Indentation on posterior margin of carapace (e.g., some Alpheidae). (Syn. cardiac incision) [Moore and McCormick, 1969].
Indentation on posterior margin of carapace [McLaughlin, 1980].
(Order Decapoda):
In shrimp-like (natantian) decapod, notch on posterior margin of carapace [Stachowitsch, 1992].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.