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flagellum, flagellomere

Alloterra trilineata - Alloterra trilineatus - female Antenna - Clinohelea bimaculata - female Blue Streaks (ventral head) - Psorthaspis planata - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
No Taxon (Glossary)
No Taxon (F)
No Taxon flagellum, flagellomere
Identification
The three true segments of an insect antenna are the: scape (base), the pedicel (stem), and the flagellum, a whip-like structure containing one unit or divided into 2 or more units. Each unit of the flagellum is referred to as a flagellomere. These individual flagellomeres are not homologous to segments, but the whole flagellum is.
See Also
Each unit of the antennae, including the scape, pedicel, AND each flagellomere, are each often called antennomeres. All flagellomeres are antennomeres but not all antennomeres are flagellomeres. Thus, the number of antennomeres on an insect is generally the number of flagellomeres PLUS 2 (the scape and the pedicel), and the number of flagellomeres is just the number of antennomeres excluding the scape and pedicel.
Internet References
Images linked to above are from Tree of Life and Matthew Kweskin (dead links as of 27 November 2020--replaced with links to BugGuide glossary entries)