This is from Fishbase:
Protopterus aethiopicus:
Smooth, slimy, cylindrical body with deeply embedded scales (Ref. 28714). Tail pointed and confluent with the long dorsal and anal fins; dorsal fin originating at an equal distance from the eye and the vent, or nearer to the latter; pectoral and pelvic fins slender and filamentous (Ref. 34290). 55-70 scales in a longitudinal series from immediately behind the head to above the vent; 40-50 scales around body (Ref. 4903, Ref. 45485). Ribs: 37-40 pairs (Ref. 4903). The dentition consisting of upper and lower tooth-plates in the form of sharp cutting ridges (Ref. 34290). Young fishes with true external gills, but usually absent in specimens greater than 15 cm TL (Ref. 34290). Dark slate-grey above, yellowish-grey or pinkish below; often with numerous dark spots or flecks on the fins and body (some specimens bright yellow ventrally); sensory canals on head and body are outlined in black (Ref. 34290).
Protopterus annectens:
Prominent snout; small eyes, its diameter 9-15 times in the head length (Ref. 2834). Paired fins long and filamentous (Ref. 367). Pectoral fins with a basal fringe are about 3 times the head length; pelvic fins are about 2 times the head length (Ref. 2834). In general 3 external gills inserted posterior to the gill slits and above pectoral fins (Ref. 2834). 40-50 scales between operculum and anus, 36-40 around the body before dorsal-fin origin (Ref. 2834). 34-37 pairs of ribs (Ref. 41467). Cycloid scales embedded in the skin (Ref. 3023). Dorsal side olive or brown colored, ventral side lighter; great blackish or brownish spots on the body and fins except on the belly (Ref. 367).
