Pterichthyodes is a genus of antiarch placoderm fishes from the Devonian period. Actinolepidae is an extinct family of placoderm fishes which lived during the Early Devonian period. Homosteus is a genus of flattened arthrodire placoderm from the Middle Devonian. Diandongpetalichthys baojiaoshanensis is an extinct petalichthid placoderm from the Early Devonian of China. The placoderm claspers are not homologous with the claspers in cartilaginous fishes. Hollardosteus marocanus is a brachythoracid arthrodire placoderm from the Middle Devonian of Morocco. Microbrachichiidae is identified as earliest branching placoderm lineage with claspers. The earliest identifiable placoderm fossils are from China and date to the early Silurian. Gorgonichthys clarki is an extinct arthrodire placoderm of the superfamily Dinichthyloidea. "D. magnificus" is a large placoderm from the Frasnian Rhinestreet Shale of New York. Much later, the exquisitely preserved placoderm fossils from Gogo reef changed the picture again. Parayunnanolepis xitunensis is an extinct, primitive antiarch placoderm. Placolepis is an extinct genus of phyllolepid placoderm first discovered in New South Wales. Petalichthyida is an extinct order of small, flattened placoderm fish. Stensioella heintzi is an enigmatic placoderm of arcane affinity.