Exploring phylogenetic relationships of Pteraspidiformes heterostracans (stem-gnathostomes) using continuous and discrete characters Author Randle, Emma Author Sansom, Robert S. text Journal of Systematic Palaeontology 2017 2016-07-20 15 7 583 599 http://dx.doi.org/10.1080/14772019.2016.1208293 journal article 10.1080/14772019.2016.1208293 1478-0941 10883180 BF5255A1-1417-432B-AC64-BF132A0BCC65 Lampraspis Denison, 1970 Type species. Lampraspis tuberculata Denison, 1970 . Revised diagnosis. A Protaspididae with wide shield and branchial opening in advance of the posterior end of dorsal plate; ornament of undulating tuberculated ridges; pre-oral field which lacks a pre-oral surface; rostral plate with rounded orbital notch; rostral plate well rounded anteriorly and separated from the dorsal plate by an orbito-pineal belt; scale-like dorsal spine and scale-like cornual plates.