Final answer:
The large continent that consisted of the world's landmass during the Paleozoic Era was called Pangaea, including all of today's major land masses.
Step-by-step explanation:
During the Paleozoic Era, the world's landmass consisted of one large continent called Pangaea. This supercontinent formed during the Permian Period and included all of today's major land masses in a single landmass configuration. As the Paleozoic Era progressed, the landmasses began moving together, eventually resulting in the formation of Pangaea. This supercontinent played a significant role in the Earth's history, including contributing to the Permian extinction, which is known as the most massive extinction ever recorded.