See: carina [Martin, 2005].
(Order Diplostraca):
Ridge-like elevation of posterior hinge line; produced into series of serrations by continued growth lines [Stachowitsch, 1992].
(Order Mysida):
In certain mysidaceans, one of several elevated ridges on carapace. According to position one may distinguish dorsal, midlateral, and lower lateral keels [Stachowitsch, 1992].
(Class Ostracoda):
Posterior extension of carapace. (Syn. caudal process) [Cohen, Peterson, and Maddocks, in press].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.