| Main Ref. | Kawase, S. and K. Hosoya, 2015 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | different morphology during breeding season only |
| Different colors | |
| Remarks | During breeding season males develop secondary sexual characteristics characterized by body larger than that of female, nuptial tubercles sparsely developed on snout and lower jaw, dark grey nuptial color on all body surfaces and anterior margin of anal fin straight (vs. slightly concave in females). |
| Striking features | |
| Body shape lateral | elongated |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | superior |
| Type of scales | |
| Diagnosis |
Pseudorasbora pugnax can be diagnosed from other Japanese congeners by having a faint dark stripe on the flank which disappears in females and poorly-developed nuptial tubercles in adult males. It differs from P. parva in having longer head (27.5-31.9 % SL vs. 23.5-27.3), lateral line incomplete (vs. complete), infraorbital, supraorbital and supratemporal canals of the cephalic lateralis system incomplete (vs. complete). It can be further distinguished from P. pumila in having 33-34 vertebrae (vs. 34-35), infraorbital canal of cephalic lateralis system developed (vs. undeveloped) with a rostral branch present (vs. absent), nasal canal present (vs. absent) and mandibular canal complete (vs. incomplete) (Ref. 103407). Description: 3 simple and 7 branched rays on dorsal fin; 3 simple and 6 branched rays on anal fin; 1 simple and 12-14 branched rays on pectoral fin; 2 simple and 7 branched rays on pelvic fin; 0-6 pored lateral-line scales followed by 27-33 unpored scales (Ref. 103407). |
| Ease of Identification |
| Lateral Lines | Interrupted: No |
| Scales on lateral line | 31 - 33 |
| Pored lateral line scales | 0 - 6 |
| Scales in lateral series | |
| Scale rows above lateral line | 5 - 7 |
| Scale rows below lateral line | 4 - 5 |
| Scales around caudal peduncle | |
| Barbels | 0 |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | 18 - 19 |
| total | 33 - 34 |
| Attributes | no striking attributes |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | 10 - 10 |
| Adipose fin | absent |
| Attributes | forked |
| Fins number | |
| Spines total | |
| Soft-rays total | 9 - 9 |
| Pectoral | Attributes more or less normal |
| Spines | |
| Soft-rays 13 - 15 | |
| Pelvics | Attributes more or less normal |
| Position abdominal before origin of D1 | |
| Spines | |
| Soft-rays 9 - 9 |