Morphology Data of Chromidotilapia regani
Identification keys
Abnormalities
Main Ref. Lamboj, A., 2002
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks Sexual dimorphism and dichromatism poorly developed; first ray of pelvic fin longest in both sexes, only slightly more pronounced in males than in females (Ref. 59155, 81260).

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral fusiform / normal
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

Diagnosis: high number of branchiospines on first outer branchial arch (23-31); first dorsal fin spine length 70-80% of the length of the 5th spine (Ref. 59155, 52307, 81260). When stressed with 2 continuous dark bands on body (Ref. 81260).

Description: compressed, deep-bodied (body depth 36.5-41.1%, mean 38.6% SL); snout prominent, pointed (snout length 33.7-47.4%, mean 42.3% HL); lachrymal deep (26.5-33.0%, mean 30.6% HL); predorsal profile steep, straight to dorsal fin origin (Ref. 81260). Infraorbital bones series complete with lachrymal and 4 other bones; lachrymal with 5 openings of laterosensory system; premaxilla with 2-3, dentary with 2 rows of unicuspid teeth; anteriorly in the lower jaws some teeth oriented posteriorly, not bucally; 2-4 rows of scales on cheek; lower pharyngeal bone triangular, with teeth shouldered unicuspid (lateral parts of the bone) or asymmetrical bicuspid (central field); well developed hanging pad on roof of pharynx (Ref. 59155). Caudal peduncle usually deeper than long or as deep as long (Ref. 81260). 13-16 (median 14) markedly tuberculate hypobranchial and ceratobranchial rakers, 8-15 (median 12) lanceolate epibranchial rakers (Ref. 59155, 81260). Adults of both sexes with some dorsal and anal fin rays elongated, caudal truncate to subtruncate; sexual dimorphism muted, males slightly larger than females with dorsal and anal rays a little more elongated (Ref. 81260). Chest scales smaller than flank scales, which are large (Ref. 59155, 81260). Scales cycloid; 3-4 horizontal scale rows on operculum; upper part of lateral line with 17-21 scales, lower with 7-12; end of upper lateral line sometimes overlapping lower lateral line by up to 1 or 2 scale rows; about 1/3 of caudal fin basally covered with scales, other fins unscaled (Ref. 59155). 2.5-3 scales between 8th pored scale of upper lateral line and dorsal fin base (Ref. 59155, 81260), 1-2 between last pored scale and dorsal fin base (Ref. 59155). 13-14 abdominal and 12 caudal vertebrae; tips of pelvic fin in most specimens not reaching anal fin; caudal fin truncate to subtruncate (Ref. 59155).

Coloration: body grey or light brown, paler ventrally (Ref. 52307, 59155, 81260). Body scales in males with narrow dark margins; cheek, opercle and chest pale grey (Ref. 59155, 81260). Soft dorsal, anal and caudal fin membranes in males with some small dark maculae; spinous dorsal in ripe females silvery blue (Ref. 52307, 59155, 81260). Dorsal fin and upper part of caudal with reddish margin in both sexes, usually more marked in males; sometimes 4-5 dark vertical bars on the body, occasionally 2 horizontal bands (in juveniles); juveniles with a strongly marked black spot covering the first 2-3 spines and dorsal fin membrane (Ref. 59155, 81260).

Ease of Identification

Meristic characteristics of Chromidotilapia regani

Lateral Lines Interrupted: No
Scales on lateral line 24 - 30
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle 15 - 16
Barbels 0
Gill clefts (sharks/rays only) absent
Gill rakers
on lower limb 13 - 16
on upper limb 8 - 15
total 23 - 31
Vertebrae
preanal
total

Fins

Dorsal fin(s)

Attributes
Fins number 1
Finlets No. Dorsal   0
Ventral  0
Spines total 14 - 17
Soft-rays total 10 - 12
Adipose fin absent

Caudal fin

Attributes more or less truncate; more or less normal

Anal fin(s)

Fins number 1
Spines total 3 - 3
Soft-rays total 6 - 8

Paired fins

Pectoral Attributes  
Spines     
Soft-rays   13 - 14
Pelvics Attributes  
Position    
Spines     1
Soft-rays   5 - 5
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