Trachelostyla pediculiformis ( Cohn, 1866 )

Kim, Ji Hye, Omar, Atef & Jung, Ji Hye Moon and Jae-Ho, 2020, Taxonomy of 16 indigenous ciliate species (Protozoa, Ciliophora) from South Korea, Journal of Species Research 9 (4), pp. 427-442 : 433-434

7. Trachelostyla pediculiformis ( Cohn, 1866)

Borror, 1972 ( Fig. 7 )

Material examined. Marine water with some debris (salinity, 29.4‰) collected from Anin Beach , Gangdong-myeon , Gangneung-si, Gangwon-do, Korea (37°44′4.7″N 128°59′24.2″E) on 15 Jan 2019 .

Diagnosis. Body size in vivo about 80-140 × 25-40 μm (n = 5); bipartite with ellipsoidal trunk and a neck structure; cell flexible but not contractile; fusiform cortical granules distributed on ventral and dorsal side in short rows containing 1-4 granules; nuclear apparatus consists of 10-12 macronuclear nodules and 2-3 micronuclei;18 frontoventral transverse cirri.

Distribution. Worldwide.

Remarks. The Korean population of Trachelostyla pediculiformis agrees with other populations of T. pediculiformis . However, the Korean population is more similar to the type population ( Cohn, 1866) because both have cortical granules, unlike the Chinese population ( Gong et al., 2006). It should be noted that the cortical granules were not recognizable in the fresh samples and could only be observed after three months of cultivation.

Voucher slides. Two slides with protargol-impregnated specimens were deposited at National Institute of Biological Resources (NIBRPR0000110203, NIBRPR0000110 204).

Figures

Fig. 7. Photomicrograph of Trachelostyla pediculiformis in vivo (A, B) and after protargol impregnation (C, D). A. Typical body shape in vivo and reddish cytoplasmic inclusions and the rod-shaped cortical granules (arrow). B. Dorsal side with cortical granules (arrows) and dorsal bristles. C. Ventral ciliature. D. Ventrolateral view showing the ventral ciliature and the caudal cirri. TC, transverse cirri. Scale bars=30 μm.