Macrotrachela timida inquies Milne, 1916

Song, Min Ok, 2014, Eight new records of monogonont and bdelloid rotifers from Korea, Journal of Species Research 3 (1), pp. 53-62 : 59

6. Macrotrachela timida inquies Milne, 1916 ( Fig. 3 C-E)

Macrotrachela timida inquies Milne, 1916, pp. 154-155 , pl. 10, Fig. 4 ; Bartoˇs, 1959, pp. 251-252, figs. 38M, O; Donner, 1965, pp. 155-156, fig. 114c; Donner, 1972, pp. 104-105, figs. 9l; Donner, 1980, p. 139, fig. 5d.

Material examined. 5 specimens, Wanggok-ri, Goseonggun, Gangwon-do (mosses on a tree trunk, Min Ok Song), 15 Sep., 2013.

Description. Body with smooth surface. Rostral lamella wider than rostrum end and quadruple-lobed; lateral lobes bigger than median ones and like auricles. Corona wider than cingulum pad. Upper lip rimmed, as high as disc retractor, with somewhat concave sides and with arched median lobe. Dental formula 2/2. Rump ‘crinoline-type’ and with two deep longitudinal folds in the middle dorsally; dorsal expansion of anal segment not as prominent as that of M. timida timida . Foot with four segments and three toes; first foot segment with a transverse protuberance dorsally. Spurs conical, divergent, as long as spur segment width; inner margin somewhat swollen like a shoulder until 1/3 from base and then gradually tapering to narrow end; interspace slightly narrower than spur base width.

Corona width 49 μm. Cingulum pad width 41 μm. Spur length 15 μm.

Distribution. South Africa, Austria, Czech Republic, Spain, Brazil and Korea.

Remarks. The present subspecies is different from M. timida timida as follows: (1) It has a transverse protuberance on the first foot segment dorsally, while M. timida timida does not have any dorsal bump or projection on foot; (2) The dorsal expansion of anal segment is not as noticeable as that of M. timida timida ; (3) Spurs of the present subspecies is as long as its base width, while those of M. timida timida are longer than spur base width. New to Asia.

Figures

Fig. 3. Habrotrocha scabropyga Bartos ˇ, 1958. A. creeping, dorsal view. B. feeding, dorsal view. Macrotrachela timida inquies Milne, 1916. C. feeding, dorsal view. D. rump, foot and spurs, dorsolateral view. E. rostrum and neck, dorsal view(Scales: A-C=50μm; D=20 μm).

Fig. 4. Habrotrocha pavida Bryce, 1915. A. creeping, dorsal view. B. creeping, lateral view. C. feeding head and neck, dorsal view. D. spurs and toes, ventral view (Scales: A-C=50 μm; D=20μm).