A new species and ten new records of bdelloid rotifers from Korea Author Song, Min Ok Author Min, Gi-Sik text Zootaxa 2015 3964 2 211 227 journal article 10.11646/zootaxa.3964.2.3 f05e719c-e858-4d08-8614-d747396a2072 1175-5326 245421 63400B31-A395-4670-AAA2-8C7CEBD9D464 Habrotrocha acornis Murray, 1911 Figure 4 Material. Two specimens found in mushrooms growing on tree trunks at Gosu-ri, Danyang-gun, Chungcheongbuk-do, September 22, 2013 . This species is relatively rare and has previously been reported only from Brazil ( Murray 1913 ), since its original description from tropical Africa by Murray (1911) . The characteristics of the Korean specimens agree well with those of the type specimens. H. acornis is distinguishable from its congeners by the following characteristics: (1) the upper lip is arched with a thick and wavy margin, much lower than the sulcus, and with each side extended like an auricle; (2) the pseudosegment around the trophi is much wider than both the previous and the following pseudosegments, and has a trapezoidal outline, which is maintained during feeding; and (3) the sulcus has a large conical projection medially. According to the original description, it was never observed in a nest or tube, although many characteristics indicated that the species was a tube-dweller ( Murray 1911 ). In the present study, we did not observe any of the Korean specimens in nests or tubes. Measurements. Corona width 53 µm. Collar width 46 µm.