Definitions

(Taxon-specific: Class Ostracoda) Along inner margin of valve, thickened, calcified section of inner lamella. Space between outer lamella and duplicature is termed vestibule. Medially directed surface of duplicature contacts opposite member when carapace is closed and may bear various ridges and grooves. [Stachowitsch, 1992]
(Taxon-specific: Class Ostracoda) That part of border of shell with calcareous peripheral part of inner lamina in contact with, or separated by vestibule from, outer lamina, generally narrow, sometimes extensive. [McLaughlin, 1980]