Dexiostoma campylum (Stokes, 1886) Jankowski,, 1967

Jung, Atef Omar and Jae-Ho, 2021, New record of 21 ciliate species (Protozoa, Ciliophora) from South Korea, Journal of Species Research 10 (3), pp. 301-320 : 314

17. Dexiostoma campylum (Stokes, 1886) Jankowski,

1967 ( Fig. 16 )

Material examined. Terrestrial moss collected from

Mungyeong Saejae Provincial Park , Mungyeong-si, Gyeongsangbuk-do, Korea (36°45 ʹ 57 ʺ N, 128°4 ʹ 29 ʺ E) on 29 March 2020 .

Diagnosis. Body size about 55 × 20 μm after protargol impregnation (n = 3); body slender, length:width ratio 2-3: 1; 1 subterminal contractile vacuole; 1 globular to broadly ellipsoidal macronuclear nodule with a single micronucleus attached to it; buccal infraciliature tetrahymenid composed of paroral on right side of buccal cavity and 3 adoral membranelles; about 30 somatic ciliary rows.

Distribution. Cosmopolitan.

Remarks. The Korean population of Dexiostoma campylum agrees with previous descriptions, especially that of Ganner and Foissner (1989) in most characters. In their taxonomic study on the genus Dexiostoma, Ganner and Foissner (1989) revealed that the species Dexiostoma campylum was synonymized many times because of its similarity with the genera Paramecium , Tetrahymena , Colpidium , and Glaucoma ( Jankowski, 1967; Ganner and Foissner, 1989; Foissner et al., 1994). However, the variability of the number of somatic ciliature (16- 33) within populations could indicate cryptic species, as suggested by Ganner and Foissner (1989).

Voucher slides. One slide with protargol-impregnated specimens was deposited at the Nakdonggang National Institute of Biological Resources (NNIBRPR20132).

Figures

Fig. 16. Photomicrographs of Dexiostoma campylum after protargol impregnation (A, B). Ventral (A) and dorsal (B) view of the same specimen showing somatic ciliature, oral ciliature, and nuclear apparatus. Scale bar=20μm.