Arcuseries warreni

Min, Kang-San Kim and Gi-Sik, 2018, Brief morphological description of stichotrichid ciliates (Ciliophora: Stichotrichia) from Korea, Journal of Species Research 7 (4), pp. 323-332 : 324

2. Arcuseries warreni (Song & Wilbert, 1997)

Huang et al., 2014 ( Fig. 2 )

Material examined. Seawater (28.8 ‰) from Incheon Port, Korea (37°26ʹ57ʺN, 126°35ʹ37ʺE), on May 2018 .

Diagnosis. Cell size 65-80 × 25-30 μm in protargol preparations, oval shape, and flexible; adoral zone 32% of body length, 28-30 adoral membranelles; 43-60 macronuclear nodules; conspicuous cortical granules arranged around dorsal bristles, erythrocytes-like granules densely distributed in cytoplasm; 3 frontal and 2 frontoterminal cirri; 1 buccal cirrus; 7-9 midventral pairs; 10- 12 transverse cirri and 2 pretransverse ventral cirri; 1 left (20-25 cirri) and 1 right (20-27 cirri) marginal cirral row; 3 dorsal kineties; hair-like ejected granules present; caudal cirri lacking.

Remarks. Arcuseries warreni can be easily distinguished from other Arcuseries species by conspicuous erythrocyte-like granules and hair-like ejected granules. In the Korean population of A. warreni , cortical granules were mainly arranged along with cirri, and around dorsal bristles ( Fig 2B, C ).

Deposition. Two slides (NIBRPR0000109459, NIBRPR0000109450) have been deposited at the National Institute of Biological Resources (NIBR), South Korea.

Figures

Fig. 2. Photomicrographs of Arcuseries warreni from life (A-D) and after protargol impregnation (E, F). (A) Ventral view. (B) Cirri (arrows) and cortical granules (arrowheads) on ventral surface. (C) Bristles (arrows) and cortical granules (arrowheads) on dorsal surface. (D) Erythrocytes-like granules. (E) Arrow indicates hair-like ejected granules. Scale bars=50 μm.