Plesiosaur Ribs and Spinous Processes

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In ascending order, from tail to neck, spinous processes and ribs alternate in size. The smallest spinous process occupies the most distant position on the tail, while the next largest one takes its place closest to the skull on the neck. Meanwhile, rib number 27, being the largest of all, finds a spot in the final slot of the front half of the ribs, and rib number 26, the second largest, settles into the first position in the rear spine section.