Morphology Data of Gambusia quadruncus
Identification keys
Main Ref. Langerhans, R.B., M.E. Gifford, O. Domínguez-Domínguez, D. García-Bedoya and T.J. DeWitt, 2012
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors

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

Belongs to the affinis species group and differs from all other members of this group by the following combination of characters: terminal hook at the distal tip of the gonopodium formed by rays 4a, 4p or both; elbow on gonopodial ray 4a positioned more distal relative to serrae (typically positioned one segment or more distal to serrae) and anal spots in females that are permanent, more prominent and positioned more posteriorly than other members (typically spanning the second to fifth or sixth rays) (Ref. 91760).

Ease of Identification

Meristic characteristics of Gambusia quadruncus

Lateral Lines Interrupted: No
Scales on lateral line 29 - 32
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 30 - 33


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Spines total
Soft-rays total 7 - 9
Adipose fin absent

Caudal fin

Attributes more or less truncate

Anal fin(s)

Fins number
Spines total
Soft-rays total 9 - 11

Paired fins

Pectoral Attributes  more or less normal
Soft-rays   12 - 14
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Soft-rays   6 - 6
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Torres, Armi G.
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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