Auchenoglanis, Gunther, 1865

Retzer, Michael E., 2010, Taxonomy of Auchenoglanis Günther 1865 (Siluriformes: Auchenoglanididae), Zootaxa 2655 (1), pp. 25-51 : 49-50

Key to the Species of Auchenoglanis

1. Origin of adipose fin over anal-fin origin ....................................................................................................... A. sacchii

-. Origin of adipose fin anterior to anal-fin origin .......................................................................................................... 2

2. Anterior margins of nuchal plates strongly curved ( Fig. 1b ); premaxillary tooth patches round ( Fig. 2b ) ................... ................................................................................................................................................................... A. biscutatus

-. Anterior margins of nuchal plates straight to slightly curved ( Fig. 1a ); premaxillary tooth patches not round ( Fig. 2a, c–e )................................................................................................................................................................................ 3

3. Small irregularly shaped spots of various size and intensity on body and adipose fin of adult; large adult has six vertical pairs of small but evenly spaced prominent spots beginning under dorsal fin and ending on caudal peduncle just above lateral line ................................................................................................................................... A. tanganicanus

-. Medium-sized spots in regular pattern or no spots on body and adipose fin of adult; no paired vertical spots on body of large adult ................................................................................................................................................................. 4

4. Body and fins of adult with medium-sized spots in a reticulated pattern; %MxBL/HL> 53.2 ....................... A. wittei

-. Body and fins of adult not with medium-sized spots in a reticulated pattern; %MxBL/HL <53.2 ............................ 5

5. Premaxillary tooth patches triangular or tear-shaped ( Fig. 2d–e ) ............................................................................... 6

-. Premaxillary tooth patches oblong-oval ( Fig. 2a ) ........................................................................................................ 7

6. Premaxillary tooth patches tear-shaped ( Fig. 2d ); adult with three horizontal series of dark spots on body and intense dark spots on fins; lips thin ........................................................................................................................... A. senegali

-. Premaxillary tooth patches triangular ( Fig. 2c ); adult without three horizontal series of dark spots and intense dark spots on fins; lips thick ........................................................................................................................... A. tchadiensis

7. External and internal mandibular barbels dark; adult body spotted .......................................................... A. acuticeps

-. External and internal mandibular barbels white; adult body plain ........................................................ A. occidentalis

Figures

FIGURE 1. Diagrams of nuchal plate patterns of Auchenoglanis. a) leading edge straight, b) leading edge curved. The arrow indicates the anterior end of the plates. The numbers indicate individual plates.

FIGURE 2. Diagrams of the five types of premaxillary tooth patches of Auchenoglanis. a) oblong-oval, b) round, c) square, d) tear, and e) triangle. The arrow indicates the direction of the anterior end of the patches.