解説Geographical distribution of chasmataspidid fossils.png
English: Geographic distribution of chasmataspidids. Occurrences are shown on paleogeographic reconstructions for the Middle–Late Ordovician, Early–Middle Silurian, and Early–Middle Devonian. Hoplitaspis is indicated by a star while other chasmataspidids are represented by circles. Ba = Baltica, Eu = Euramerica, Go = Gondwana, La = Laurentia, Si = Siberia. Paleogeographic reconstructions