These additional types of virtual file systems are listed for your information. They do not require administration.
FIFOFS (first-in first-out) - Named pipe files that give processes common access to data
FDFS (file descriptors) - Provides explicit names for opening files using file descriptors
NAMEFS - Used mostly by STREAMS for dynamic mounts of file descriptors on top of files
SPECFS (special) - Provides access to character special and block devices