simple seta hair In addition to being applied to a seta in a broad sense, Belkin used the term "hair" for a specific type of seta "a seta with long, slender stem and attenuate apex". Note that a seta with these characteristics is by definition a simple single seta. It may be described as a long slender simple single seta with an attenuate apex. TGMA:0001428 TGMA:0001428 default_namespace