Glossary

margin

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Edge or rim.

Used in 265 species profiles

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Related terms

anterior margin
Used to refer to the margin of a fin from its origin to its apex.
bar
Used in ichthyology to describe a vertical or diagonal marking, normally with well-defined margins, often located on the flank of a fish.
cardioid scale
A scale possessing a distinct notch on the posterior margin.
cleithrum
Major bone of the pectoral girdle. Extends upward from the pectoral fin base and forms the rear margin of the branchial cavity. Articulates with the supracleithrum dorsally, the scapula and coracoid ventrally. Also known as proscapulum.
contact organ
Dermal, bony growth or spicule normally protruding from one or more fin rays or scale margins. Present on parts of the body or fins that come into contact with the female during spawning in males of some fishes.
crenate
Having a margin or edge consisting of shallow, rounded or scalloped projections. Similar to crenulate.
crenulate
Having a finely crenate edge or margin.
ctenoid
Comblike; having an edge or margin with multiple, tiny projections resembling the teeth of a comb.
cycloid scale
Scale type having a smooth margin.
dentate
Possessing a serrated or tooth-like edge or margin.
emarginate
Having a notched margin or edge. Often used in reference to a caudal fin with a slightly concave shape.
epaxial lobe
Section of the caudal fin located between the base and dorsal margin.
eye diameter
In ichthyology, the greatest distance between the margins of the eye.
lacrimal groove
Small groove located on the lower margin of the snout, just above the upper lip, in some fishes. Formed by a fold of skin under the edge of the lacrimal bone.
marginal
Of, relating to, or locate on the edge or margin of something; a semi-aquatic plant growing near the margin of a water body.
preopercle
Bone forming the posterior and lower margins of the cheek; the anteriormost bone of the opercle. Also known as the preoperculum.
ridge
In morphology, an elongate, raised strip, margin or border on a bone, tooth, tissue membrane, etc.
rift lake
Type of lake that forms in a rift zone or rift valley and often very deep with steep cliffs around the margins, also known as a rift valley lake, sag pond, or fault-trough lake. The largest freshwater lakes in the world are all of this type. Also used in the aquarium hobby in reference to the Rift Valley lakes of the East African rift.
serrae
Plural of serra. Usually used in reference to a saw-like edge or margin.
serrate
Having a notched or sawlike edge or margin.
sinuate
Having a wavy margin with strong indentations.
submarginal
Situated close to the margin of something.
terminal margin
In the fins of fishes, the space between the subterminal margin and fin tip.
trailing edge
The rear edge or margin of a moving body such as a fish fin.
ventral margin
Lower edge or margin.

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