Morphology Data of Ladigesia roloffi
Identification keys
Main Ref. Paugy, D., 2003
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs no special organs
Different appearance always different morphology between mature adults
Different colors
Remarks Sexual dimorphism in anal fin shape (Ref. 2880, 81279).

Descriptive characteristics of juvenile and adult

Striking features none
Body shape lateral fusiform / normal
Cross section
Dorsal head profile more or less straight
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: small, elongate fish with incomplete lateral line; scaleless dorsal part (of about at least 3 scale rows wide on both sides) from behind the opercle to the adipose fin; parietal fontanella open (Ref. 2880, 81279).

Description: dorsal-fin origin behind level of pelvic-fin insertions which are positioned at about mid-length of body; anal fin with 3 unbranched and 13-14 branched rays; anal fin short, sexually dimorphic like in many other Alestidae; premaxilla with 4 outer and 8 inner teeth; mandible with single row of 8 outer teeth; 34 or 35 scales in a longitudinal, and 7 or 9 scales in a transverse series (Ref. 2880, 81279).

Coloration: live specimens have odd, some peer fins (Ref. 81279). Eyes bright red; unbranched rays of dorsal and caudal fin, and the tips of branched rays are black; no humeral spot; after preservation lateral band becomes black and appears from the opercle up to the median rays of caudal fin (Ref. 2880, 81279).

Ease of Identification

Meristic characteristics of Ladigesia roloffi

Lateral Lines 1 Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series 34 - 35
Scale rows above lateral line 2 - 3
Scale rows below lateral line 7 - 9
Scales around caudal peduncle
Barbels 0
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 11 - 12
on upper limb


Dorsal fin(s)

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

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 16 - 17

Paired fins

Pectoral Attributes  more or less normal
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Palomares, Maria Lourdes D.
Modified by Geelhand, Dimitri
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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