English: An illustration of the skull of Trimerorhachis insignis by Edward Drinker Cope, published posthumously in 1915 in Hitherto unpublished plates of Tertiary Mammalia and Permian Vertebrata Volume 3 Part 2.
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{{Information |Description ={{en|1=An illustration of the skull of ''Trimerorhachis insignis'' by Edward Drinker Cope, published posthumously in 1915 in ''Hitherto unpublished plates of Tertiary Mammalia and Permian Vertebrata'' Volume 3 Part 2.}} |Sou