Mesonacis

Mesonacis
Temporal range: Botomian
Mesonacis vermontanus, late lower Cambrian, Vermont, USA, courtesy of the Smithsonian Museum of Natural History.
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: †Trilobita
Order: †Redlichiida
Family: †Olenellidae
Subfamily: †Mesonacinae
Genus: †Mesonacis
Walcott, 1885
Species
  • Mesonacis vermontanus
    (Hall, 1859) type species, synonyms Olenellus vermontanus, O. georgiensis
  • Mesonacis bonnensis
    (Resser and Howell, 1938), synonyms Olenellus bonnensis, O. brevioculus, O. terranovicus
  • Mesonacis cylindricus
    (Palmer, 1979), synonyms Olenellus cylindricus
  • Mesonacis eagerensis
    (Best, 1952), synonym Olenellus eagerensis
  • Mesonacis fremonti
    (Walcott, 1910), synonyms Olenellus fremonti, Fremontia fremonti
  • Mesonacis hamoculus
    (Cowie & McNamara, 1978), synonym Olenellus hamoculus

Mesonacis is an extinct genus of trilobite that lived during the Botomian, found in North-America (excluding Greenland), and the United Kingdom (North-Western Scotland). Some of the species now regarded part of Mesonacis, have previously been assigned to Angustolenellus or Olenellus (Angustolenellus). Angustolenellus is now regarded a junior synonym of Mesonacis.

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