Pterygometopidae

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: †Trilobitomorpha
Classis: †Trilobita
Ordo: †Phacopida
Subordo: †Phacopina
Superfamilia: Phacopoidea
Familia: Pterygometopidae
Genera: Achatella - Bolbochasmops - Calliops - Calyptaulax - Carinopyge - Ceratevenkaspis - Chasmops - Denella - Elasmaspis - Eomonorachus - Estoniops - Evenkaspis - Ingriops - Isalaux - Isalauxina - Keilapyge - Liocnemis - Monorakos - Oculichasmops - Oelandiops - Parevenkaspis - Podowrinella - Pterygometopus - Rollmops - Ruegenometopus - Sceptaspis - Schmidtops - Scopelochasmops - Toxochasmops - Tricopelta - Truncatometopus - Upplandiops - Uralops - Valdariops - Vironiaspis - Volkops - Yanhaoia
Name
Pterygometopidae Reed 1905

The Pterygometopidae are a family of trilobites, that is known from the Floian to the Katian (Ordovician), and reappears from the Telychian to the Sheinwoodian (Silurian). As part of the Phacopina suborder, its members have schizochroal eyes.
Distribution

The Pterygometopinae may be exclusive to Baltica and are known from the Floian to the Upper Katian with 49 species in 14 genera. The 71 species from 8 genera belonging to the Eomonorachinae occur mostly in Laurentia from the Floian. One genus, Podowrinella, is known from the Silurian, and may be the sister taxon of the Phacopidae. 50 species in 8 genera have been assigned to the Chasmopinae. They are exclusive to Baltica from the Darriwilian to the Sandbian. The subfamily spread to Avalonia and Laurentia in the Katian, at the end of which they became extinct. 32 species of Monorachinae in 6 genera occurred on the paleocontinent Siberia, now parts of northeastern Russia and of Alaska, from the Sandbian to the Upper Katian.[1]
Genera

The following genera are assigned to the Pterygometopidae:[2]

Achatella
Bolbochasmops
Calliops
Calyptaulax
Carinopyge
Ceratevenkaspis
Chasmops
Denella
Elasmaspis
Eomonorachus
Estoniops
Evenkaspis
Ingriops
Isalaux
Isalauxina
Keilapyge
Liocnemis
Monorakos
Oculichasmops
Oelandiops
Parevenkaspis
Podowrinella
Pterygometopus
Rollmops
Ruegenometopus
Sceptaspis
Schmidtops
Scopelochasmops
Toxochasmops
Tricopelta
Truncatometopus
Upplandiops
Uralops
Valdariops
Vironiaspis
Volkops
Yanhaoia

References

J.M. Adrian (2014). "20. A synopsis of Ordovician trilobite distribution and diversity". In D.A.T. Harper; T. Servais (eds.). Early Palaeozoic Biogeography and Palaeogeography. Memoirs of the Geological Society of London. Vol. 38. Geological Society of London. p. 490. ISBN 978-1862393738.
S. M. Gon III. "Order Phacopida". Retrieved November 16, 2010.