Morphology Summary - Hypostomus johnii
Morphology Data of Hypostomus johnii
Identification keys
Abnormalities
Main Ref. Ramos, T.P.A., C.H. Zawadzki, R.T.C. Ramos and H.A. Britski, 2017
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)
Cross section oval
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

This species is distinguished by the following characters: high number of teeth on premaxillary (60-110) and dentary (65-115); teeth bicuspid, with asymmetric cusps; eyes small, orbital diameter 12.7-17.2% in HL and 27.8- 45.6% in interobital width; abdominal platelets more clustered on laterals of abdomen; one predorsal plate bordering supraoccipital; no hypertrophied odontodes on flanks. Colouration: dorsal and lateral body surfaces and fins light brown; head with very closely spaced small, dark spots; trunk with spots slightly larger than on head and forming somewhat longitudinal rows; interradial membranes of fins, except anal fin, with dark brown spots similar to those of the trunk forming 5-8 diagonal lines (from base to distal margin); anal fin light brown, spots, if present, faint and in low number; abdominal region light brown, with most individuals without spots on abdomen, some with dark brown spots irregularly scattered on entire abdomen; caudal peduncle without spots on its ventral surface (Ref. 133155).

Ease of Identification

Meristic characteristics of Hypostomus johnii

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

Fins

Dorsal fin(s)

Attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total 2 - 2
Soft-rays total 7 - 7
Adipose fin

Caudal fin  (shape guide)

Attributes

Anal fin(s)

Fins number
Spines total
Soft-rays total 4 - 4

Paired fins

Pectoral Attributes  
Spines     1
Soft-rays   6 - 6
Pelvics Attributes  
Position    
Spines     
Soft-rays   5 - 5
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