Fig. 1From: Systemic distribution of medullary bone in the avian skeleton: ground truthing criteria for the identification of reproductive tissues in extinct AvemetatarsaliaKnown phylogenetic distribution of MB in Neornithes. The phylogenetic relationships of extant bird groups follow Prum et al. [52]. Superimposed upon this phylogeny is the documented presence of MB, based on data gathered by Werning [43] and the current studyBack to article page