Definitions
Frontal appendage
- One pair of filaments arising in many Anostraca from bases of antennae but independent of them; may be ramified. [Moore and McCormick, 1969]
- (Taxon-specific: Order Diplostraca) Frontal organ. [Stachowitsch, 1992]
- (Taxon-specific: Order Anostraca) Paired filaments arising from bases of antennae but independent of them. [McLaughlin, 1980]
- (Taxon-specific: Order Anostraca) Unpaired median process projecting from head between antennae. (unbranched, branched; with two terminal branches, with three terminal branches; shorter/longer than antenna). [Stachowitsch, 1992]