";} } ?> Morphology Summary - Marcusenius wamuinii
Morphology Data of Marcusenius wamuinii
Identification keys
Abnormalities
Main Ref. Decru, E., J.P. Sullivan and E. Vreven, 2019
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 fusiform / normal
Cross section
Dorsal head profile more or less straight
Type of eyes
Type of mouth/snout
Position of mouth terminal
Type of scales
Diagnosis

Diagnosis: Marcusenius wamuinii can be distinguished from all small-scaled Marcusenius species by having 8 circumpeduncular scales vs. 12-16 (Ref. 121662). Within the group of large-scaled Marcusenius species, it can be distinguished from M. kutuensis and M. ghesquierei by a lower number of dorsal-fin rays, 22-25 vs. 27--31 and 32-34, and by a dorsal-fin length that is smaller than the anal-fin length, 64.5-92.2% of anal-fin length vs. larger than the anal-fin length; it differs from M. ghesquierei, M. intermedius, M. kutuensis and M. moorii by a higher number of lateral line scales, 46-53 vs. 36-45, and from M. fuscus by a lower number of lateral line scales, 46-53 vs. 54-61; it differs from M. dundoensis by a dorsal fin height which is smaller than the dorsal fin length, 70.8-96.0% of dorsal-fin length vs. both fins about the same length, and by a lower number of lateral line scales, 46-53 vs. 51-61, and a lower number of scales between dorsal and anal fin, 19-22 vs. 21-25; it can be distinguished from M. schilthuisiae by a lower number of anal-fin rays, 27-31 vs. 32-35; it differs from M. kaninginii and M. sanagaensis by its lower caudal peduncle depth, 4.4-5.9% of standard length vs. respectively 6.8-7.7% and 6.1-6.3%, which is also an additional difference to distinguish it from M. intermedius and M. moorii; it differs from M. kaninginii by a higher number of scales between dorsal and anal fin, 19-22 vs. 16-19, and between dorsal fin and lateral line, 9-11 vs. 6-9; and from M. sanagaensis by its lower number of dorsal-fin rays, 22-25 vs. 24-28, a lower number of scales between dorsal and anal fin, 19-22 vs. 22-28, between dorsal fin and lateral line, 9-11 vs. 11-14, and between pelvic fin and lateral line, 9-12 vs. 12-14 (Ref. 121662).

Description: Body rather elongated, with highest body depth at anal-fin origin, and with straight to convex dorsal profile; caudal peduncle slender, its depth just behind anal fin about the same as its depth at the middle (Ref. 121662). Head profile convex; mouth terminal with small submental protuberance; snout rounded and blunt; single row of bicuspid teeth in upper and lower jaw, 4-5 in upper and 3-6 in lower jaw; eyes on anterior part of head; lower nostril more posteriorly on head than upper one (Ref. 121662). Preanal distance shorter than predorsal distance; dorsal-fin base shorter than anal-fin base; dorsal fin origin situated slightly behind anal-fin origin; dorsal- and anal-fin heights smaller than their lengths; dorsal-fin rays 22-25; anal-fin rays 27-31; pelvic-fin rays 6; pectoral-fin rays 9-10, pectoral fin about twice as long as pelvic fin; caudal fin deeply forked (Ref. 121662). Scales small just behind head, becoming gradually larger towards caudal peduncle; 46-53 lateral-line scales; 8-9 scales around caudal peduncle; 19-22 scales between dorsal and anal fin; 9-10 scales between dorsal fin and lateral line; 9-11 scales between pelvic fin and lateral line (Ref. 121662).

Colouration: In life: overall body colour silvery, more yellowish dorsally and more whitish ventrally; fins greyish and translucent; dorsal and caudal fin yellowish at their bases; caudal fin dark grey near its base; transverse black band on flanks visible in preserved specimens is absent or only vaguely visible in vivo (Ref. 121662). Preserved specimens: overall colour pattern brownish, dark brown on head, dorsal part of body and caudal peduncle, lighter ventrally; a transverse black band on flanks, starting close to dorsal-fin origin, extending ventrally through the entire depth of the flanks and covering two, sometimes three subsequent scales of the lateral line, and ending slightly behind the anal-fin origin; fins greyish, with the anterior portions of dorsal and anal fin darkened (Ref. 121662).

Ease of Identification

Meristic characteristics of Marcusenius wamuinii

Lateral Lines Interrupted: No
Scales on lateral line 46 - 53
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 9 - 11
Scale rows below lateral line
Scales around caudal peduncle 8 - 9
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 22 - 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 27 - 31

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   9 - 10
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Spines     0
Soft-rays   6 - 6
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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