| Main Ref. | Keith, P., C. Lord and H.K. Larson, 2017 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks | Male has longer jaws than female and different color pattern on ventral surface ofhead. Male has urogenital papilla slightly triangular (vs. broadly rounded in females). |
| Striking features | |
| Body shape lateral | elongated |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | |
| Type of scales | |
| Diagnosis |
Schismatogobius alleni can be distinguished by having the following characters: pectoral fin with 17 rays; pectoral fins banded; membrane in flrst dorsal fin posterior to spine 6 not connected to base of spine of second dorsal fin; transverse row of papillae on midcheek between row D and d; male with ventral surface of head plain brownish with blackish pigment on frenum and pelvic disk; female with ventral surface of head blackish, black pigment surrounding whitish mentum and middle of lower lip; and frenum whitish (Ref.116768). |
| Ease of Identification |
| Lateral Lines | Interrupted: No |
| Scales on lateral line | |
| Pored lateral line scales | |
| Scales in lateral series | |
| Scale rows above lateral line | |
| Scale rows below lateral line | |
| Scales around caudal peduncle | |
| Barbels | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | |
| total |
| Attributes | |
| Fins number | 2 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 7 - 7 |
| Soft-rays total | 9 - 9 |
| Adipose fin | absent |
| Attributes |
| Fins number | |
| Spines total | 1 - 1 |
| Soft-rays total | 9 - 9 |
| Pectoral | Attributes |
| Spines | |
| Soft-rays 17 - 17 | |
| Pelvics | Attributes joint, cup-like |
| Position | |
| Spines 1 | |
| Soft-rays 5 - 5 |