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“Apatosaurus” minimus left ischium
Here is another illustration that I prepared for the forthcoming “Apatosaurus” minimus redescription. Compare this with the sacrum and fused ilia from the previous post.
Left ischium of AMNH 675, “Apatosaurus” minimus. Left column: proximal. Middle column, top to bottom: medial (inverted), dorsal, lateral, ventral (all with proximal to left). Right column, distal. Click through for very high resolution (4810 x 5229).
Can you tell what it is yet?
By the way, I’d appreciate some advice on the directional nomenclature here. Since I’ve illustrated the lateral view with the long axis horizontal, I’m referring to the margin that’s closest to the tail as “dorsal” and the margin closest to the ground as “ventral”. But since the ischium is directed more or less posteroventrally, I guess you could equally make a case for designating those two aspects as “posterior” and “anterior” respectively. The third alternative is to embrace the diagonality and call them “posterodorsal” and “anteroventral”. Is one of these schemes conventional?
Read more at Sauropod Vertebra Picture of the Week
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