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Nevadia
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 Holmiidae by Fritz (1995); to Nevadiidae by Palmer and Repina (1993), Whittington et al. (1997), Lieberman (1998), Jell and Adrain (2002); to Nevadioidea by Lieberman (2001), Lieberman (2002); and to Olenellida by Sepkoski (2002).
It was assigned to Mesonacidae by Walcott (1910); to Holmiidae by Fritz (1995); to Nevadiidae by Palmer and Repina (1993), Whittington et al. (1997), Lieberman (1998), Jell and Adrain (2002); to Nevadioidea by Lieberman (2001), Lieberman (2002); and to Olenellida by Sepkoski (2002).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1910 | Nevadia Walcott p. 236 |
| 1993 | Nevadia Palmer and Repina p. 31 fig. 10.1 |
| 1995 | Nevadia Fritz p. 718 |
| 1997 | Nevadia Whittington et al. p. 426 |
| 1998 | Nevadia Lieberman p. 68 |
| 2001 | Nevadia Lieberman p. 105 |
| 2002 | Nevadia Jell and Adrain p. 411 |
| 2002 | Nevadia Lieberman p. 704 |
| 2002 | Nevadia Sepkoski |
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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.
G. †Nevadia Walcott 1910
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†Nevadia addyensis Okulitch 1951
†Nevadia fritzi Lieberman 2001
†Nevadia gracile Walcott 1910
†Nevadia ovalis McMenamin 1987
†Nevadia saupeae Gapp et al. 2011
†Nevadia weeksi Walcott 1908
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| 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 1993 | Nevadiidae 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. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class | |||||
| References: Hendy 2009, Aberhan et al. 2004, Hendy et al. 2009 | |||||
Age range: base of the Meishucunian to the top of the Dyeran or 530.70000 to 509.70000 Ma
Collections (34 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Cambrian | USA (California) | Nevadella gracile (226259) | |
| Early/Lower Cambrian | USA (Washington) | N. addyensis (191233) | |
| Waucoban | USA (Washington) | N. sp. (264) | |
| Waucoban | USA (Nevada) | N. weeksi (69468 69469) | |
| Cambrian | Canada (Northern Territories) | N. ovalis (228646) N. saupeae (228647 228649) | |
| Meishucunian - Tommotian | Mexico (Sonora) | N. ovalis (210979) | |
| Montezuman - Atdabanian | USA (Nevada) | N. parvoconica (10496) | |
| Montezuman - Atdabanian | Mexico | N. sp. (10681) | |
| Montezuman | USA (Nevada) | N. fritzi (196172) N. sp., N. weeksi (10555) N. weeksi (69466) N. weeksi, N. fritzi (196142) | |
| Montezuman | USA (California) | N. fritzi (196145 196183) N. sp. (196129) N. sp., N. weeksi (196185) N. weeksi (196141 196143 196170) N. weeksi, N. fritzi (204216) Wanneria gracile (203379) | |
| Lenian | Canada (British Columbia) | N. sp. (10857 10858) N. weeksi (10854 10855) | |
| Lenian | Canada (Alberta) | N. provoconica, N. sp. (10868) | |
| Dyeran | USA (California) | Wanneria gracile (226565 226617 226618 226622) | |
| Dyeran | USA (Nevada) | Wanneria gracile (203345) |