Definitions
Fornix
- (Taxon-specific: Order Cladocera) Ridge in lateral part of cephalon above insertion of antennal muscles. [McLaughlin, 1980]
- (Taxon-specific: Order Cladocera) Ridge-like extension of each side of head; may merge with rostrum to form ventrally directed, beak-like structure. (covering/not covering most of antennules; simple, forming spinous processes). [Stachowitsch, 1992]