Filiform is a term used to describe any structure that is long and thin and with a uniform cross section (i.e. the structure doesn't taper).
In entomology, the term is most often used in the context of filiform antennae. Filliform antennae are the most basic form of insect antennae. The antennae are thread-like and comprise many individual segments that are uniform in size.
The large filiform antennae of a solitary bee.
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