Notoglanidium

Geerinckx, Tom, Vreven, Emmanuel, Dierick, Manuel, Hoorebeke, Luc Van & Adriaens, Dominique, 2013, Revision of Notoglanidium and related genera (Siluriformes: Claroteidae) based on morphology and osteology, Zootaxa 3691 (1), pp. 165-191 : 175

Key to species in Notoglanidium

1 Elongated post-anal region, resulting in a pre-anal body length of only 45.3–52.0% SL; 25–28 anal-fin rays..... N. depierrei

- Post-anal region shorter, with a pre-anal body length of 54.0–68.4% SL; 9–15 anal-fin rays........................... 2

2 Seven soft dorsal-fin rays............................................................................... 3

- More than eight dorsal-fin rays........................................................................... 5

3 Head and body extremely depressed, with pre-dorsal body depth 10.9–12.9% SL and maximal head depth 36.6–39.1% HL; 14 or 15 anal-fin rays.......................................................................... N. boutchangai

- Head and body moderately depressed, with pre-dorsal body depth 16.1% SL or more, and maximal head depth 45.9% HL or more; 10–13 anal-fin rays 4

4 Body moderately depressed, with pre-dorsal body depth 16.1–18.0% SL; large combined premaxillary tooth plate width (33.5– 41.7% HL); branchiostegal membranes free, not fused; spotted to banded colour pattern variable but always present................................................................................................. N. macrostoma

- Body relatively high, with pre-dorsal body depth 19.5–24.4% SL; narrower combined premaxillary tooth plate width (22.0– 26.1% HL); branchiostegal membranes completely fused; colour pattern may be dim or absent................... N. akiri

5 Combined premaxillary tooth plate width large (21.0–26.4% HL)..................................... N. pembetadi

- Combined premaxillary tooth plate width smaller (10.5–18.2% HL).............................................. 6

6 Broad interorbital distance (35.3–46.7% HL); 12–22 soft (branched) dorsal-fin rays; posterior fontanel present........... 7

- Narrower interorbital distance (20.0–33.3% HL); 7–15 soft (branched) dorsal-fin rays; no posterior fontanel............. 8

7 Large eye diameter (9.1–12.5% HL); broad interorbital distance (41.0–46.7% HL); dorsal fin with relatively long spine (4.6– 6.2% SL) and 12–16 soft rays; large pre-dorsal body depth (16.1–19.2% SL).............................. N. thomasi

- Smaller eye diameter (3.3–5.3% HL); narrow interorbital distance (35.3–36.8% HL); dorsal fin with relatively short spine (2.5–3.7% SL) and 16–22 soft rays; small pre-dorsal body depth (12.2–15.2% SL)........................ N. maculatum

8 Eye diameter large (7.8–10.6% HL); interorbital distance large (27.8–33.3% HL); 11–15 soft dorsal-fin rays; body brown with dark spots..................................................................................... N. walkeri

- Eye diameter minute (3.8–7.0% HL); interorbital distance smaller (20.0–23.3% HL); 8–10 soft dorsal-fin rays; body pallid pink....................................................................................... N. pallidum