FIGURE 4. ETMNH 4917, Ambystoma sp. trunk vertebra exhibiting an open notochordal canal indicative of neoteny in (1) dorsal, (2) anterior, (3) posterior, and (4) left lateral views.
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FIGURE 4. ETMNH 4917, Ambystoma sp. trunk vertebra exhibiting an open notochordal canal indicative of neoteny in (1) dorsal, (2) anterior, (3) posterior, and (4) left lateral views.
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