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Morphology Data of Channallabes apus
Identification keys
Main Ref. Teugels, G.G., D. Adriaens, S. Devaere and T. Musschoot, 2007
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 circular
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales

Diagnosis: small supraorbital process on infraorbital IV, not reaching the rostral border of the eye; fenestra between scapulo-coracoid and cleithrum absent; interdigitation between entopterygoid and quadrate (Ref. 81644).

Description: body extremely elongate, abdominal depth 2.5-9.6% SL (mean 5.0); long dorsal and anal fins, continuous with caudal fin; distance between supraoccipital process and dorsal fin 4.6-20% SL (mean 9.2); pectoral fins present or absent, when present, length between 2.4-39.9% of skull length; pelvic fins absent in most cases, however, several specimens have both or a single pelvic fin, with length 15.8-30.6% skull length (mean 24.5); skull short, 4.8-17.8% SL (mean 9.7); skull roof (exposed bony part in between bulging jaw muscles) narrow, 10.7-35.3% (mean 21.6) skull length; jaw muscles hypertrophied but may or may not bulge (generally bulging in larger specimens); eyes bordered by small infraorbital bones, of which postorbital one has a plate-like outgrowth; internal mandibular barbel always shorter than skull, other barbels longer; maxillary barbel longest (55-151% HL, m = 93); eyes small, without free orbital rim (Ref. 81644).

Coloration: body uniformly dark to pale brown, paler ventrally or fades from dark to pale (e.g. specimens from Congo basin); unpaired fins coloured as body, paired fins usually paler (Ref. 81644).

Ease of Identification

Meristic characteristics of Channallabes apus

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 8
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 76 - 117


Dorsal fin(s)

Attributes continuous with caudal fin
Fins number 1
Finlets No. Dorsal   0
Ventral  0
Spines total 0
Soft-rays total 105
Adipose fin absent

Caudal fin

Attributes pointed; confluent

Anal fin(s)

Fins number 1
Spines total 0
Soft-rays total 118

Paired fins

Pectoral Attributes  other (see Diagnosis)
Pelvics Attributes  other (see Diagnosis)
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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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