Morphology Data of Zaireichthys lacustris
Identification keys
Abnormalities
Main Ref. Eccles, D.H., D. Tweddle and P.H. Skelton, 2011
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
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth sub-terminal/inferior
Type of scales
Diagnosis

Diagnosis: This species is distinguished from all other members of the genus by the short snout, which is less than one third of the head length, and by its unique habitat, occupying empty snail shells in the lake (Ref. 86935).

Description: Lateral line short, reaching about to base of pelvic fins; skin minutely granular (Ref. 86935). Head broader in relation to standard length than in all other species of Zaireichthys, depressed, with narrow supra-occipital process almost as long as interorbital width and nearly reaching basal shield of first dorsal spine; snout broadly rounded, scarcely projecting beyond upper lip; eyes relatively large; mouth small, less than half head width; barbels relatively short, the maxillary reaching to about base of pectoral fin and bearing a posterior fringe for the basal third; humeral process pointed, proportionally longer than in all other species of Zaireichthys except Z. kafuensis (Ref. 86935). Dorsal fin II,4-5, base of first spine about level with end of humeral process and base of fin short; adipose fin moderately long, with posterior end almost vertical, not reaching procurrent caudal rays; caudal fin truncate or slightly emarginate, with 4-6 branched rays in the upper lobe and 5-7 in the lower, usually with a total of 11 branched rays, preceded by 14-16 procurrent rays; anal fin with 9-11, usually 10, soft rays, the first 3-5 simple; pectoral fins rounded posteriorly with 6-7 branched rays, the spine bearing 4-7 stout barbs above the fin membrane; pelvic fins short, usually ending level with origin of adipose (Ref. 86935). Premaxillary tooth patch shaped like mirror-image commas; teeth caniniform in 5-6 rows, the outer with about 6 and the inner with about 14 teeth on each side; lower jaw with 3-4 rows of 14-16 teeth on each side, the outer teeth largest (Ref. 86935).

Colouration: Almost transparent in life, with three horizontal darker blotches and with head mottled (Ref. 86935). Preserved specimens pale, with light brown marbling on nape and shoulders, a series of about ten faint brown blotches dorsally, about ten mid-lateral blotches, the posterior of which are more elongated, and darker patches above bases of pelvic fins, above anal fin and at base of caudal fin (Ref. 86935).

Ease of Identification

Meristic characteristics of Zaireichthys lacustris

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
Vertebrae
preanal
total

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total 2 - 2
Soft-rays total 4 - 5
Adipose fin present

Caudal fin

Attributes more or less truncate

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 9 - 11

Paired fins

Pectoral Attributes  more or less normal
Spines     1
Soft-rays   6 - 7
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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