Morphology Data of Farlowella yarigui
Identification keys
Main Ref. Ballen, G.A. and J.I. Mojica, 2014
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance different morphology in juveniles and adults
Different colors
Remarks More prominent cephalic ridges in juveniles (vs. less defined and show gentle curvatures in adults); odontodes on plates on head, body and caudal peduncle form prominent keels no longer present in subadults and adults; odontodes on ventral surface of paired fins show the same median orientation as in adults; and spots on fins increase in number with size, from three to seven.

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral elongated
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales bony plates or armour

This species belongs to the Farlowella acus species group by the presence of long breeding odontodes on the snout in mature males, four rows of lateral body plates from the anteriormost portion of body to posterior margin of dorsal- and anal-fin base, and two complete rows of ventral plates and no single plate between pelvic-fin insertions. Diagnosed from other members of the F. acus species group by having the median anterior lateral row of plates diamond-shaped (vs. hexagonal in shape in F. acus, F. colombiensis, F. martini, F. venezuelensis and F. vittata). Further differs from F. martini by having dark interradial membranes on the caudal fin (vs. interradial membranes clear in F. martini). Distinguished from members of the Farlowella curtirostra species group by having restricted odontodes on sides of the snout but not extending onto the cheek region (vs. hypertrophied odontodes in breeding males extensive on sides of the snout and cheek); from members of the F. amazona species group by having notably concave lateral margins of the snout (vs. lateral margins of the snout straight to nearly straight) and eyes not elevated on the head (vs. eyes elevated on the head); from species of the Farlowella nattereri species group as well as from Farlowella gracilis by having four rows of lateral plates (vs. five rows in F. gracilis and F. nattereri species group); and from species of the F. knerii and F. mariaelenae species groups by having two abdominal plate rows (vs. three abdominal rows in the F. knerii and F. mariaelenae species groups) (Ref. 94974).

Ease of Identification

Meristic characteristics of Farlowella yarigui

Lateral Lines Interrupted: No
Scales on lateral line
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


Dorsal fin(s)

Fins number
Finlets No. Dorsal   
Spines total
Soft-rays total
Adipose fin

Caudal fin


Anal fin(s)

Fins number
Spines total
Soft-rays total

Paired fins

Pectoral Attributes  
Pelvics Attributes  
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Torres, Armi G.
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