Testudinella brevicaudata Yamamoto, 1951

Song, Min Ok & Lee, Chang-Ho, 2021, New records of three monogonont and seven bdelloid rotifers from Korea, Journal of Species Research 10 (4), pp. 392-404 : 395

3. Testudinella brevicaudata Yamamoto, 1951 ( Fig. 3 )

ḇȇ꼬qģnjÊệ (ṵḋ) Testdudinella brevicaudata Yamamoto, 1951, p. 161 , figs.

10-12; Koste, 1988, p. 131, fig. 35; Sharma, 1990, p.

31, fig. 3; Sharma and Khan, 2016, p. 8, fig. 18.

Material examined. One specimen found at Gyeongpo wetland area, Gangneung-si, Gangwon-do, 37°47′19.9″N, 128°53′49.8″E, 21 October 2018.

Diagnosis. Lorica dorsoventrally flattened and slightly elliptical in dorsal/ventral view. Anterodorsal margin slightly concave and with a small and low triangular lobe medially. Anteroventral margin slightly concave and with V-shaped median notch. Anteroventral and anterodorsal margins coincide except the median areas. Foot opening at the end of ventral plate. Posterior part of lorica extended and forming a short and tubular sheath around foot opening; posterodorsal margin of the sheath protruding beyond the posterior margin of lorica.

Measurements. Lorica width 117 μm. Lorica length 134 μm. Head aperture width 50 μm. Foot opening width 18 μm.

Remarks. This species has been reported from Argentina, Brazil, Cambodia, India, Thailand, Vietnam and West Africa since the original description from Japan by Yamamoto (1951) ( Sharma, 1990; Sanoamuang, 1998; Koste, 1999).

The general morphology of the Korean specimen is consistent with the original description. The shape of the anterior margins and the sheath around the foot opening has some variation ( Jersabek and Leitner, 2013). The morphology of the anterior margins and the posteroventral sheath of the Korean specimen was most similar to those of specimens reported by Koste (1988) as well as Sharma and Khan (2016).

World distribution. Argentina, Brazil, Cambodia, India, Japan, Thailand, Vietnam and Korea.

Deposition. Deposited in the collection of the National Institute of Biological Resources, Incheon, Korea ( ZCIVIV 0000002806 ) .

Figures

Fig. 3. Testudinella brevicaudata Yamamoto, 1951.A, B. lorica in different focal planes(Scales:A, B=50μm).