Morphology Data of Cyphomyrus discorhynchus
Identification keys
Main Ref. Skelton, P.H., 2001
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks Females usually smaller than males, the latter develops a concavity to the margin of the anal fin, whereas that of the female is straight (Ref. 13337, 52193).

Descriptive characteristics of juvenile and adult

Striking features none
Body shape lateral fusiform / normal
Cross section oval
Dorsal head profile clearly convex
Type of eyes more or less normal
Type of mouth/snout more or less normal
Position of mouth terminal
Type of scales cycloid scales

Diagnosis: Dorsal fin up to 1.5 times in length of anal fin; origin of dorsal fin in advance of anal fin (Ref. 52193). Snout rounded, in front of mouth; eye well above mouth; chin with fleshy bulge (Ref. 4967). For distinguishing between specimens of Cyphomyrus discorhynchus en C. cubangoensis, the most useful anatomical characters are: longer dorsal fin length, longer anal fin length, higher number of dorsal fin rays and anal fin rays, and a higher caudal peduncle depth and caudal peduncle length ratio in C. discorhynchus than in C. cubangoensis (Ref. 119538).

Description: Body relatively deep, compressed (Ref. 52193). Head rounded with blunt snout, mouth with mental lobe, teeth biscuspid, 5-6 in each jaw (Ref. 52193). Teeth in upper jaw 4-7; teeth in lower jaw 5-8 (Ref. 122874). Dorsal fin longer than anal, dorsal fin origin before anal fin origin, caudal fin forked, with round lobes; dorsal-fin rays 28-37; anal-fin rays 23-27; pectoral-fin rays 10-11; pelvic-fin rays 6 (Ref. 52193, 122874). Scales on lateral line 57-73; circumpeduncular scales 12-13; scales between dorsal and anal fins 28-31; scales between dorsal fin and lateral line 15-17; scales between pelvic fin and lateral line 14-17 (Ref. 52193, 122874). Total number of vertebrae 39-41 (Ref. 122874).

Colouration: Greyish brown to dark brown, nearly black, lighter below, dark vertical bar sometimes evident between dorsal and anal fins (Ref. 52193).

Ease of Identification

Meristic characteristics of Cyphomyrus discorhynchus

Lateral Lines 1 Interrupted: No
Scales on lateral line 57 - 73
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 15 - 17
Scale rows below lateral line 14 - 17
Scales around caudal peduncle 12 - 13
Barbels 0
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 39 - 41


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Spines total 0 - 0
Soft-rays total 28 - 37
Adipose fin absent

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 23 - 27

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   10 - 11
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 )
Entered by Sa-a, Pascualita
Modified by Boden, Gert
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