Its vertebral column had amphicoelus centra and 3 sacral vertebrae. These facets are posteriorly inclined and located posteriorly on the ventral surfaces of the centra. Amphicoelous centra often are integrated with a full notochord. The second and third sacral centra were fused; the suture connecting them was still visible. This shark is known from its fossilized teeth and vertebral centra. Small holes called foramina subcentralia are found on the ventral surface of the centra. The cervical vertebrae were platycoelous and had large, massive centra (bodies) and low neural arches. Megalodon is represented in the fossil record by teeth, vertebral centra, and coprolites. There is a complete fusion between centra, neural arches, zygapophyses, and sometimes neural spines. The centra of the dorsal vertebrae of the back were similar in size. It comprises 150 vertebral centra, with the centra ranging from to in diameter. The cervical ribs are not fused to the centra. The dorsals (back vertebrae) are also long, and also possess "pinched" centra. This is evidenced by the circular vertebra centra of "Cretalamna". After a scouting mission at Centra, the three soldiers are separated and Laguna is injured.