There is no histologic evidence of an annular structure anteriorly, where the mitral valve leaflet is contiguous with the posterior aortic root.
2.
The same speceimen preserved a cross section of the ectotypanic ring, showing it to be an annular structure which was fused to the margin of the bulla similar in structure to modern platyrrhines.
3.
While the Arctic Oscillation has an annular structure centered over and covering the entire Arctic, the Arctic dipole anomaly has two poles of opposite sign : one over the Canadian Arctic Archipelago and northern Greenland, the other over the Greenland and Barents Seas.
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