Habrotrocha flava Bryce, 1915

Lee, Sue Yeon, Yoo, Jung Sun & Kim, Seung Tae, 2017, New records of 13 rotifers including Bryceella perpusilla Wilts et al., 2010 and Philodina lepta Wulfert, 1951 from Korea, Journal of Species Research 6, pp. 26-37 : 29-31

5. Habrotrocha flava Bryce, 1915 ( Fig. 3)

Habrotrocha flava Bryce, 1915, pp. 639-640 , pl. 38, fig. 3; Bartoš, 1951, p. 306, figs. 14E, F; Donner, 1965, p. 81, figs. 61e-f.

Material examined. One specimen found in wet leaf litter alongside a stream at Daegwallyeong, Pyeongchang-gun, Gangwon-do, 37°41 ʹ 19.7 ʺ N 128°45 ʹ 39.0 ʺ E, 5 June 2016.

Diagnosis. Corona slightly wider than cingulum and as wide as cingulum pad. Disc restractor prominent and V-shaped with convex sides. Sulcus very narrow. Upper lip arched and much lower than trochal discs. Head and neck long. Pharyngeal tube long with loops and twice as long as trophi length. Lateral margins of antenna pseudosegment swollen. Teeth 7/7. Spurs conical, very short and with wide interspace.

Measurements. Total body length in feeding 230 μm. Total body length in creeping 305 μm. Corona width 31 μm. Cingulum width 26 μm. Cingulum pad width 32 μm. Spur length 5 μm.

Remarks. This species is similar to H. flaviformis De Koning, 1947 ; however, these two species can be distinguished by the following characteristics: (1) the head and neck of H. flaviformis are much longer than those of H. flava , (2) the pharyngeal tube of H. flaviformis is three times as long as its trophi length, while that of H. flava is about twice its trophi length, and (3) the teeth formula of H. flaviformis is 5/5, while that of H. flava is 7/7.

The characteristics of the Korean specimen are consistent with the original description except that the interspace between spurs is very narrow in the Korean specimen, while it is wide and convex in the type specimens.

This species has been reported from several countries in Europe, New Zealand and North America. The present study is the first Asian record of this species.

World distribution. Europe, New Zealand, North America ( Donner, 1965; Jersabek and Leitner, 2013) and Korea.

Deposition. In a permanent slide, deposited in the collection of the National Institute of Biological Resources, Incheon, Korea ( ZIIYIV0000001545 ) .