†suborder Pygocephalomorpha Beurlen 1930 (arthropod)
Parent taxon: Peracarida according to P.G. Pazinato et al. 2016
See also Brooks et al. 1969, Schram 1978 and Schram 1979
Sister taxa: Amphipoda, Bochusacea, Diaphanosoma, Hemicaridea, Lophogastrida, Mancoida, Mictacea, Mysida, Oxyuropoda, Stygiomysida, Thermosbaenacea
Subtaxa: Chaocaris Hoplita Jerometichenoriidae Liocaris Notocarididae Pygocephalidae Sosiocaris Tealliocarididae Tylocarididae
Ecology: epifaunal omnivore
Distribution:
• Permian of Brazil (3 collections), China (3), Italy (1), the Russian Federation (1)
• Carboniferous of Germany (1), the United Kingdom (6), United States (2: Illinois, Pennsylvania)
• Devonian of Belgium (3)
Total: 20 collections including 23 occurrences