Morphology Data of Marcusenius lucombesi
Identification keys
Abnormalities
Main Ref. Maake, P.A., O. Gon and E.R. Swartz, 2014
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance always different morphology between mature adults
Different colors
Remarks Males at sexual maturity have kink in the base of the anal fin distinctly curving inward (Ref. 95448).

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: Marcusenius lucombesi can be distinguished from its congeners by the following characters: distance dorsal fin origin to end of caudal peduncle 40.0-43.2% of standard length; distance anal fin origin to end of caudal peduncle 43.6-45.9% of standard length; pre-anal length 56.6-59.2% of standard length; pre-dorsal length 59.5-63.3% of standard length; low caudal peduncle depth 25.0-30.8% into its length; circumpeduncular scales 14-16; anal fin rays 28-29; dorsal fin rays 22-24; total vertebrae 44; lateral line scales 55-56; anterior gill rakers (4-5)+(4-5); total anterior gill rakers 8-10; posterior gill rakers (6)+(7); total posterior gill rakers 13; jaws with 5-5 conical teeth (Ref. 95448).

Description: Head with terminal mouth well in front of eye, mental lobe on lower jaw protruding in front of upper jaw; head and body compressed; snout very pointy; pre-anal distance shorter than pre-dorsal distance; distance from origin of anal fin to origin of dorsal fin equal to the middle body depth; pre-pelvic distance twice as long as the distance between pelvic and anal fins (Ref. 95448). Dorsal and anal fins set well back on the body, situated about two thirds of standard length from the snout and opposite each other; dorsal fin shorter, originating on vertical at 3rd anal fin ray and ending before anal fin base; distal margins of dorsal and anal fins obliquely orientated, with rays becoming gradually shorter posteriorly; dorsal fin rays 22-24, its anterior rays highest, with distal margins rounded and slightly concave; anal fin rays 28-29; anterior anal fin rays of sexually mature males longer, appear stronger, are crescentic and rounded, but are anteriorly sharp and pointy in females and juveniles; pectoral fins rays 10; pectoral fins distinctly very long, reaching origin of pelvic fin (Ref. 95448). Middle body depth 25.0-28.4% of standard length; caudal peduncle thinner, subcylindrical across its entire length 19.7-21.7% of standard length; caudal peduncle depth 25.0-30.8% into its length (Ref. 95448). Lateral line scales 55-56; lateral line scales cycloid with reticulate striae; 14-16 scales along the caudal peduncle circumference (Ref. 95448). Jaws with 5-5 conical teeth; 44 vertebrae; gill rakers on anterior side covered with many minute spines, total anterior gill rakers 8-10 on the first gill arch; total posterior gill rakers 13 on the posterior side of first gill arch; gill rakers on posterior side shorter, thicker and covered by minute spines (Ref. 95448).

Colouration: light brown when preserved; homogeneous colouration without any blotches, increasingly lighter on belly (Ref. 95448).

Ease of Identification

Meristic characteristics of Marcusenius lucombesi

Lateral Lines Interrupted: No
Scales on lateral line 55 - 56
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle 14 - 16
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 4 - 5
on upper limb 4 - 5
total 8 - 10
Vertebrae
preanal
total 44 - 44

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total 0 - 0
Soft-rays total 22 - 24
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 - 29

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   10 - 10
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Spines     
Soft-rays   
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Boden, Gert
Modified by Bailly, Nicolas
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cfm script by eagbayani, 17.10.00, php script by rolavides, 13/03/08 ,  last modified by sortiz, 06.27.17