Fig. 1
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1A. PECTORAL FIN REACHES LEVEL OF FIRST DORSAL FINLET OR IS SEPARATED FROM IT BY A DISTANCE OF LESS THAN
ONE FIN LENGTH (FIG.1A)....................2
1B. PECTORAL FIN DISTANT LEVEL OF FIRST DORSAL FINLET AND IS SEPARATED FROM IT BY A DISTANCE OF AT LEAST TWO FIN LENGTHS (FIG.1 B,C) ....................4
2A. 40 OR FEWER SCALE ROWS AROUND BODY AT LEVEL OF FIRST DORSAL FINLET, 6-8 ANGLED DARK BARS EXTENDING BELOW DORSAL MID-LINE, JAWS EQUAL OR UPPER JAW SLIGHTLY LONGER THAN LOWER (FIG. 1B)....................POLYPTERUS DELHEZI
2B. 44 OR MORE SCALE ROWS AROUND BODY AT LEVEL OF FIRST DORSAL FINLET, COLORATION NOT DOMINATED BY PRESENCE OF DARK BARS EXTENDING BELOW MIDLINE....................3
3A. UPPER JAW LONGER THAN LOWER (FIG. 1C), BLACK SPOT AT PECTORAL FIN BASE (FIG. 1B), 20-26 PREDORSAL SCALES....................POLYPTERUS WEEKSII
3B. LOWER JAW LONGER THAN UPPER (FIG. 1A), NO BLACK SPOT AT PECTORAL FIN BASE, 12-14 PREDORSAL SCALES....................POLYPTERUS CONGICUS
4A. PECTORAL FIN SEPARATED FROM FIRST DORSAL FINLET BY ABOUT TWO PECTORAL FIN LENGTHS (FIG. 1C), PECTORAL FIN HEAVILY STRIPED (FIG. 1C), DORSAL, PELVIC AND
ANAL FINS STRONGLY SPOTTED....................POLYPTERUS ORNATIPINNIS
4B. PECTORAL FIN SEPARATED FROM FIRST DORSAL FINLET BY 3 OR MORE FIN LENGTHS (FIG. 1B), PECTORAL FINS NOT HEAVILY STRIPED....................5
5A. 52-55 SCALES IN LONGITUDINAL SERIES, 5-6 (RARELY 7) DORSAL FINLETS, NO CLEAR DELIMITATION BETWEEN DARKER DORSO-LATERAL COLORATION AND PALER VENRUM ....................POLYPTERUS POLLI
5B. 56-58 SCALES IN LONGITUDINAL SERIES, 7-9 DORSAL FINLETS, CLEAR DELIMITATION BETWEEN DARKER DORSO-LATERAL COLORATION AND PALE VENRUM....................POLYPTERUS RETROPINNIS*
* THE RECENTLY DESCRIBED POLYPTERUS MOKELEMBEMBE HAS NOT YET BEEN RECORDED FROM THIS AREA. IT IS DISTINGUISHED FROM P. RETROPINNIS, THE SPECIES IT MOST CLOSELY RESEMBLES, BY THE POSSESSION OF A WIDER FIRST DORSAL SPINE (6.4-8.1 VS. 4.6-6.1% HL), AND FEWER PECTORAL RAYS (23-39 VS. 30-34).
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