Anguilla borneensis Popta 1924

Anguilla borneensis Popta, 1924 Figs 3, 4, Table 3 Material examined. NTUIFS IL 21’0715-207, 49.5 mm TL, off the estuary of the Yilan River, Yilan, northeastern Taiwan (24.7162 ° N, 121.8352 ° E), 15 July 2021, fyke net, collected by Yen-Ting Lin. Short description. PDL 26.3 % in TL; PAL 36.4 % in TL; fin-difference ratio 10.1 %. Body extremely elongate, head length 10.1 % TL. The specimen was in fresh condition, with black pigment distributed on the caudal peduncle and caudal fin; pigmentation stages V A (Fig. 4). Distribution. Indonesia (Watanabe et al. 2014); Taiwan (glass eel only, present study). Remarks. The best-matched GenBank accession number for NTUIFS IL 21 ’ 0715-207 was found to be NC _ 006536.1, which corresponds to A. malgumora submitted by Minegishi et al. (2005). However, it is noteworthy that A. malgumora was identified as a junior synonym of A. borneensis by Minegishi et al. (2005). Based on the comprehensive examination by Minegishi et al. (2005) and the detailed description provided in NC _ 006536.1, we can confidently affirm that our specimen NTUIFS IL 21 ’ 0715-207 is A. borneensis. Herein, we report the first record of A. borneensis outside of the Indonesia (Watanabe et al. 2014).