Fig. 1
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Fig. 2
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Fig. 3
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Fig. 4
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Fig. 5
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1A. CAUDAL PEDUNCLE ELONGATE (ITS DEPTH 21-28% OF ITS LENGTH) (FIG. 1A) ....................STOMATORHINUS PUNCTICULATUS
1B. CAUDAL PEDUNCLE SHORTER (DEPTH GREATER THAN 28% OF ITS LENGTH) (FIG. 1B) ....................................................... 2
2A. EYE DIAMETER APPROXIMATELY 4 TIMES INTO POSTORBITAL LENGTH .................... STOMATORHINUS SCHOUTEDENI
2B. EYE DIAMETER 5 OR MORE TIMES INTO POSTORBITAL LENGTH
....................3
3A. CAUDAL FIN LOBES ROUNDED (FIG. 2A)
....................4
3B. CAUDAL FIN LOBES OBTUSELY POINTED (FIG. 2B)
....................6
4A. SNOUT TRUNCATE (FIG. 2C). LATERAL LINE WITH 54-64 SCALES AND 45-55 PORES. 20-22 CIRCUMPEDUNCULAR SCALES. DARK PURPLISH BROWN BODY COLORATION, LIGHTER VENTRALLY (FIG. 2D), FINS GRAY
....................STOMATORHINUS POLYLEPIS
4B. SNOUT ROUNDED (FIG. 2E) ....................5
5A. HEAD WIDTH LESS THAN 75% HEAD DEPTH (FIG. 3). LATERAL LINE WITH 44-51 SCALES AND 12-17 PORES. 12-14 CIRCUMPEDUNCULAR SCALES. UNIFORMLY BROWN BODY AND FINS
....................STOMATORHINUS FULIGINOSUS
5B. HEAD WIDTH MORE THAN 80% HEAD DEPTH (FIG. 3). LATERAL LINE WITH 48-53 SCALES AND 46-50 PORES. 16-18 CIRCUMPEDUNCULAR SCALES. BODY COLORATION VARIABLE, FROM PALE PINK TO BROWN OR BLACK
....................STOMATORHINUS MICROPS
6A. NINE TEETH ON UPPER AND 10 ON LOWER JAWS. OPERCULAR CLEFT S-SHAPED (FIG. 4A)
STOMATORHINUS CORNETI
6B. SEVEN TEETH ON UPPER AND 8 TEETH ON LOWER JAWS. OPERCULAR CLEFT CURVED (FIG. 4B)
....................7
7A. 14-16 CIRCUMPEDUNCULAR SCALES. ORIGIN OF DORSAL FIN SLIGHTLY BEHIND ORIGIN OF ANAL FIN (FIG. 5A)......................STOMATORHINUS HUMILIOR
7B. 12-14 CIRCUMPEDUNCULAR SCALES. ORIGIN OF DORSAL FIN MORE-OR-LESS OPPOSITE ORIGIN OF ANAL FIN (FIG. 5B)....................STOMATORHINUS KUNUNGUENSIS
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