Amongst the non-insect classes of the , both and have antenna, but do not.
In the , antennae are necessary for proper time-compensated orientation during migration.
Arthropod Relationships: Phylogenetic Analysis 1st ed.
The annuli are not true flagellomeres, and in a given insect species the number of annuli generally is not as consistent as the number of flagellomeres in most species.
The pair attached to the first segment of the head are called primary antennae or antennules.
This pair is generally uniramous, but is biramous in and.