Basic Antenna
A basic insect antenna is composed of a basal (Base) segment called the scape, which may vary in length, and then a number of smaller segments which can differ significantly depending on the type. The shape and the number of segments is very important for distinguishing insect groups.
Filiform antenna are long and thread like. Mantids, booklice, psocids and earwigs have filiform antenna. Mayflies have shorter filiform antenna (about the length of their heads), Dragonflies and Damselflies have tiny pointed antenna. The length of cricket and grasshopper and stick and leaf insects antenna vary greatly. Lice only have 3 to 5 segmented antenna
Moniliform Antenna are bead like
Clubbed antenna have a swollen club like tip. Antenna in butterflies are clubbed.
Elbowed antenna are prominently bent, often at 90 degrees and have a large scape
The last few segments of lamellate antenna have fan-like expansions. Moth antenna can vary from filiform to fan like.
These antenna are feather like.
As the name implies, serrate antenna have tooth like, or saw like segments.
These antenna are short and stout with a thin, bristle like end.