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Nevadia

Trilobita - Redlichiida - Nevadiidae

Taxonomy
Nevadia was named by Walcott (1910) [Sepkoski's age data: Cm Atda-u Sepkoski's reference number: 885]. Its type is Holmia weeksi.

It was assigned to Mesonacidae by Walcott (1910); to Nevadiidae by Palmer and Repina (1993) and Whittington et al. (1997); and to Olenellida by Sepkoski (2002).

Species lacking formal opinion data

View classification of included taxa

Synonymy list
YearName and author
1910Nevadia Walcott p. 236
1993Nevadia Palmer and Repina p. 31 fig. 10.1
1997Nevadia Whittington et al. p. 426
2002Nevadia Sepkoski, Jr.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
RankNameAuthor
phylumArthropodaLatreille 1829
subphylumMandibulata
classTrilobitaWalch 1771
orderRedlichiidaRichter 1932
familyNevadiidaeHupé 1953
genusNevadia

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
C. D. Walcott 1910
Dorsal shield broad, ovate. Cephalon large, semicircular in out-
line, about one-third the length of the dorsal shield genal angles ;
extended into spines ; facial sutures rudimentary or in a condition of symphysis ; eyes crescentic, with ridges uniting them with the anterior lobe oi the glabella ; glabella elongate, with a relatively small anterior lobe and three posterior transverse lobes ; strong occipital ring.
Thorax with twent}'-eight segments ; body of pleurcie nearly straight ; pleural furrow broad and parallel to the transverse axis of the jilcune ; pleura; terminating in long, curved spines that are much shorter on the posterior eleven segments in the type species which are without a distinct, furrowed pleural lobe.
Pygidium small, without pleural lobes and transverse furrows.
Surface minutely granular and with irregular network of fine, irregular, anastomosing ridges.
A. R. Palmer and L. N. Repina 1993Nevadiidae with width of interocular area less than one-fourth width of extraoctihu- area. Preglabellar- field present. Thorax of 27 segments. Pleural spines long. Transverse length of pleurae at least twice width of axis. Transition to opistluoliorax between segments 15 and 18. Pygidium small, subquadrate.