Morphology Data of Neolebias unifasciatus
Identification keys
Abnormalities
Main Ref. Vari, R.P., 2007
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs no special organs
Different appearance always different morphology between mature adults
Different colors
Remarks Body more robust in some apparently female specimens (Ref. 81638).

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

Diagnosis: body depth 2.8-3.8x and head length 1.8-2.2x in SL (Ref. 2936, 86396). 33-35 lateral line scales (Ref. 2936, 81638, 86396). Laterosensory canal on lateral surface of head limited to arch of pores around ventral and posterior margins of orbit and associated with preopercle; 6th infraorbital (dermosphenotic) present, with laterosensory canal segment; infraorbital present at posterior margin of orbit; maxilla with 4 or fewer teeth; maxilla falling short of vertical through anterior margin of orbit; scaly process present at base of pelvic fin; dark pigmentation along lateral surface of body two scales wide or less; dark band on lateral surface of body passing through middle of caudal peduncle; base of caudal fin unpigmented or with rounded spot that falls distinctly short of dorsal and ventral margins of caudal peduncle (Ref. 81638). 12-15 total dorsal fin rays and 10-11 total anal fin rays (Ref. 2936, 81638, 86396).

Description: snout rounded, smaller than eye (Ref. 2936, 86396). Body moderately elongate, more robust in some apparently female specimens; body depth 0.27-0.33x SL; head profile moderately acute anteriorly but with rounded snout (Ref. 81638). Caudal peduncle 1.2-1.5x longer than deep (Ref. 2936, 86936). Premaxilla and dentary with 2 rows of teeth; teeth of outer row bicuspid, teeth of inner row conical (Ref. 2936, 81386, 86396). Premaxilla with 8 teeth in outer row (Ref. 81638). Maxilla not reaching to below anterior eye margin (Ref. 2936, 86396) and with 2-3 teeth along anterodorsal margin (Ref. 2936, 81638, 86396). Laterosensory canal system of head not elaborated; body scales ctenoid and of moderate size; 10 scales between dorsal fin origin and mid-ventral line (excluding median scales); D: III-IV,9-11; A: III,7-8 (Ref. 81638). Lateral line incomplete with pores on anterior 5-7 (Ref. 81638) or 6-9 (Ref. 2936, 86396) scales.

Coloration: preserved specimens olivaceous-brown, darker dorsally on both head and body (Ref. 2936, 81638, 86396). Head with distinct mid-lateral band beginning on snout and extending to rear of opercle; band continuous posteriorly with band on body (Ref. 81638). Body with dark mid-lateral band extending from immediately posterior of opercle to posterior limit of caudal peduncle, sometimes terminating posteriorly in broader dark spot (Ref. 2936, 81638, 86396). Its width comprising lower halves of lateral-line scales and upper halves of next-lower scale row (Ref. 2936, 86396). Caudal fin with dark basal spot on middle caudal rays in region proximate to rear of mid-lateral band on body (Ref. 81638).

Ease of Identification

Meristic characteristics of Neolebias unifasciatus

Lateral Lines 1 Interrupted: No
Scales on lateral line 33 - 35
Pored lateral line scales 5 - 9
Scales in lateral series
Scale rows above lateral line 10 - 10
Scale rows below lateral line
Scales around caudal peduncle
Barbels 0
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total
Vertebrae
preanal
total

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total 0 - 0
Soft-rays total 12 - 15
Adipose fin absent

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 10 - 11

Paired fins

Pectoral Attributes  more or less normal
Spines     
Soft-rays   
Pelvics Attributes  more or less normal
Position    abdominal  beneath origin of D1
Spines     
Soft-rays   
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