";} } ?> Morphology Summary - Marcusenius multisquamatus
Morphology Data of Marcusenius multisquamatus
Identification keys
Abnormalities
Main Ref. Kramer, B. and M. Wink, 2013
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance always different morphology between mature adults
Different colors
Remarks Males approaching sexual maturity develop a kink in the base of the anal fin that is absent in juveniles and females where the anal fin base is straight (Ref. 94473).

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 terminal
Type of scales cycloid scales
Diagnosis

Diagnosis: Body moderately long, prominent mobile and forward-extending mental lobe on lower jaw, median fins set well back with dorsal fin shorter than and originating behind anal fin, depth of caudal peduncle 34–43% of its length, 23–25 dorsal fin rays, 28–31 anal fin rays, 56–64 scales in lateral series, 12–16 scales around caudal peduncle, head length 19–21% of standard length, body depth 27–32% of standard length, dorsal fin length 18.1–22.3% of standard length, length of snout 45–50% of head length, anal fin length 22.7–25.3% of standard length, and length of caudal peduncle 16.3–19.9% of standard length (Ref. 94473).

Description: Head with terminal mouth well in front of eye, mental lobe on lower jaw protruding beyond upper jaw; head and body dorsolaterally compressed (Ref. 94473). Dorsal fin situated about two-thirds of standard length from snout, obliquely oriented, anteriorly higher and posteriorly lower, distal margin sometimes only slightly crescent-shaped with anterior two or three rays longer than posterior rays, number of rays 23-25; anal fin opposite dorsal fin with distinctly more anterior origin, obliquely oriented, anteriorly lower and posteriorly higher, anterior rays longer than posterior ones, especially in males where they also appear stronger and often darkened, distal margin crescent-shaped, number of rays 28-31 (Ref. 94473). Scales cycloid with reticulate striae, scales extending anteriorly to operculum and pectoral fins; scales on caudal peduncle circumference, 12-16 (Ref. 94473). Caudal peduncle relatively deep, subcylindrical entire length, usually 16.3-19.9% in standard length (Ref. 94473). Electric organ discharge biphasic with weak pre-potential (Ref. 94473).

Colouration: Colour in life: brownish grey with many distinct dark-brown blotches, except on head and belly, purple hue depending on the angle of light incidence, paired fins light and transparent (Ref. 94473). Colour in preservation: medium brown, with darker, irregular blotches (Ref. 94473).

Ease of Identification

Meristic characteristics of Marcusenius multisquamatus

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series 56 - 64
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle 12 - 16
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total
Vertebrae
preanal
total

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total 0 - 0
Soft-rays total 23 - 25
Adipose fin absent

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 28 - 31

Paired fins

Pectoral Attributes  more or less normal
Spines     
Soft-rays   
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Spines     
Soft-rays   
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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