Morphology Data of Tylochromis elongatus
Identification keys
Abnormalities
Main Ref. Stiassny, M.L.J., 1989
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
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

Diagnosis: 15-16 gill-rakers along lower limb of first arch; 36-38 lateral line scales (count started on upper line and continued on lower line, including the intermediate scales); an extremely robust lower pharyngeal jaw with mill-like molariform teeth occupying 2/3 of dentigerous surface (Ref. 52346).

Description: relatively slender; front of head slightly convex over eyes (Ref. 52307). Predorsal profile frequently interrupted by a slight thickening in interorbital region; deepest body depth along back lies well behind dorsal fin origin, often as far back as 7th-8th dorsal spine; lower jaw slightly inclined forming an angle of about 10 with horizontal when mouth is closed; lower pharyngeal jaw a robust and compact element with a heavily molariform dentition; lips well-developed but not notably thick or fleshy; gill rakers on lower limb of first branch short, stout and slightly crenate, epibranchial rakers on upper limb of first arch relative elongate; upper lateral line ends a little in front of end of soft dorsal, usually below 4th-5th ray from free end of fin; terminal canal bearing scales descends a row and continues for 1-2 scales; dorsal and ventral lateral line branches on caudal fin terminate somewhat short of fin periphery while median branch is shorter, usually extending only one half of fin length; dorsal fin spines increase gradually to 5th-6th and are then more or less equal in length; anal fin rounded; pectoral fins relatively short but extending in large individuals to level of spinous anal fin; first branched pelvic ray filamentous and slightly produced; caudal fin emarginate and finely scaled almost to periphery (Ref. 52346).

Coloration: Preserved specimens: uniform light or dark brown, with a well-defined nape band and traces of 5-6 elongate vertical bands that reach down to well below midline; smoky brown dorsal fin spotted by numerous rows of small whitish maculae; no traces of anal fin maculae on any of the larger specimens (Ref. 52346).

Ease of Identification

Meristic characteristics of Tylochromis elongatus

Lateral Lines 2 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 0
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 15 - 16
on upper limb 7 - 8
total 22 - 24
Vertebrae
preanal
total 28

Fins

Dorsal fin(s)

Attributes
Fins number 1
Finlets No. Dorsal   0
Ventral  0
Spines total 14
Soft-rays total 15
Adipose fin absent

Caudal fin

Attributes

Anal fin(s)

Fins number 1
Spines total
Soft-rays total 7

Paired fins

Pectoral Attributes  
Spines     
Soft-rays   
Pelvics Attributes  
Position    
Spines     
Soft-rays   
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Musschoot, Tobias
Modified by Musschoot, Tobias
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