Morphology Data of Diancistrus mcgroutheri
Identification keys
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

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

The species is distinguished by having the following characters: Vertebrae 11+30=41, dorsal fin rays 73-76, anal fin rays 56-61; small eyes (1.5-2.1% SL); outer pseudoclasper with small ear-lobe extension opening inwards; inner pseudoclasper free from outer pseudoclasper, with supporter, forming a sharp, forward-inclined thorn; narrow scale patch on cheek, absence of scales on operculum; head profile slender; otolith length to height ratio 2.0-2.2 (Ref. 57884).

Description: Characterized by depth of body at anal fin origin 17.3-18.7 (mean=18.0) % SL (Ref. 90102).

Ease of Identification

Meristic characteristics of Diancistrus mcgroutheri

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
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 14 - 18
preanal 11 - 11
total 41 - 41


Dorsal fin(s)

Fins number
Finlets No. Dorsal   
Spines total
Soft-rays total 73 - 76
Adipose fin

Caudal fin


Anal fin(s)

Fins number
Spines total
Soft-rays total 56 - 61

Paired fins

Pectoral Attributes  
Soft-rays   20 - 22
Pelvics Attributes  
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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