Mesonacis Walcott 1885 (trilobite)

Trilobita - Redlichiida - Olenellidae

Alternative spelling: Olenellus (Mesonacis)

Synonyms: Angustolenellus Palmer and Repina 1993, Elliptocephalus (Schmidtia) Moberg 1899, Fremontia Raw 1936, Olenellus (Fremontia) Raw 1936, Schmidtia Moberg 1899

Full reference: C. D. Walcott. 1885. New genus of Cambrian trilobites, Mesonacis. American Journal of Science 3(29):328-330

Parent taxon: Mesonacinae according to B. S. Lieberman 1999

See also Harrington 1956, Jell and Adrain 2002, Lochman 1952, Palmer and Halley 1979, Palmer and Repina 1993, Riccio 1952, Sepkoski 2002, Walcott 1890, Walcott 1891, Walcott 1910 and Walcott 1916

Sister taxon: Mesolenellus

Subtaxa: Fremontia canadensis Mesonacis bonnensis Mesonacis cylindricus Mesonacis eagerensis Mesonacis fremonti Mesonacis hamoculus Mesonacis vermontanus Mesonacis wileyi

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Type: Olenus vermontana

Ecology: fast-moving low-level epifaunal deposit feeder


• Delamaran of United States (1: California collection)

• Caerfai of United States (1: Nevada)

• Cambrian of Canada (5: Newfoundland, Northern Territories, Nunavut), Mexico (1), United States (30: California, Nevada, Vermont)

Total: 38 collections including 39 occurrences

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