Morphology Data of Diancistrus niger
Identification keys
Abnormalities
Main Ref. Schwarzhans, W., P.R. Møller and J.G. Nielsen, 2005
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 elongated
Cross section compressed
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

This species is characterized by the following: vertebrae 11+30-32=41-43, dorsal fin rays 69-76, anal fin rays 52-59; large eyes (3.0-3.6% SL); outer pseudoclasper large, broad, ear-lobe shaped, opening ventrally; inner pseudoclasper a fleshy appendix at anterior-inner rim of outer pseudoclasper, without supporter; no scales on operculum; head is compressed, blunt; otoliths elongate, ratio otolith length: height 2.3, anterior and posterior tips of otolith almost equally pointed; color dark grey to black when preserved (Ref. 57884).

Description: Characterized by depth of body at anal fin origin 20.0-22.8 (mean=21.0) % SL (Ref. 90102).

Ease of Identification

Meristic characteristics of Diancistrus niger

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 13 - 17
Vertebrae
preanal 11 - 11
total 41 - 43

Fins

Dorsal fin(s)

Attributes
Fins number
Finlets No. Dorsal   
Ventral  
Spines total
Soft-rays total 69 - 76
Adipose fin

Caudal fin

Attributes

Anal fin(s)

Fins number
Spines total
Soft-rays total 52 - 59

Paired fins

Pectoral Attributes  
Spines     
Soft-rays   17 - 18
Pelvics Attributes  
Position    
Spines     
Soft-rays   
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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