Keronopsis polychaeta ( Borror, 1966 )

Min, Mi-Hyun Park and Gi-Sik, 2019, New records of one marine and two soil ciliates (Ciliophora: Intramacronucleata) from Korea, Journal of Species Research 8 (1), pp. 113-115 : 114

2. Keronopsis polychaeta ( Borror, 1966) Jankowski,

1979 q극fl각flậflḝ(신%) ( Fig. 1C, D )

Material examined. From moss-covered soil collected from Toseong-myeon , Goseong-gun, Gangwon-do, Korea (38°12 ʹ N, 128°30 ʹ E), October 21, 2017 .

Diagnosis. Cell size approximately 140-155 × 80-100 μm after protargol impregnation; ellipsoidal body outline, slightly cephalized, anterior and posterior ends slightly rounded; adoral zone occupied approximately 56% of body length, and composed of 42-50 adoral membranelles; 15-21 frontal coronal cirri; 4 frontoventral rows; 2 or 3 buccal cirri; left and right frontoventral rows with 22- 29 and 30-35 cirri, respectively; left and right marginal rows composed of 29-32 and 29-38 cirri, respectively; 5-7 transverse cirri; 3 dorsal kineties; 2 ellipsoidal macronuclear nodules and 2 or 3 micronuclei.

Voucher slide. A slide of protargol-impregnated specimens has been deposited at the National Institute of Biological Resources, Korea (NIBRPR0000109475).

Remarks. Keronopsis polychaeta was originally described as Paraholosticha polychaeta by Borror (1966), but was subsequently transferred to the genus Keronopsis on the basis of the presence of transverse cirri by Jankowski (1979). Although the Korean population of K. polychaeta is morphologically identical to the American population, they differ in terms of the habitat from which they were collected (moss-covered soil vs. tidal marsh pool, 3‰) ( Borror, 1966).

Figures

Fig. 1. Photomicrographs of three ciliates based on live observations (A) and after protargol impregnation (B-E). A, B, Apogonostomum pantanalense, ventral view of live (A) and protargol impregnated (B) specimens, arrows indicate tail-like posterior end; C, D, Keronopsis polychaeta, ventral view of protargol impregnated specimen, arrowheads in (D) denote frontoventral rows; E, Frontonia canadensis, ventral view of protargol impregnated specimen.AZM, adoral zone of membranelles; BC, buccal cirri; Co, frontal corona; EM, endoral membrane; FT, frontoterminal cirri; Ma, macronucleus; PM, paroral membrane; PTC, pretransverse cirri; TC, transverse cirri; VK, vestibular kineties. Scale bars=100μm (A, C), 50μm (B, E).