One of the riblike longitudinal ridges on the exterior of many corals.
The forward edge of both the fore and hind wings.
The nerve or mid-rib of a leaf.
Latin = rib. adjective - costal.
A longitudinal wing vein, usually forming the anterior or leading edge of the wing.
the midline vein, nerve or midrib of a bryophyte leaf (or phyllid).
rounded ridge on the surface of a shell, larger than a cord.
longitudinal vein running along leading edge of wing.
The forward edge of a butterfly's wing.
The first vein of the wing.
The most anterior wing vein, usually marking the anterior margin of an insect wing.
The leading edge of a wing, between the base and the apex.
The most anterior (leading) edge of a wing. Also called costal margin.
the front edge or border of certain insect wings; the rib-like structure of certain animals
a rib; a midrib or midvein (when it is the only vein).
Also called the costal vein, the major longitudinal vein forming the leading edge of the wing.
Radial ridge extending from apex to margin. Also refers to any coarse radial rib. (plural : costae).
The midvein of a minor divsion of a fern leaf.
a rib; the midvein of a leaf
The leading margin of the forewing or hindwing in butterflies and moths.
The costa is the front (anterior) margin of a butterfly or moth's wing - the leading edge of the wing.