The costae, longitudinal ribs or rows of spines on the outer surface of the theca.
costae of ovarian receptacle with short opposite tubular branches; NOT connected by a membrane.
Intercostal: between veins or costae; usually in the narrow grooves between veins in the costal region of a wing.
costae of ovarian receptacle connected by a membranous expansion.
Coeloplana is of similar form and habit, with two Ctenophoran tentacles: it has no costae, but is uniformly ciliated.
Its costae are very short, and retrusible; its two tentacles are pinnate and are also retrusible.
Spanish costa "coast," from same Latin source as English coast (n.). Used in Britain from 1960s in jocular formations (costa geriatrica, costa del crime, etc.) in imitation of the names of Spanish tourist destinations.
costa cos·ta (kŏs'tə)
n. pl. cos·tae (-tē)
A rodlike internal supporting organelle that runs along the base of the undulating membrane of certain flagellate parasites. Also called basal rod.