†subclass Libristoma Fortey 1990

Trilobita - Libristoma

Alternative spelling: Librostoma

Full reference: R. A. Fortey. 1990. Ontogeny, hypostome attachment and trilobite classification. Palaeontology 33(3):529-576

Parent taxon: Trilobita according to M. C. Ebach and K. J. McNamara 2002

See also Fortey 1990 and Hughes 1994

Sister taxa: Abakanopleura, Acantholenus, Acrohybus, Aglagalia, Agnostida, Agraulaeva, Aguaraya, Aidarella, Aldonaiidae, Alomataspis, Altajaharpes, Amechilus, Amgaspididae, Amginouyia, Ampellatocephalina, Anacopodia, Anomocarellidae, Antagmidae, Antagmopleura, Antatlaeva, Asaphida, Atopidae, Aulacopleurida, Auritamidae, Avalonia, Avascutellum, Avoninidae, Barklyella, Bathynotellus, Bathynotidae, Beikedamaspis, Bergerolimbus, Bicornipyge, Blayacina, Bondarevites, Brevitermierella, Bridgeia, Carmon, Catadoxides, Chakasskia, Changshaniidae, Chinensis, Chondroparia, Conoides, Cornovica, Corynexochida, Costonia, Crossoura, Curiaspis, Cuyanaspis, Cyclolenzellina, Dalmanites troosti, Deltacare, Dikelocephalidae, Edganocare, Ellipsocephaloididae, Ellipsuella, Ellsaspis, Entomostracites, Entsyna, Eodiscida, Eosaukia, Erbenochile, Esseigania, Eulomella, Eutrilobita, Fabulaspis, Folliceps, Fritzaspis, Galahetes, Gentilapsis, Gigmpeltis, Gigoutella, Giordanella, Goycoia, Hamashania, Harpetida, Harpida, Harpididae, Hercantyx, Hicksia, Holocephalinidae, Howelluella, Ignotogregatidae, Indigestus, Indiligens, Ishpella, Isocolidae, Issafenia, Issafeniella, Ityophoridae, Jamrogiidae, Jonotus, Jubileia, Judaiella, Juriietella, Kamlacus, Kanfuqingia, Kerbinella, Kinsabia, Knechtelia, Kolpura, Kujandina, Leptopilus, Levisia, Lichida, Liriamnica, Llanoaspididae, Lomsucaspis, Lotosoides, Loxonepea, Loxopeltis, Lusampa, Mannschreckia, Mapaniidae, Mataninella, Mecophrys, Megalaspidicus, Megalurites, Meisterella, Meneghinella, Metapopristis, Missisquoiidae, Monkaspididae, Moretarva, Namanoiidae, Naraoiida, Neomalungia, Nepeidae, Ninaspis, Norina, Odontopleurida, Ogygiocaridinae, Olenellida, Olenida, Onchonotopsidae, Opisthoparia, Ordosiidae, Orictocara, Orienturus, Otekmaspis, Otenaspella, Oxygonaspis, Paichiashania, Palaeolentus, Paleoaethia, Palmeraspis, Paraplagiura, Paraplesiograulos, Pararania, Peculicephalina, Perissopyge, Phacopida, Phylacteridae, Piliolites, Planolimbus, Pliomerellus, Poculicephalina, Polycyrtaspididae, Proetida, Proparia, Pseudoacicaudus, Pseudoclelandia, Pseudocrecephalaspina, Pseudoliostracina, Pseudosalteria, Pseudotermierella, Ptyttstrigis, Punctaspis, Redlichaspis, Redlichiida, Remopleuridacea, Repinaella, Resseria, Resseropsis, Rochaeva, Rowia, Sailycaspis, Sarkiidae, Scutelluidae, Sectigena, Selenocoryphe, Serksia, Serksioides, Sibiriopeltis, Smeathenia, Sonoraspis, Sphaerocare, Spizharaspis, Stittaspis, Sunaspididae, Tadakoustia, Taidonorus, Taplimella, Tazemmourtia, Thymurus, Tongxingaspis, Toxotis, Trapezocephalina, Trilobus, Trinia, Tuyunaspis, Ullaspis, Ulrickaspis, Utiidae, Validaspis, Volonellus, Westergardia, Whittardolithus, Winsteria, Wuaniidae, Zigzuella

Subtaxa: Ptychopariida

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Distribution:

• Silurian of Australia (1 collection), Canada (1: Northwest Territories)

• Ordovician of Argentina (24), Australia (6), Bolivia (4), Canada (27: Alberta, Newfoundland, Newfoundland and Labrador, Northwest Territories, Quebec, Yukon), China (49), the Czech Republic (1), France (2), Iran (6), Ireland (2), Italy (3), Kazakhstan (3), Mexico (10), Norway (15), the Russian Federation (22), South Korea (1), Spain (2), Sweden (8), the United Kingdom (8), United States (41: California, Idaho, Montana, Nevada, New Mexico, New York, Texas, Utah, Vermont)

• Llandeilo of Canada (1: Yukon), China (2)

• Chazy of United States (7: New York)

• Whiterockian of Canada (8: Newfoundland and Labrador, Quebec), Norway (2), United States (13: Nevada, New York, Vermont)

• Cassinian of the United Kingdom (1)

• Arenig of Argentina (1), Australia (1), Bolivia (1), Canada (3: Newfoundland and Labrador), China (3), Norway (4), the Russian Federation (1), Sweden (3), the United Kingdom (2), United States (1: North Dakota)

• Arenigian of Canada (1: Northwest Territories), China (6), United States (1: Utah)

• Ayusokkanian of Kazakhstan (20), the Russian Federation (7)

• Marjumian of Canada (14: Newfoundland), Greenland (9), United States (26: Alabama, Arizona, Georgia, New York, Texas, Utah, Vermont)

• Cambrian to Ordovician of Australia (1), Canada (1: Quebec), the Russian Federation (2)

• Cambrian of Antarctica (5), Argentina (5), Australia (28), Canada (198: Alberta, Alberta-British Columbia, Brithish Columbia, British Columbia, New Brunswick, Newfoundland, Newfoundland and Labrador, Northwest Territories, Nunavut, Quebec, Yukon, Yukon Territory, Yukon and Northwest Territories), China (414), the Czech Republic (24), Denmark (1), France (8), Greenland (10), India (31), Iran (3), Italy (1), Kazakhstan (77), Kyrgyzstan (1), Mexico (2), Morocco (4), North Korea (1), Norway (2), the Russian Federation (93), South Korea (33), Spain (15), Sweden (1), Turkey (24), the United Kingdom (3), United States (776: Alaska, Arizona, Arkansas, California, California-Nevada, Idaho, Idaho/ Utah, Indiana, Massachusetts, Minnesota, Missouri, Montana, Nevada, Nevada and California, Nevada and Utah, New Mexico, New York, Pennsylvania, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Wisconsin, Wyoming, Wyoming-Montana), Vietnam (1)

Total: 2139 collections including 4084 occurrences

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