Morphology Data of Jenynsia luxata
Identification keys
Abnormalities
Main Ref. Aguilera, G., J.M. Mirande, P.A. Calviño and L.P. Lobo, 2013
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance always different morphology between mature adults
Different colors
Remarks Males smaller than females and with intromittent organ formed by first eight anal-fin rays. Dorsal-fin insertion in females at halfway between pelvic and anal fins, in males closer to anal-fin origin. Pelvic fin reaching anus in females and reaching base of gonopodium in males. Absence of swelling between urogenital opening and anal-fin base of females.

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 terminal
Type of scales
Diagnosis

This species is distinguished from all congeners by the medial processes of left and

right pelvic bones relatively reduced, not overlapping each other at ventral midline. It can be further diagnosed by the following combination of characters: four to six regular rows of small

circular spots of dark brown chromatophores on body side, more apparent along caudal peduncle; absence of a swelling between the urogenital opening and the anterior base of the anal fin in females; 12-16 predorsal scales; absence of a large dorsal convex expansion at subdistal segments of right half of sixth anal-fin ray of adult males; eye diameter of females 26.1-33.1% HL; and absence of a distinct rounded spot on dorsal pectoral-fin base (Ref. 94152).

Ease of Identification

Meristic characteristics of Jenynsia luxata

Lateral Lines Interrupted: No
Scales on lateral line 30 - 33
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle 16 - 16
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 13 - 14
Vertebrae
preanal
total 28 - 30

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total
Soft-rays total 8 - 9
Adipose fin absent

Caudal fin

Attributes more or less truncate

Anal fin(s)

Fins number
Spines total
Soft-rays total 10 - 10

Paired fins

Pectoral Attributes  more or less normal
Spines     
Soft-rays   14 - 16
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Spines     
Soft-rays   6 - 6
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