Artiopoda - Olenida - Olenidae
Synonym: Triarthrinae Ulrich 1930
Parent taxon: Olenidae according to A. W. Owen 1981
See also Fortey 1974, Harrington and Leanza 1957, Ludvigsen 1982, Nikolaisen 1965 and Robison and Pantoja-Alor 1968
Sister taxa: Acerocare, Acerocarina, Aciculolenus, Angelina, Apoplanias, Asilluchus, Baikonuraspis, Balnibarbiinae, Bienvillia, Bondarevites, Chekiangaspis, Ctenopyge, Cyclognathina, Euonchonotina, Eurycare, Hancrania, Helieranella, Highgatella, Huangshiaspis, Hypermecaspidinae, Jujuyaspis, Leiobienvillia, Leptobenthos, Leptoplastinae, Leptoplastus, Magnomma, Nericiaspis, Olenus, Parabolina, Parabolinella, Parabolinina, Parabolinites, Paraolenus, Paraplicatolina, Peltocare, Peltura, Pelturina, Pelturinae, Plicatolininae, Prohedinella, Protopeltura, Remizites, Rhodonaspis, Saltaspis, Sphaerophthalmella, Talbotinella, Ullaspis, Westergaardia, Westergaardites, Wujiajiania
Subtaxa: Plesioparabolina Porterfieldia Rampartaspis Triarthrus
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Uhaku of Norway (1 collection), Sweden (2)
• Whiterockian of Canada (12: Newfoundland and Labrador), Norway (2)
• Chazyan of Canada (3: Newfoundland and Labrador, Northwest Territories)
• Arenig of Argentina (7), Bolivia (1), China (1), Norway (2), Sweden (1), the United Kingdom (3), United States (1: Nevada)
• Arenigian of Argentina (4)
• Ordovician of Argentina (24), Australia (3), Bolivia (3), Canada (23: Alberta, Northwest Territories, Nunavut, Ontario, Quebec, Québec), China (10), France (2), Ireland (1), Kazakhstan (3), New Zealand (1), Norway (3), Peru (1), the Russian Federation (1), Sweden (8), the United Kingdom (8), United States (48: Kentucky, Michigan, Nevada, New York, Ohio, Pennsylvania), Venezuela (1)
Total: 180 collections including 199 occurrences