Frontonia schaefferi Bullington, 1939

Lee, Sue Yeon, Yoo, Jung Sun & Kim, Seung Tae, 2017, Morphology of one Frontonia and two Spathidium ciliates (Ciliophora: Intramacronucleata) from Korea, Journal of Species Research 6, pp. 63-66 : 63-65

1. Frontonia schaefferi Bullington, 1939 ( Figs. 1 A-C)

Material examined. Dutasan Recreational Forest , Jinbu-myeon , Pyeongchang-gun, Gangwon-do, Korea (37° 35 ʹ N, 127°34 ʹ E), May 28, 2017 .

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Diagnosis. Size about 89-112 × 45-53 μm after impregnation; body shape elliptical, anterior end broad, posterior end slightly narrowed, 2: 1 ratio of body length and width; extrusomes spindle-shaped and densely arranged beneath pellicle; buccal field about 21% of body length; about 67 somatic kineties; three vestibular and five postoral kineties; one ellipsoidal marcronucleus; one contractile vacuole.

Voucher slides. A slide of protargol-impregnated specimens was deposited at the Nakdonggang National Institute of Biological Resources, Korea (NNIBRIV4).

Remarks. The Korean population of Frontonia schaefferi closely resembles the Chinese population described by Pan et al. (2013), except for the ratio of length: width of the body (2: 1 vs. 3: 1).