Morphology Summary - Hapalogenys olivaceus
Morphology Data of Hapalogenys olivaceus
Identification keys
Abnormalities
Main Ref. Bagorodsky, S.V., P. Matiku and S. Reddy, 2026
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) short and / or deep
Cross section compressed
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: dorsal-fin rays XI,14; pored lateral-lines scales 44-45; a series of 9-10 pores along the ventral edge of the suborbital; maxilla scaly; suborbital deeply notched above the posterior end of the maxilla; second dorsal-fin ray short, 6.5-6.8 in SL; first pelvic-fin ray filamentous; body mainly uniform olive-brown with a pale area posterior to pectoral fins; and membranes of the posterior part (between spines IX-XI) of the spinous dorsal fin black (Ref. 138836).

Ease of Identification

Meristic characteristics of Hapalogenys olivaceus

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales 44 - 45
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 10 - 10
total 24 - 24

Fins

Dorsal fin(s)

Attributes
Fins number
Finlets No. Dorsal   
Ventral  
Spines total 11 - 11
Soft-rays total 14 - 14
Adipose fin

Caudal fin  (shape guide)

Attributes

Anal fin(s)

Fins number
Spines total 3 - 3
Soft-rays total 9 - 9

Paired fins

Pectoral Attributes  
Spines     
Soft-rays   18 - 18
Pelvics Attributes  
Position    
Spines     
Soft-rays   
(e.g. 9948)
(e.g. oophagy)
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