Aspidisca steini (Buddenbrock, 1920) Kahl, 1932

Kim, Ji Hye & Jung, Ji Hye Moon and Jae-Ho, 2018, New records of 24 ciliate species (Protozoa, Ciliophora) collected in South Korea, Journal of Species Research 7 (4), pp. 291-314 : 293-294

3. Aspidisca steini (Buddenbrock, 1920) Kahl, 1932

( Fig. 3 )

Material examined. Marine water (salinity 29‰) collected from Jungjuhang Port , Hamdeok-ri , Jocheon-eup, Jeju-si, Jeju-do, Korea (33°32 ʹ 81.2 ʺ N, 126°39 ʹ 58.8 ʺ E) on July 14, 2018 .

Diagnosis. Marine habitat, body about 40 × 25 μm in vivo, broadly ellipsoidal to bean shape with four dorsal ridges; inverted U-shape macronucleus; 7 frontoventral cirri polystyla-arrangement; 5 transverse cirri; 4 dorsal kineties; AZM1 composed of 4 membranelles; AZM2 composed of 9-11 membranelles.

Distribution. Benin, China, Germany, Korea.

Remarks. Park et al. (2017) reported a Korean population without the description of morphology, so that we did not compare with our population. Our Korean population of A. steini is slightly different from the Chinese population in the number of adoral membranelles in part 2 (9-11 vs. 12-15) ( Song and Wilbert, 1997). Aspidisca steini is different from its closest congener, A. aculeata (Ehrenberg, 1982) Kahl, 1932 , in the presence of a dorsal thorn (absent vs. present) ( Wu and Curds, 1979; Song and Wilbert, 1997).

Voucher slide. One slide of protargol-impregnated specimens was deposited at National Marine Biodiversity Institute of Korea (MABIK PR00043130).

Figures

Fig. 3. Aspidisca steini protargol impregnated specimen(A, B). A. Ventral view of typical individual. B. Dorsal view. 1-4, dorsal kinety1-4. Scare bar=20 μm.