Stentor roeselii Ehrenberg, 1835

Jung, Ji Hye Kim and Jae-Ho, 2018, New record of five ciliates (Protozoa, Ciliophora) collected in eastern Gangwon-do Province, South Korea, Journal of Species Research 7 (2), pp. 181-186 : 182-183

1. Stentor roeselii Ehrenberg, 1835 ( Fig. 1 )

Material examined. Freshwater collected from the Riv­ er Gyeongpochen , Unjeong­dong , Gangneung­si, Gangwon­do, Korea (37°47 ʹ 20 ʺ N, 128°54 ʹ 34 ʺ E) on May 12, 2017 .

Diagnosis. Body size 265­410 × 60­110 μm on free living form; attached cell trumpet shape about 500­1,000 μm long in vivo; body colorless; flexible, highly contractile body; weakly loricated; 178­187 adoral membranelles; 56­62 somatic kineties; about 13 buccal kineties including 1 peristomial kinety; macronucleus band­like shaped.

Distribution. Cosmopolitan ( Austria, Benin, Black Sea, Caspian Sea, Danube River, Gdańsk Bay, Germany, Japan, Korea).

Remarks. Stentor roeselii highly resembles S. muelleri Ehrenberg, 1831 in the body size, the body shape, the color of cortical granules, the number of somatic kineties and the number of buccal kineties ( Foissner et al., 1992). However, it differs from S. muelleri in the shape of the macronucleus (band­like shape vs. moniliform).

Voucher slides. Two slides of protargol impregnated spe­

B

cimens were deposited at National Institute of Biological Resources, Korea (NIBRPR0000107960, NIBRPR00001 07961).

Figures

Fig. 1. Stentor roeselii in vivo (A, B) and after protargol impregnation (C, D). A. Living cells attached to substrates. B. Free swimming cell. C, D. Somatic and oral ciliature with band­like macronucleus. AZM, adoral zone of membranelles; BK, buccal kinety; MA, macronucleus; SK, somatic kinety. Scale bars: B=200μm, C, D=50 μm.