Morphology Data of Rasbora truncata
Identification keys
Abnormalities
Main Ref. Lumbantobing, D.N., 2010
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance always different morphology between mature adults
Different colors
Remarks Females are larger and more deep-bodied than males. Males possess row of antrorse tubercles on the anterodorsal surface of the pectoral-fin rays and by the pointed cephalic tubercles (vs. absent in females). Nuptial males with a hypertrophied region of the interradial membrane on the portion proximal to the tuberculate pectoral-fin rays, which is more opaque than its adjacent non-hypertrophied region.

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 cycloid scales
Diagnosis

Distinguished from all members of Rasbora trifasciata-group by a weakly developed post-opercular streak, which extends ventrally to the horizontal through the ventral margin of pupil (vs. distinct streak, which extends ventrally to reach the axillary lobe of pectoral fin). Can be further diagnosed from other members in northwestern Sumatra by the following combination of characters: male cephalic tubercles conical, distinctly pointed, with a shallow, wide depression basally; presence of cranial superficial neuromasts (each basal plate is lower than the skin surface and surrounded by peripheral ridge and groove, respectively); the first infraorbital (lachrymal) with a relatively straight dorsal margin, but without a posterodorsal process; the lachrymal region peripherally pigmented with an unpigmented central area; absence of dorsomedial branch of supraorbital canal toward posterior margin of frontal; an axial streak extending forward and terminating at the area between vertical through the dorsal-fin origin and the pelvic-fin insertion; the cephalic tubercles present only in males; a transverse scale count anterior to the dorsal-fin origin and pelvic-fin insertion of K4/1/2K; 12 circumpeduncular scales; an immaculate opercular flap; a basal reticulation pattern comprised of a network of well-developed parenthesis-shaped bars on the midlateral surface of the body; a maximum vertical coverage of the basal reticulation two and a half longitudinal scale rows; the lateral line absent from one to six posterior scales (only 20-26 scales perforated); lateral line series unpigmented on the posterior portion; and the pelvic-fin rays i,7 (Ref. 94947).

Description: Dorsal-fin rays ii, 7½; anal-fin rays ii, 5½; pectoral-fin rays i, 12-13; pelvic-fin rays i, 7; black basicaudal spot absent; gill rakers on 1st gill arch 12-13 (Ref. 94947).

Ease of Identification

Meristic characteristics of Rasbora truncata

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales 20 - 26
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle 12 - 12
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 12 - 13
Vertebrae
preanal
total 31 - 32

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total
Soft-rays total 9 - 9
Adipose fin absent

Caudal fin

Attributes forked; asymmetric

Anal fin(s)

Fins number
Spines total
Soft-rays total 7 - 7

Paired fins

Pectoral Attributes  more or less normal
Spines     
Soft-rays   13 - 14
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Spines     
Soft-rays   8 - 8
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Torres, Armi G.
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