Drepanomonas pauciciliata Foissner, 1987

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 : 313

16. Drepanomonas pauciciliata Foissner, 1987 ( Fig. 15 )

Material examined. Terrestrial moss sample collected from Hambaeksan Mountain , Gohan-eup , Jeongseongun, Gangwon-do, Korea (37°9 ʹ 23.8 ʺ N, 128°54 ʹ 59.3 ʺ E) on 17 May 2018 .

Diagnosis. Size in vivo about 20 × 12 μm (n = 6); body semi ellipsoidal with ventral side distinctly convex; 1 macronucleus and 1 micronucleus; cortex rigid, right side smooth except of minute crenelation in ciliary pits; left side with longitudinal, deep and narrow furrow; contractile vacuole slightly posterior and dorsal to oral structures; cytopyge posterior and left to contractile vacuole; extrusomes lenticular and left of somatic kineties; 9 somatic and 3 preoral kineties, each kinety contains few dikinetids and few monokinetids with large gaps in the middle; preoral kineties contain 2 or 3 dikinetid each with a single monokinetid posteriorly; oral apparatus in mid-body containing oral membranelles and oral primordium.

Distribution. Cosmopolitan.

Remarks. The Korean population of D. pauciciliata is identical to the type population ( Foissner, 1987) in the size, shape, the ciliary pattern, and the deep, narrow furrow on the left side. Drepanomonas pauciciliata is most similar to D. revoluta Penard, 1922 , but differs mainly in the deep, narrow left side furrow (vs. two ridges forming a wide furrow in between in D. revoluta ). It is also similar to D. hymenofera hymenofera (Horvath, 1956) Omar and Foissner, 2013 in having a narrow furrow in the left side. However, they differ mainly in the body size (20 × 12 μm vs. 40 × 18 μm) and the highly reduced (vs. ordinary) number of somatic basal bodies, for instance, unlike D. h. hymenofera , D. pauciciliata lacks basal bodies in the second and third quarters of somatic kineties 3 and 4 ( Penard, 1922; Foissner, 1987; Omar and Foissner, 2013).

Voucher slides. One slide with protargol-impregnated specimens was deposited at the Nakdonggang National Institute of Biological Resources (NNIBRPR20131).

Figures

Fig. 15. Photomicrographs of Drepanomonas pauciciliata in vivo (A, B) and after protargol impregnation(C, D).A. right side view showing the crenelation in ciliary pits and the oral apparatus in mid-body. B. Left side view showing the deep narrow furrow. C. Right side ciliature. D. Left side ciliature. BC, buccal cavity; CV, contractile vacuole; F, furrow; MA, macronucleus; MI, micronucleus; PO, preoral kineties. Scale bars=10 μm.