Rounded to angular indentation at front of cladoceran carapace along dorsal edge, exposing rear part of head [Moore and McCormick, 1969].
(Order Cladocera):
Cervical notch [Stachowitsch, 1992].
(Order Cladocera):
Rounded to angular indentation anteriorly along dorsal edge of carapace (Cladocera) [McLaughlin, 1980].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.