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We report the experimental confirmation of the collective transverse plasmamodes excited by the Josephson vortex lattice in stacks of intrinsic Josephsonjunctions in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+x}$ single crystals. Theexcitation was confirmed by analyzing the temperature ($T$) and magnetic field($H$) dependencies of the multiple sub-branches in the Josephson-vortex-flowregion of the current-voltage characteristics of the system. In the near-staticJosephson vortex state for a low tunneling bias current, pronouncedmagnetoresistance oscillations were observed, which represented atriangular-lattice vortex configuration along the c axis. In the dynamic vortexstate in a sufficiently high magnetic field and for a high bias current,splitting of a single Josephson vortex-flow branch into multiple sub-brancheswas observed. Detailed examination of the sub-branches for varying $H$ fieldreveals that sub-branches represent the different modes of the Josephson-vortexlattice along the c axis, with varied configuration from a triangular to arectangular lattices. These multiple sub-branches merge to a single curve at acharacteristic temperature, above which no dynamical structural transitions ofthe Josephson vortex lattice is expected

Collective Josephson vortex dynamics in a finite number of stacked intrinsic Josephson junctions