Palaeos Vertebrates Placodermi: Actinolepidoidei
lwD-upD.
Peak(?) of nuchal plate near geometric center; ornamented with concentric ridges.
References: Janvier (1996).
lwD(-mD?) of NAm, Spitzbergen, Aus.
radiation center of paranuchal plate near topographic center; elongated thoracic armor; spinal plates long & frequently ornamented with tubercles in concentric pattern.
011014.