This is one of my favorite prepped crabs! It has been prepared on both sides with great care, leaving enough of the concretion to frame the extinct Tumidocarcinus giganteus crab.
As with most examples of this species of crab, the right claw is slightly bigger than the left.
It has been digitized using photogrammetry.
Watch it being unboxed on YouTube
Age: ~12 million years old (Miocene)
Location: South Island, New Zealand
Size: 16cm long, 3cm wide, 13cm high (6.3" x 1.2" x 5.1")
Weight: 740g (1.6lbs)