 36% of the body length, composed of 39-50 adoral membranelles. Dorsal kineties is 6 rows. Macronuclei are 2 in number.