Alternative spelling: Petalichthida
Synonym: Petalichthyiformes
Full reference: O. Jaekel. 1911. Die Wirbeltiere. Eine Übersicht über die Fossilen und Lebenden Formen [The Vertebrates. An Overview of the Fossil and Living Forms] viii-252
Parent taxon: Placodermi according to G. C. Young 2010
See also Grande and Eastman 1986, Long 2011 and Nelson et al. 2016
Sister taxa: Acanthothoraci, Acanthothoraciformes, Antiarcha, Antiarchiformes, Arthrodira, Asiacanthus, Austroptyctodus, Bianchengichthys, Brindabellaspida, Campbellodus, Changyonophyton, Coccostei, Coelosteichthys, Deinodus, Entelognathus, Hybosteus, Neopetalichthys, Nessariostoma, Oestophorus, Petalichthida, Petalichthyida, Phyllolepida, Pseudopetalichthyida, Pseudopetalichthyiformes, Ptychostei, Ptyctodontida, Rhenanida, Rhenaniformes, Sedowichthys, Stensioellida, Tollichthys, Wangolepis, Yunnanacanthus
Subtaxa: none
Distribution:
• Devonian of Australia (3 collections), Canada (1: Nunavut), China (7), Germany (2), the Russian Federation (2), Svalbard and Jan Mayen (1), United States (6: Indiana, Michigan, Ohio, Pennsylvania)
• Silurian of China (1)
Total: 23 collections including 25 occurrences