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Pygocephalomorpha Temporal range: Carboniferous–Permian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Malacostraca
Superorder:	Peracarida
Order:	†Pygocephalomorpha Beurlen, 1930
Families
Jerometichenoriidae Notocarididae Pygocephalidae Tealliocarididae Tylocarididae

The order Pygocephalomorpha is an extinct group of peracarid crustaceans. Pygocephalomorpha were abundant from the Carboniferous era until their extinction in the Permian era.^[1]

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"^[2]

Families

The order contains extinct five families, and seven genera incertae sedis:^[3]^[4]

†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

References

^ Marjorie L. Reaka-Kudla (2002). "Habitat specialization and its relation to conservation policy in Crustacea". In Elva Escobar-Briones, Fernando Alvarez (ed.). Modern approaches to the study of Crustacea. Springer. pp. 211–221. ISBN 978-0-306-47366-1.
^ Jones, Feldmann, Schweitzer, Reitano, Insacco, Wade , Rodney, Carrie , Agatino , Gianni (1 September 2015). "New Pygocephalomorph (Peracarida) from the Permian of the Sosio Valley (Sicily, Italy)". Journal of Crustacean Biology. 35 (5): 627–632. doi:10.1163/1937240X-00002367 – via Oxford Academic.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ WoRMS. "Pygocephalomorpha". World Register of Marine Species. Retrieved 26 December 2022.
^ WoRMS. "Pygocephalomorpha incertae sedis". World Register of Marine Species. Retrieved 26 December 2022.

Orders of Malacostraca

Kingdom Animalia
Phylum: Arthropoda
Subphylum: Crustacea

Phyllocarida

Hoplocarida

Eumalacostraca

Syncarida	Anaspidacea Bathynellacea †Palaeocaridacea
Peracarida	Spelaeogriphacea Thermosbaenacea Lophogastrida Mysida (opossum shrimp) Stygiomysida Mictacea Bochusacea Amphipoda Ingolfiellida Isopoda †Pygocephalomorpha Tanaidacea Cumacea (hooded shrimp)
Eucarida	†Angustidontida Euphausiacea (krill) Decapoda (shrimp, prawns, crayfish, lobsters, crabs, etc.)

The three most speciose orders are marked in bold; obelisks (†) mark extinct orders.

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See also

References