hinge line
Mid-dorsal line of junction of two valves composing carapace, permitting movement between them (e.g., Conchostraca, Ostracoda, Phyllocarida) [Moore and McCormick, 1969].
Middorsal line of junction of two valves of carapace, permitting movement between them [McLaughlin, 1980].
(Order Diplostraca):
Longitudinal middorsal line of carapace. Considered either to mark connection of two valves of carapace or to represent thinner and most flexible region of continuous shield. (straight, in an arc) [Stachowitsch, 1992].

Crustacea glossary. . 2011.

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