Proalinopsis caudatus ( Collins, 1873 )

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 : 27-28

3. Proalinopsis caudatus ( Collins, 1873) ( Fig. 2)

Notommata caudata Collins, 1873, p. 11 , figs. 8a, b.

Proalinopsis caudatus : Weber and Montet, 1918, pp. 98-99; Harring and Myers, 1922, pp. 608-610, pl. 52, figs. 1-5; Koste, 1978, p. 267, T. 87: 4a-f, T. 88: 3a-m; Koste and Shiel, 1990, p 131, figs. 1: 3a-e; De Smet, 1996, pp. 19-20, figs. 40-46, pl. 4: figs. 1-6.

Material examined. Two specimens found in wet leaf litter alongside a stream at Gyeryongsan, Gongju-si , Chungcheongnam-do, 36°20 ʹ 47.7 ʺ N 127°12 ʹ 22.9 ʺ E, 7 May 2016 .

Diagnosis. Body spindle-shaped and slender. Cuticle delicate. Head offset by transverse fold. Corona oblique. Foot with 2-4 pseudosegments and about 1/7-1/5 of total length. Posterodorsal part of first foot pseudosegment with a short cylindrical projection bearing a long seta. Trophi virgate. Unci with 7-8 large and clubbed teeth.

Measurements. Total body length 204 μm. Greatest trunk width 59 μm. Foot length 28 μm. Toe length 18 μm.

Remarks. Even though this species has a wide distribution, it is new to Asian fauna.

The genus Proalinopsis Weber, 1918 is new to the Korean fauna. In Proalinopsis , only six species have been described to date globally ( De Smet, 1996; Jersabek and Leitner, 2013).

World distribution. Probably cosmopolitan ( De Smet, 1996).

Deposition. Deposited in the collection of the National Institute of Biological Resources, Incheon, Korea (ZII YIV0000001553, ZIIYGR0000000005).