Scepanotrocha simplex De Koning, 1947

Song, Min Ok & Lee, Chang-Ho, 2021, New records of three monogonont and seven bdelloid rotifers from Korea, Journal of Species Research 10 (4), pp. 392-404 : 400-401

9. Scepanotrocha simplex De Koning, 1947 ( Fig. 9 )

ḪṘȘḨĒÊệ (ṵḋ)

Scepanotrocha simplex De Koning, 1947, p. 186 , pl. 1, fig. 2; Donner, 1965, pp. 103, 104, fig. 78j.

Material examined. Two specimens sorted out from leaf litter and soil at Gyeongpo Wetland, Unjeong-dong, Gangneung-si, Gangwon-do, 37°47′32.0″N, 128°54′14.2″ E, 3 June 2021.

Diagnosis. Corona much narrower than cingulum. Sulcus very narrow. Pedicel very short. Median lobe of upper lip long semicircle-shaped; anterior margin of median lobe rather flat and with a small projection medially; as high as trochal discs; covers more than half of corona. Cingulum pad with parallel lateral margins. Pharyngeal tube as long as trophi in feeding. Spurs conical and without interspace; inner margin slightly plump proximally.

Measurements. Corona width 21 μm. Cingulum width 24 μm. Cingulum pad width 29 μm. Greatest trunk width in feeding 63 μm. Spur length 7.7 μm.

Remarks. The hood-like membranous expansion of the upper lip is semicircular, with a small median projection, and covering the corona completely in the original description of this species, while it is much smaller in the Korean specimens, and looks like a long semicircle-shaped median lobe on the upper lip. The median lobe is as high as the trochal discs and covers more than half of corona. The feeding head shape of the Korean specimen was most similar to that of a variety reported from Austria ( Donner, 1965, Fig. 78j).

Scepanotrocha simplex has been reported from Austria, Belgium, Greece and New Zealand ( Donner, 1965) after its description from the Netherlands by De Koning (1947). It is reported from Asia for the first time by the present study.

Partial mtCOX1 was amplified using DNA extracted from one specimen of Scepanotrocha simplex . One sequence (616 bp in length) was obtained and submitted to GenBank under accession number MZ677126 .

World distribution. Austria, Belgium, Greece, Korea and New Zealand.

Deposition. Deposited in the collection of the National Institute of Biological Resources, Incheon, Korea ( VSJAIV 0000000545 ) .

Figures

Fig. 9. Scepanotrocha simplex De Koning, 1947.A. feeding head and neck, dorsal view; B. feeding, dorsal view; C. feeding, dorsal view (Scales: A=25 μm; B, C=50 μm).