- conchostracan carapace ribs
- Strong radial ridges radiating from and across umbo of conchostracan carapace, with intervals of variable width between any pair and commonly nodose at intersections of growth lines; may be partial or embryonic in expression; synonyms include longitudal striae, carinae, radials, diagonal ridges, radial costae, and keels. (Characterize Leaiidae, never exceeding five in number on any given leaian valve; ribs also occur in Protomonocarina and Limnadiopsileaia.) [Moore and McCormick, 1969].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.