Zoothamnium plumula Kahl, 1933

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 : 312

24. Zoothamnium plumula Kahl, 1933 ( Fig. 24 )

Material examined. Brackish water (salinity 10‰) collected from Gyeongpocheon River , Unjeong-dong , Gangneung-si, Gangwon-do, Korea (37°47 ʹ 20 ʺ N, 128°54 ʹ 34 ʺ E) on July 13, 2017 .

Diagnosis. Colony height about 2100 μm; colony fan-like shape; alternatively branched; contractile stalk; zooid elongated bell-shaped, measuring 55-72 × 25-27 μm in vivo; single-layered peristomial lip width 38-40 μm; horizontal C-shaped macronucleus; one contractile vacuole dorsally located; transverse silverlines about 60 striations between peristomial lip and trochal band, about 25 striations between trochal band and scopula; two epistomial membranes; P1 and P2 consisted 3 kineties; P3 slightly separated inner row and outer two rows.

Distribution. China, Germany, Korea.

Remarks. The Korean population of Z. plumula is slightly different from the Chinese population in the colony shape (fan-like vs. feather-like) ( Song et al., 2002; Ji et al., 2009). The Korean population is possibly a well-developed form because the colony shape is sometimes changeable ( Ji et al., 2015).

Voucher slides. Two slides of protargol-impregnated specimens were deposited at National Institute of Biological Resources, Korea (NIBRPR0000109421, NIBRPR0000109422).

Figures

Fig. 24. Zoothamnium plumula in vivo(A, B) and after protargol impregnation(C, D). A. Colony shape. B. Zooids and branching patterns. C. Infundibular polykinety 1 (P1)(arrow), P2 (triangular arrowhead) and P3 (arrowhead). D. Haplo- and polykinety with epistomial membrane 1 (EM1)(arrow) and EM2(arrowhead) on apical view. Scale bars=1000 μm(A), 100μm (B).