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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.