Glossary

caudal peduncle

The typically narrow section of the body located between the posterior of the dorsal and anal fins and caudal fin origin. Its depth is measured vertically at the narrowest point.

Used in 394 species profiles

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Related terms

adipose crest
Fatty ridge of flesh extending along the dorsal or ventral surface of the caudal peduncle in certain fishes, e.g., some Schistura spp.
anal-fin
A median, unpaired, ventral fin located between the anus and caudal fin, usually in the posterior portion of the body. Used to maintain equilibrium and stability.
caudal keel
A fleshy, raised ridge extending along the caudal peduncle, most commonly the dorsal surface.
caudal peduncle scale count
Count often used in species descriptions and comparisons, made by counting the number of scales present around the narrowest part of the caudal peduncle.
caudal-fin
Also referred to as the tail fin, it's main purpose is thrust and propulsion.
circumpeduncular scale count
Count of the number of scales encircling the narrowest part of the caudal peduncle.
circumpeduncular scales
Scales encircling the caudal peduncle.
crest
Bony or fleshy ridge on the head or certain parts of the body, e.g., the caudal peduncle.
dorsal
Of, toward, on, in, or near the back or upper surface of an organism or part.
keel
Ridgelike structure located on the ventral surface, caudal peduncle or caudal fin base in certain fishes.
posterior
Located near or towards the rear end; further back in position.
ventral keel
Fleshy, longitudinal ridge running along the abdomen and caudal peduncle in some fishes.

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