Anguilla interioris Whitley, 1938

Lin, Yen-Ting & Han, Yu-San, 2024, Species diversity of freshwater glass eel (Anguilliformes, Anguillidae) of Yilan, Taiwan, with remark on two new records, ZooKeys 1220, pp. 5-14 : 5-14

Anguilla interioris Whitley, 1938

Figs 1 , 2 , Table 3

Material examined.

NTUIFS IL 13’0812-76 , 46 mm TL, off the estuary of the Yilan River , Yilan, northeastern Taiwan (24.7162 ° N, 121.8352 ° E), 12 August 2013, fyke net, collected by Yu-San Han .

Short description.

PDL 29.3 % in TL; PAL 39.1 % in TL; fin-difference ratio 9.78 %. Body elongate, head length 13.1 % TL. The specimen was in fresh condition, with black pigment distributed on the caudal fin and slightly on the caudal peduncle; pigmentation stages V B 2 (Fig. 2 ).

Distribution.

New Guinea ( Aoyama et al. 2000); Philippines (glass eel only, Wibowo et al. 2021); Indonesia (leptocephalus only, Kuroki et al. 2006; all stages, Zan et al. 2022); Taiwan (glass eel only, present study).

Remarks.

The distribution of A. interioris has been primarily known from only New Guinea ( Aoyama et al. 2000). However, a study by Kuroki et al. (2006) documented the leptocephalus of A. interioris in the Indonesian Archipelago, marking the first expansion of the species beyond its then-known range. Additionally, records of A. interioris have been identified using DNA sequencing from Indonesia and southern Mindanao, Philippines ( Wibowo et al. 2021; Zan et al. 2022). Herein, we present the first record of A. interioris glass eel from Taiwan.

Figures

Figure 1. Anguilla interioris (NTUIFS IL 13 ’ 0812-76), 46 mm TL. Preserved in 95 % alcohol. Scale bar: 10 mm.

Figure 2. Pigmentation on the tail tip of Anguilla interioris (NTUIFS IL 13 ’ 0812-76).