†subfamily Mesonacinae Walcott 1891 (trilobite)
Artiopoda - Redlichiida - Olenellidae
Alternative spelling: Mesonacidae
Parent taxon: Olenellidae according to B. S. Lieberman 1999
See also Riccio 1952 and Walcott 1910
Sister taxa: Arcuolenellus, Biceratops, Fritzolenellus, Gabriellinae, Gabriellus, Olenellinae, Peachella, Teresellus
Subtaxa: Mesolenellus Mesonacis
Ecology: fast-moving low-level epifaunal deposit feeder
Distribution:
• Cambrian of Canada (6: British Columbia, Newfoundland, Northern Territories, Nunavut collections), Greenland (3), Mexico (1), United States (31: California, Nevada, Vermont)
• Caerfai of United States (1: Nevada)
Total: 42 collections including 43 occurrences