Noun(1) a riblike part of a plant or animal (such as a middle rib of a leaf or a thickened vein of an insect wing(2) any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in humans (and similar bones in most vertebrates(3) a riblike part of a plant or animal (such as a middle rib of a leaf or a thickened vein of an insect wing)(4) any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in humans (and similar bones in most vertebrates) [also: costae (pl)]
Noun(1) a riblike part of a plant or animal (such as a middle rib of a leaf or a thickened vein of an insect wing(2) any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in humans (and similar bones in most vertebrates(3) a riblike part of a plant or animal (such as a middle rib of a leaf or a thickened vein of an insect wing)(4) any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in humans (and similar bones in most vertebrates) [also: costae (pl)]
(1) It resulted in outgrowths and duplications of the costa region of the wing.(2) The forewings generally are reduced to the region immediately adjacent to the costa , having separated along the radius and cubitus veins.(3) The main part of the shell is coarsely commarginally lamellose and lacks radial costae .(4) Wall thickness is 10-26 m, becoming thicker at the corners of the chamber where it may bulge outwardly to produce coarse longitudinal costae .(5) It has strong divaricate ornamentation of coarse costae and/or small plicae, which bear low, close nodes, but which cover both the anterior and posterior faces of the shell.(6) The internal molds are smooth with exception of traces of the concentric costae on the rostral face.(7) He differentiated his new species from S. robusta by its more numerous costae on the shell flanks.
