Mesonacinae

The Mesonacinae comprise an extinct subfamily of trilobites that lived during the Botomian, found in North-America, Greenland and North-Western Scotland. The two genera in this subfamily are Mesonacis and Mesolenellus.^[1]

Mesonacinae Temporal range: 516–513 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ Botomian
Mesonacis vermontanus, late Lower Cambrian, Australia, Courtesy of Sam Gon III.
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Clade:	†Artiopoda
Class:	†Trilobita
Order:	†Redlichiida
Family:	†Olenellidae
Subfamily:	†Mesonacinae Walcott, 1890
Genera
Mesonacis Walcott, 1885[1] Mesolenellus (Palmer & Repina, 1993)[2][1]