Prosthecate bacteria are a non-phylogenetically related group of Gram-negative bacteria that possess appendages, termed prosthecae. These cellular appendages, also known as stalks, are neither pili nor flagella, as they are extensions of the cellular membrane and contain cytosol.[1] One notable group of prosthecates is the genus Caulobacter.
{{cite book}}: CS1 maint: multiple names: authors list (link)