Mesonacis

Mesonacis
Temporal range: 516–513 Ma
↓
Botomian
Mesonacis vermontanus, late lower Cambrian, Vermont, USA, courtesy of the Smithsonian Museum of Natural History.
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Trilobita
Order:
Redlichiida
Suborder:
Olenellina
Superfamily:
Olenelloidea
Family:
Olenellidae
Subfamily:
Mesonacinae
Genus:
Mesonacis

Walcott, 1885
Species
  • Mesonacis vermontanus
    (Hall, 1859) type species, synonyms Olenellus vermontanus, O. georgiensis[1]
  • Mesonacis bonnensis
    (Resser and Howell, 1938), synonyms Olenellus bonnensis, O. brevioculus, O. terranovicus[1]
  • Mesonacis cylindricus
    (Palmer, 1979), synonyms Olenellus cylindricus[1]
  • Mesonacis eagerensis
    (Best, 1952), synonym Olenellus eagerensis[1]
  • Mesonacis fremonti
    (Walcott, 1910), synonyms Olenellus fremonti, Fremontia fremonti[1]
  • Mesonacis hamoculus
    (Cowie & McNamara, 1978), synonym Olenellus hamoculus[1][2]

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).[3][4] Angustolenellus is now regarded a junior synonym of Mesonacis.[1]

  1. ^ a b c d e f g Lieberman, B.S. (1999). "Systematic Revision of the Olenelloidea (Trilobita, Cambrian)" (PDF). Bulletin of the Peabody Museum of Natural History. 45. Archived from the original (PDF) on 2019-05-09.
  2. ^ Cowie, J.; McNamara, K.J. (1978). "Olenellus (Trilobita) from the Lower Cambrian Strata of North-West Scotland" (PDF). Palaeontology. 21 (3): 615–634. Archived from the original (PDF) on 2012-05-26.
  3. ^ Cite error: The named reference Palmer&Repina was invoked but never defined (see the help page).
  4. ^ H. B. Whittington; et al. (1997). "Introduction, Order Agnostida, Order Redlichiida". Treatise on Invertebrate Paleontology. Part O, Revised. Trilobita.