Have you heard of this one? Wikipedia says it’s one of the biggest dinosaurs ever:

Not much of Argentinosaurus has been recovered. The holotype included only a series of vertebrae (six from the back, five partial vertebrae from the hip region), ribs of the right side of the hip region, a part of a rib from the flank, and the right fibula (lower leg bone). One of these vertebra was 1.59 meters tall, and the fibula was about 1.55 meters (58 inches).^[2] In addition to these bones, an incomplete femur (upper leg bone, specimen number MLP-DP 46-VIII-21-3) is assigned to Argentinosaurus; this incomplete femur shaft has a minimum circumference of about 1.18 meters.^[3] The proportions of these bones and comparisons with other sauropod relatives allow paleontologists to estimate the size of the animal.

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