Morphology Data of Jenynsia tucumana
Identification keys
Abnormalities
Main Ref. Aguilera, G. and J.M. Mirande, 2005
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors always different colors between mature adults
Remarks Males are much smaller than females, with tubular intromittent organ formed by 8 first anal-fin rays; length of gonopodium 1.3-1.5 in caudal peduncle; posterior two anal-fin rays not forming part of tubular intromittent organ and extending approximately two-thirds of gonopodium length. Females without swelling between urogenital opening and anterior base of anal fin.

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 differs from all its congeners by having a row of dark markings ranging from dots to small vertical stripes, on the lateral surface, from the tip of the adpressed pectoral fin to the margin of hypural. It can be further diagnosed by the combination of the following characters: two, occasionally three, rows of dorsoventrally elongate markings on the lateral surface of body; a mandibular canal pore W, a wide prootic bridge, and a symmetric fifth anal-fin ray of the tubular gonopodium; 15-16 predorsal scales; absence of a swelling between the urogenital opening and the anterior base of the anal fin in females; absence of a rounded spot on dorsal pectoral-fin base; absence of a large dorsal convex expansion at subdistal segments of right half of sixth anal-fin ray of adult males; and absence of a long posterodorsal process of the lachrymal and a shorter fourth anal-fin ray in the gonopodium (Ref. 56908).

Ease of Identification

Meristic characteristics of Jenynsia tucumana

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series 31 - 34
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 10 - 12
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 7 - 8
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   15 - 17
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Spines     
Soft-rays   6 - 6
Back to Search
Comments & Corrections
cfm script by eagbayani, 17.10.00, php script by rolavides, 13/03/08 ,  last modified by sortiz, 06.27.17