Pygocephalomorpha

The order Pygocephalomorpha is an extinct group of peracarid crustaceans. Pygocephalomorpha were abundant from the Carboniferous era until their extinction in the Permian era.

This group constituted part of the freshwater and aquatic crustacean assemblages. The carapace is relatively axially shortened, with a prominent gastric region. Laterally, a cervical groove is visible, with carapace margins which is defined by an acute spine or process, including a somewhat well developed  branchiostegites"

Families
The order contains extinct five families, and seven genera incertae sedis:


 * Jerometichenoriidae Schram, 1978
 * Jerometichenoria Schram, 1978
 * Notocarididae Brooks, 1962
 * Notocaris Broom, 1931
 * Paulocaris Clarke, 1920
 * Pygocephalidae Brooks, 1962
 * Anthracaris Brooks, 1962
 * Mamayocaris Brooks, 1962
 * Pygocephalus Huxley, 1857
 * Tealliocarididae Brooks, 1962
 * Tealliocaris Peach, 1908
 * Tylocarididae Taylor, Yan-Bin & Schram, 1998
 * Chaocaris Shen, 1983
 * Fujianocaris Taylor, Yan-Bin & Schram, 1998
 * Liocaris Beurlen, 1931
 * Pseudogalathea Peach, 1883
 * Tylocaris Taylor, Yan-Bin & Schram, 1998
 * Pygocephalomorpha incertae sedis
 * Bellocaris Fong, 1972
 * Hoplita Pineiro, Morosi & Ramos, 2012
 * Iraticaris Adami-Rodrigues, Pazinato & Pinto, 2016
 * Permocaris Adami-Rodrigues, Pazinato & Pinto, 2016
 * Pittinucaris Adami-Rodrigues, Pazinato & Pinto, 2016
 * Pygaspis Beurlen, 1934
 * Sosiocaris Jones, 2015