Spathidium curiosum Foissner and Xu, 2016

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 : 65

2. Spathidium curiosum Foissner and Xu, 2016

( Figs. 1 D-G)

Material examined. Mt. Goesan , Goesan-gun, Cungcheongbuk-do, Korea (36°48 ʹ N, 127°57 ʹ E), September 5, 2015 .

Diagnosis. Size about 125 × 25 μm in vivo, 70-120 × 12- 19 μm after impregnation; oral bulge oblong, obliquely narrowly spatulated, about 2/3 of body width; cortical granules arranged between somatic kinety rows; marcronuclear nodule, long and highly tortuous; micronuclei, 4-8; one contractile vacuole; extrusomes, fusiform developmental stage impregnates with protargol; mature oral bulge extrusomes in vivo rod-shaped to acicular; 20-24 somatic kineties, three anteriorly differentiated to form a dorsal brush.

Voucher slides. A slide of protargol-impregnated specimens was deposited at the Nakdonggang National Institute of Biological Resources, Korea (NNIBRIV5).

Remarks. Spathidium curiosum can be distinguished from congeners by the curious shape of the extrusomes (toxicysts) ( Foissner, 2016).