- carapace costae
- Closely spaced radial ridges, grading from fine to coarse, that become obsolete near umbo and do not cross it (=radial lirae, radial riblets, accessory ribs) (e.g., Conchostraca, especially Estheriellidae, in which valves generally have more than 5 costae) [Moore and McCormick, 1969].(Order Diplostraca):Closely spaced radial ridges, grading from fine to coarse, not crossing to umbo. (Syn. radial lirae) [McLaughlin, 1980].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.