Pterobranchia - Graptoloidea - Isograptidae
Synonym: Arienigraptidae Yu and Fang 1981
Parent taxon: Glossograptina according to J. Maletz 2014
Sister taxa: Cyrtograptidae, Glossograptidae
Subtaxa: Cardiograptus Isograptus Parisograptus
Ecology: passively mobile planktonic suspension feeder
Distribution:
• Ordovician of Argentina (4 collections), Australia (1), Bolivia (1), Canada (3: Newfoundland and Labrador, Quebec, Yukon), China (6), New Zealand (33), the Russian Federation (11), United States (11: Alaska, British Columbia, Idaho, New York, Texas)
• Llandeilo of China (1)
• Whiterockian of Canada (1: Newfoundland and Labrador)
• Castlemainian of New Zealand (8), United States (4: Idaho)
• Ningkuo of China (5)
• Arenig of China (9), Morocco (1), Norway (2), United States (1: Nevada)
• Arenigian of Canada (2: Northwest Territories), United States (1: Alaska)
Total: 105 collections including 164 occurrences