The

order Order, ORDER or Orders may refer to: * Categorization, the process in which ideas and objects are recognized, differentiated, and understood * Heterarchy, a system of organization wherein the elements have the potential to be ranked a number of ...

Pygocephalomorpha is an extinct group of

peracarid The superorder Peracarida is a large group of malacostracan crustaceans, having members in marine, freshwater, and terrestrial habitats. They are chiefly defined by the presence of a brood pouch, or ''marsupium'', formed from thin flattened plat ...

crustacean Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean gro ...

s. Pygocephalomorpha were abundant from the Carboniferous until their

extinction Extinction is the termination of a kind of organism or of a group of kinds ( taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed ...

in the

Permian The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Pale ...

Families

The order contains extinct five families, and seven genera ''

incertae sedis ' () or ''problematica'' is a term used for a taxonomic group where its broader relationships are unknown or undefined. Alternatively, such groups are frequently referred to as "enigmatic taxa". In the system of open nomenclature, uncertain ...

'': * Jerometichenoriidae **'' Jerometichenoria'' * Notocarididae **'' Notocaris'' **'' Paulocaris'' * Pygocephalidae **'' Anthracaris'' **'' Mamayocaris'' **'' Pygocephalus'' * Tealliocarididae **''

Tealliocaris ''Tealliocaris'' is an extinct genus of pygocephalomorphans from the Carboniferous. Species The genus contains eight described species: *''Tealliocaris caudafimbriata'' *''Tealliocaris etheridgei'' *''Tealliocaris formosa'' *''Tealliocaris ...

'' * Tylocarididae **'' Chaocaris'' **'' Fujianocaris'' **'' Liocaris'' **'' Pseudogalathea'' **'' Tylocaris'' *Pygocephalomorpha **'' Bellocaris'' **'' Hoplita'' **'' Iraticaris'' **'' Permocaris'' **'' Pittinucaris'' **'' Pygaspis'' **'' Sosiocaris''

References

Prehistoric Malacostraca Carboniferous crustaceans Permian animals Carboniferous first appearances Permian extinctions Crustacean orders {{Carboniferous-animal-stub

Families

See also

References