Aspidisca aculeata (Ehrenberg, 1982) Kahl, 1932

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 : 183

2. Aspidisca aculeata (Ehrenberg, 1982) Kahl, 1932

( Fig. 2 )

Material examined. Brackish water (salinity 10.4‰) collected from Songji Lake , Oho­ri , Jugwang­myeon , Goseong­gun, Gangwon­do, Korea (38°20 ʹ 11 ʺ N, 128°30 ʹ 58 ʺ E) on April 28, 2017 .

Diagnosis. Marine Aspidisca , body about 30 × 30 μm in vivo, with 4 dorsal ridges and 1 thorn on second dorsal ridge; 7 frontoventral cirri polystyla­arrangement; 6 transverse cirri; 4 dorsal kineties; adoral zone of membranelles 1 composed of 4 membranelles; adoral zone of membranelles 2 composed of 13 membranelles.

Distribution. Cosmopolitan ( China, Germany, Korea).

Remarks. The Korean population of A. aculeata is slightly different from the Chinese population in the shape of the dorsal thorn (curved and pointed vs. keel­like). Aspidisca aculeata differs from the most similar species A. turrita (Ehrenberg, 1831) in the dorsal ridges (present vs. absent) (Wu and Curds, 1979; Li et al., 2008).

Voucher slides. Two slides of protargol impregnated specimens were deposited at National Institute of Biological Resources, Korea (NIBRPR0000107964).

Figures

Fig. 2. Aspidisca aculeata after protargol impregnation.A, B. Ventral and dorsal view of typical individual.Arrow marks a curved and point­ ed thorn. Arrowheads indicate dorsal ridges. AZM1, 2, adoral zone of membranelles 1, 2; DB, dorsal bristle; FVC, frontoventral cirri; TC, transverse cirrus. Scare bar: 20μm.