Mesonacis information

Mesonacis; Temporal range: 516–513 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ 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; 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).^[3]^[4] Angustolenellus is now regarded a junior synonym of Mesonacis.^[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.
^ 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.
^ Cite error: The named reference Palmer&Repina was invoked but never defined (see the help page).
^ H. B. Whittington; et al. (1997). "Introduction, Order Agnostida, Order Redlichiida". Treatise on Invertebrate Paleontology. Part O, Revised. Trilobita.

[Lieberman_1999-1] ^ ^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.

[Cowie&McNamara-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.

[Palmer&Repina-3] Cite error: The named reference Palmer&Repina was invoked but never defined (see the help page).

[Whittington-4] H. B. Whittington; et al. (1997). "Introduction, Order Agnostida, Order Redlichiida". Treatise on Invertebrate Paleontology. Part O, Revised. Trilobita.

Mesonacis information

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Mesonacis Temporal range: 516–513 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ 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]