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(1) | (i) Snout with proboscis | (2) |
(ii) Snout without proboscis | (7) |
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(2) | (i) Proboscis well-developed | (3) |
(ii) Proboscis incipient, represented by a truncate area in front of the nostrils | gravelyi |
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(3) | (i) Proboscis bilobed with one large | bispinosa |
(ii) Proboscis unilobed or quadrate | (4) |
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(4) | (i) Vent to anal distance more than 45% of pelvic to anal-fin distance | elongata |
(ii) Vent to anal distance less than 40% of pelvic to anal-fin distance | (5) |
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(5) | (i) Simple dorsal fin rays two | litanensis |
(ii) Simple dorsal fin rays four | (6) |
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(6) | (i) Lateral line scales 34; anus to anal distance 32.1–39.2% of pelvic to anal distance | rotundinasus |
(ii) Lateral line scales 36-37; anus to anal distance 22.8–28.3% of pelvic to anal distance | qiaojiensis |
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(7) | (i) Caudal fin with W-shaped black mark | (8) |
(ii) Caudal fin without W-shaped black mark | (9) |
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(8) | (i) Caudal fin forked | nambulica |
(ii) Caudal fin slightly emarginated | (10) |
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(9) | (i) Rostral lobe present | poecilura |
(ii) Rostral lobe absent | (11) |
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(10) | (i) Snout without tubercles | abhoyai |
(ii) Snout with tubercles | (14) |
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(11) | (i) Snout without barbels | imberbis |
(ii) Snout with barbels | (12) |
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(12) | (i) Lateral line scales 30-31 | spilota |
(ii) Lateral line scales more than 37-38 | (13) |
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(13) | (i) Simple dorsal fin rays two; depth of body 17.0–17.6% SL | compressus |
(ii) Simple dorsal fin rays four; depth of body 20.4–24.6% SL | tengchongensis |
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(14) | (i) Rostral lobe absent, chest, and abdomen naked | Paralissorhynchus |
(ii) Rostral lobe present, chest, and abdomen scaled | namyaensis |
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