Adineta gracilis Janson, 1893

Song, Min Ok, 2014, Eight new records of monogonont and bdelloid rotifers from Korea, Journal of Species Research 3 (1), pp. 53-62 : 55-58

4. Adineta gracilis Janson, 1893 ( Fig. 2A )

Adineta gracilis Janson, 1893, p. 77 , pl. 5, figs. 76, 77;

A B G

Montet, 1915, p. 262, pl. 7, figs. 1a, b; Bartos ˇ, 1951, p. 477, figs. 4B, 66D, H; Bartos ˇ, 1959, p. 309, figs. 57 D-E; Donner, 1965, p. 274, figs. 199g-j.

Material examined. 8 specimens, a mountain in Jukheondong, Gangneung-si, Gangwon-do (moss and lichens, Chang-Ho Lee), 07 March, 2013.

Description. Eyes absent. Head oval, flat and thumbshaped. Rostrum lamella like brim of hat, with even height

A B

and without auricle-like structure laterally, incurved ventrally. Corona a ventral ciliary field and non-retractable. Rake apparatus absent. Two thin and long spine-like projections present anterior to mouth; each tip curved and pointing up. Integument around posterior part of ventral ciliary field and mouth extended like lamella forming rhomboidal collar-shaped structure. Dental formula 2/2. Preanal segment much narrower than preceding segment of trunk. Anal segment gradually tapering to foot. Foot narrower than rump. Spurs small, triangular and decurv- ed towards end. Three toes small.

Body length 256 μm. Trunk width 41 μm.

Distribution. Europe, Australia, New Zealand, Pacific Islands, the Antarctic, South and North America, and Korea.

Remarks. Cosmopolitan, but, new to Asia.

Figures

Fig. 2. A. Adineta gracilis Janson, 1893, ventral view. Macrotrachela timida timida Milne, 1916. B. creeping, dorsal view. C. feeding, dorsal view. D. rump, foot and spurs, dorsal view (Scales: A=50μm; B-C=20 μm).