| Main Ref. | Pereira, T.N.A. and R.M.C. Castro, 2014 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | different morphology in juveniles and adults |
| Different colors | |
| Remarks | Adults possess distinct secondary sexual characters on anal fin (vs. absent in juveniles). Males have anteriormost nine rays longer than additional rays forming a distinct anterior lobe, and elongation of 11th to 28th branched rays forming second bell-shaped lobe (vs. anteriormost 12 anal-fin rays are distinctly longer than other posteriormost rays, forming a distinct lobe in females). |
| Striking features | |
| Body shape lateral | |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | terminal |
| Type of scales | cycloid scales |
| Diagnosis |
Utiaritichthys esguiceroi is distinguished from its congeners by having 99-101 perforated scales on the lateral line (vs. 69-72 in U. sennaebragai, and 78-82 in U. longidorsalis), 17-19 prepelvic spines (vs. 9-10 in U. sennaebragai, and 28-31 in U. longidorsalis), 20-21 postpelvic spines (vs. 15-17 in U. sennaebragai, and 14 in U. longidorsalis), and 23-25 circumpeduncular scales (vs. 30-48 in U. sennaebragai, and 33-35 in U. longidorsalis). It can be further diagnosed from U. longidorsalis by having larger interdorsal width 11.8-15.6 % of SL (vs. 7.1-7.9% of SL), and larger adipose-fin base length 4.2-5.8 % of SL (vs. 3.7-3.8% of SL) (Ref. 96883). Description: dorsal-fin rays ii, 21; anal-fin rays iii-iv, 30 or 32; pectoral-fin rays i,16; pelvic-fin rays i, 7; scale rows between lateral line to pelvic-fin origin 27- 28 (Ref. 96883). |
| Ease of Identification |
| Lateral Lines | Interrupted: No |
| Scales on lateral line | |
| Pored lateral line scales | 99 - 101 |
| Scales in lateral series | |
| Scale rows above lateral line | 34 - 36 |
| Scale rows below lateral line | |
| Scales around caudal peduncle | 23 - 24 |
| Barbels | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | 18 - 18 |
| on upper limb | 12 - 12 |
| total | |
| Vertebrae | |
| preanal | 19 - 19 |
| total | 35 - 35 |
| Attributes | no striking attributes |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | 23 - 23 |
| Adipose fin | present |
| Attributes | forked |
| Fins number | |
| Spines total | |
| Soft-rays total |
| Pectoral | Attributes more or less normal |
| Spines | |
| Soft-rays 17 - 17 | |
| Pelvics | Attributes |
| Position abdominal beneath origin of D1 | |
| Spines | |
| Soft-rays 8 - 8 |