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Autotomous lizard tail vertebrae contain fracture planes. Original tails of (A) Anolis carolinensis, (B) Hemidactylus frenatus, (C) Heteronotia binoei, and (D) Hoplodactylus duvaucelii analyzed by micro computed tomography and highlighting the diversity of fracture plane position and structure. Open arrowheads denote intravertebral fracture plane. White-filled arrowheads mark intervertebral pads (ip). Black-filled arrowheads identify Z-joints (z). Bar = 100 μm.
