Nevadia weeksi Walcott, 1910
Name: Nevadia weeksi Walcott, 1910
Superfamily: "Nevadioidea" Hupé, 1953
Suborder: Olenellina Walcott, 1890
Order:
Redlichiida Richter, 1932
Locality: left: Esmeralda County, Nevada; right: Goldfield, Nevada
Stratigraphy: left: Montenegro Member of the Campito Formation, Lower Cambrian;
right: Poleta Fm., L. Cam.
Remarks: Photos: G. Ast.
Name: Nevadia weeksi Walcott, 1910
Superfamily: "Nevadioidea" Hupé, 1953
Suborder: Olenellina Walcott, 1890
Order: Redlichiida Richter, 1932
Locality:
Inyo-White Mountains, Eastern California
Stratigraphy: Lower Cambrian , Nevadia-Holmia Faunule, Nevadella Biozone, Campito or Poleta? Fm.
Remarks: Photos courtesy of the White Mountain Research Station, Bishop, Ca.
http://www.wmrs.edu/projects/trilobites/images/trilo4-2.jpg
http://www.wmrs.edu/projects/trilobites/images/trilo4-4.jpg
Discussion:
According to Lieberman (2001), the genus Nevadia Walcott, 1910 has 8 known species:
Nevadia weeksi Walcott, 1910 (type species)
Nevadia bacculenta (Fritz, 1972) [formerly Nevadella bacculenta Fritz, 1972]
Nevadia faceta (Fritz, 1972) [formerly Nevadella faceta Fritz, 1972]
Nevadia ovalis McMenamin, 1987
Nevadia fritzi Lieberman, 2001
Nevadia gracile (Walcott, 1910) [formerly Wanneria? gracile Walcott, 1910]
Nevadia sp. 1 (of Fritz, 1972) [formerly Nevadella sp. 1 Fritz, 1972]
Nevadia sp. 2 (of Fritz, 1972) [formerly Nevadella sp. 2 Fritz, 1972]
Nevadia differs from Nevadella in:
-the relative length (sag.) of LA (L4) is consistently greater in Nevadella than it is in Nevadia (glabella is shorter in Nevadia in general)
-S2 is convex anteriorly in Nevadella and straight in Nevadia
-the intergenal ridge medial of the eye is well developed in Nevadia, but is not visible in Nevadella
-the anterior margin of the medial part of the third thoracic pleural segment is directed anteriorly in Nevadella (in Nevadia it is transverse)
-the third sgment is macropleural in Nevadella, not in Nevadia
-characters of the axial rings and pleural furrows
N. weeksi differs from N. fritzi in that N. fritzi has slightly shorter ocular lobes and a posterior cephalic border which is flexed, rather than transverse (as is N. weeksi)
Reference: Lieberman, B. S. (2001) Phylogenetic analysis of the Olenellina Walcott, 1890 (Trilobita, Cambrian). Journal of Paleontology, Vol. 75, No. 1, pp. 96-115.
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