Trilobita - Ptychopariida - Shumardiidae
Parent taxon: Ptychopariida according to H. B. Whittington et al. 1997
See also Adrain 2011, Harrington and Leanza 1957 and Robison and Pantoja-Alor 1968
Sister taxa: Acrocephalitidae, Alokistocaridae, Amphorella, Atratebiinae, Bifodina, Bolaspididae, Bulnibarbi, Bvalbardites, Catillicephalidae, Chondrastaulina, Chuangiformis, Cliffiidae, Conococheaquea, Conocoryphidae, Conokephalinidae, Crepicephalidae, Diceratocephalidae, Elviniidae, Harpina, Indiligens, Kazelina, Kingstoniidae, Kirengelia, Lisaniidae, Lonchocephalidae, Lorenzellidae, Marjumiidae, Meniscocorphye, Meniscocoryphe, Menomoniidae, Neoanomocerella, Norwoodiidae, Olenina, Papyriaspididae, Phylacteridae, Plethopeltidae, Proasaphiscidae, Propeltura, Ptychopariidae, Ptychopariina, Ptychoparoides, Raymondinidae, Solenopleuracea, Solenopleuridae, Tricrepicephalidae, Xianquianaspis, Yuehsieszella
Subtaxa: Acanthopleurella Changchowilla Conophrys Koldinioidia Kweichowilla Leioshumardia Leoforteyia Liriamnica Shumardia Shumardoella Shumardops Tarimella
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Dobrotivian of the Czech Republic (1 collection)
• Whiterockian of Canada (5: Newfoundland and Labrador), Norway (2), United States (1: Nevada)
• Chazyan of Canada (2: Newfoundland and Labrador)
• Arenigian of Canada (1: Northwest Territories), China (6)
• Arenig of Argentina (1), Australia (1), Bolivia (1), Canada (2: Newfoundland and Labrador), China (3), Norway (3), the Russian Federation (1), Sweden (3), the United Kingdom (2)
• Ordovician of Argentina (14), Australia (6), Canada (2: Alberta, Northwest Territories), China (33), Iran (1), Ireland (1), Italy (3), Kazakhstan (2), Norway (11), the Russian Federation (1), Sweden (2), the United Kingdom (8), United States (12: California, Nevada, New York, Utah)
• Tremadoc of Argentina (20), Bolivia (5), China (16), France (2), Iran (5), Mexico (8), Norway (2), Spain (2), Sweden (2), the United Kingdom (1)
• Cressagian of the United Kingdom (3)
• Skullrockian of Argentina (1)
• Ibexian of United States (1: Nevada)
• Taoyuanian of China (2)
• Cambrian to Ordovician of Canada (1: Quebec)
• Cambrian of Argentina (7), Australia (15), China (14), Kazakhstan (4), South Korea (1), the United Kingdom (6), Vietnam (1)
Total: 250 collections including 264 occurrences