The basioccipital lies in front of the opening, the two exoccipitals lie to either side, and the larger supraoccipital lies to the posterior, and forms at least part of the rear of the cranium.
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The type species, Rhamphinion jenkinsi, was described and named in 1984 by Kevin Padian, based on holotype MNA V 4500, a partial skull including the occipital region, a partial left jugal, a fragment of the lower jaw including two preserved teeth and the impression of a third, and one other fragment that could not be identified.
Foramen magnum, a large opening in the occipital bone of the cranium