†family Trinucleidae Hawle and Corda 1847 (trilobite)

Trilobita - Trinucleida - Trinucleidae

Parent taxon: Trinucleida according to A. Bignon et al. 2020

See also Adrain 2011, Dean 1983, Harrington and Leanza 1957 and Whittington et al. 1997

Sister taxa: Alsataspididae, Dionididae, Liostracinidae, Raphiophoridae

Subtaxa: Anebolithus Auritolithus Bergamia Bettonolithus Botrioides Costonia Cryptolithinae Cryptolithoides Cryptolithus Deanaspis Decordinaspis Eirelithus Famatinolithus Furcalithus Guandacolithus Gymnostomix Hanchungolithinae Hanchungolithus Incaia Jianxilithus Lloydolithus Lordshillia Marekolithus Marrolithinae Marrolithoides Marrolithus Microdiscus Myinda Myindella Myttonia Nankinolithus Ningkianolithus Novaspis Onnia Paratretaspis Paratrinucleus Parkesolithus Protolloydolithus Reedolithus Reuscholithus Salterolithus Stapeleyella Telaeomarrolithus Tretaspidinae Trinucleinae Trinucleus Whittardolithus Xiushuilithus Yinpanolithus

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Ecology: fast-moving low-level epifaunal suspension feeder

Distribution:

• Ordovician to Silurian of Canada (2: Québec collections)

• Ordovician of Argentina (15), Australia (11), Belgium (4), Bolivia (3), Canada (36: Northwest Territories, Ontario, Quebec, Québec, Yukon), China (42), the Czech Republic (26), France (9), Iran (6), Ireland (21), Italy (3), Kazakhstan (3), Lithuania (1), Morocco (11), New Zealand (1), Norway (77), Oman (1), Peru (2), Portugal (5), Spain (9), Sweden (26), Turkey (3), the United Kingdom (170), United States (166: Iowa, Kentucky, Maine, Maryland, Nevada, New York, Ohio, Oklahoma, Pennsylvania, Pennsylvania and Virginia, Virginia), Venezuela (1)

• Llandeilo of Sweden (2), the United Kingdom (5)

• Arenigian of China (23)

• Dawan of China (3)

• Arenig of Argentina (3), Bolivia (3), China (29), France (1), the United Kingdom (6)

• Cambrian of Canada (1: New Brunswick)

Total: 730 collections including 825 occurrences

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