Morphology Summary - Characidium jivaro
Morphology Data of Characidium jivaro
Identification keys
Abnormalities
Main Ref. Zanata, A.M., R. Britzke, V. Meza-Vargas, M.H. Hidalgo, D. Faustino-Fuster and L. Oliveira-Silva, 2025
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral  (shape guide) elongated
Cross section oval
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

This species is distinguished from its congeners by the following set of characters: black longitudinal band that extends along the total length of the paired fins, from the base to tip of the third unbranched and first branched rays on pectorals and first two branched rays on the pelvic fins; bony processes along length of the pectoral-fin rays, dorsally positioned, on mature and immature females and males; teeth on the premaxilla and dentary strongly tricuspid, with three well developed and similar sized cusps; completely perforated lateral-line scales; lack of a conspicuous dark narrow stripe extending from rear of opercle to end of caudal peduncle; lack of 13 or more thin conspicuous black bars from dorsum to ventral portion of body; lack of dark blotches on opercle and preopercle; remnants of bars in maturing and matures specimens slightly concave anteriorly; four series of scales above the lateral line and three or four from the lateral line to the pelvic-fin insertion; and lack of dark spots on the caudal fin (Ref. 138327).

Ease of Identification

Meristic characteristics of Characidium jivaro

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales 34 - 36
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 15 - 16
total 33 - 35

Fins

Dorsal fin(s)

Attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total
Soft-rays total 9 - 9
Adipose fin present

Caudal fin  (shape guide)

Attributes

Anal fin(s)

Fins number 1
Spines total
Soft-rays total 6 - 6

Paired fins

Pectoral Attributes  
Spines     
Soft-rays   7 - 8
Pelvics Attributes  
Position    
Spines     
Soft-rays   6 - 7
(e.g. 9948)
(e.g. oophagy)
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