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Dermal spines in sauropods
Not only do some sauropods (Shunosaurus & Omeisaurus) have clubbed tails,
but now it appears some diplodocid sauropods may have sported a row of
dermal spines (some as tall as 18 cm).
Small spines are found at the whiplash part of tail, making the tail a
very useful defensive weapon against predators.
Stephen A. Czerkas, 1992. "Discovery of dermal spines reveals a new look
for sauropods" Geology v.20 p.1068-1070
---John Schneiderman <email@example.com>