Holostichides dumonti Foissner, 2000

Min, Kang-San Kim and Gi-Sik, 2018, New records of nine ciliates (Protozoa: Ciliophora) from Korea: Brief descriptions and remarks, Journal of Species Research 7 (4), pp. 315-322 : 316-318

3. Holostichides dumonti Foissner, 2000 ( Fig. 3 )

Material examined. Soil sample taken from Wangsan-ri, Jung-gu, Incheon, South Korea (37°26 ʹ 47 ʺ N 126°23 ʹ 40 ʺ E) on February 2018 .

Diagnosis. Cell size 130-140 × 30-35 μm in protargol preparations, elongated ellipsoidal, flexible; adoral zone about 30% of body length, 36-40 adoral membranelles; 60-62 macronuclear nodules; contractile vacuole at left mid-body; cortical granules colorless, arranged as longitudinal rows; 3 frontal and 2 frontoterminal cirri; 1 buccal cirrus; about 15 cirri in midventral pairs; 2 or 3 additional midventral row; transverse cirri lacking; 1 left (47-49 cirri) and 1 right (44-47 cirri) marginal cirral row; invariably 5 dorsal kineties.

Remarks. The Korean population follows most morphological features of the Finnish (type) population, though the former only differs from the latter by the number of macronuclear nodules (60-84 vs. 100-150) ( Berger, 2006). In comparison with its congeners, H. terrae can be separated from H. dumonti by the number of midventral rows (2 or 3 vs. 2) and the rod-shaped structure in the wall of the pharynx (present vs. absent) ( Jung et al., 2017a). The other Holostichides species ( H. chardezi , H. heterotypicus and H. typicus ) have a shorter undulating membrane compared to H. dumonti ( Kim et al., 2017) .

Deposition. Three voucher slides with protargol-impregnated specimens are deposited in the National Institute of Biological Resources in Korea (NIBRPR0000109441-NI BRPR0000109443).

Figures

Fig. 3. Photomicrographs of Holostichides dumonti from after protargol impregnation (A-D). (A) Arrow indicates caudal cirri. (B, C) Arrows indicate midventral cirral rows.(D) Dorsal view. 1-5, dorsal kineties. Scale bar=100 μm.