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Cirquella nelsoni

Artiopoda - Redlichiida

Taxonomy
Cirquella nelsoni was named by Lieberman (2001). Its type specimen is LACMIP 7372, a cephalon/head, and it is a 3D body fossil. Its type locality is UCLA loc. 6789, which is in a Montezuman marine horizon in the Campito Formation of California.

Synonymy list
YearName and author
2001Cirquella nelsoni Lieberman p. 108 figs. Figure 6.1, 6.3

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—EcdysozoaAguinaldo et al. 1997
—Panarthropoda
phylumArthropodaGravenhorst 1843
RankNameAuthor
classArtiopodaHou and Bergstrom
classTrilobitaWalch 1771
orderRedlichiidaRichter 1932
suborderOlenellina
superfamilyNevadioidea
genusCirquellaFri 1993
speciesnelsoni

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.

†Cirquella nelsoni Lieberman 2001
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Diagnosis
ReferenceDiagnosis
B. S. Lieberman 2001Anterior cephalic border developed as narrow rounded ridge, prominently separated from extraocular area by furrow; plectrum present; LA (L4) with length (sag.) roughly equal to length (sag.) of L0 and L1; ocular lobes gradually in- crease dorsoventral elevation between axial furrows and mid- point of ocular lobes, contact anterior and posterior parts of LA; width (tr.) of interocular area approximately equal to width of ocular lobe; anterior of eyes extraocular area greatly reduced (exsag.); anterodistal margins of L3 formed by axial furrows; S2 not conjoined medially; glabellar furrows weakly incised; width (tr.) extraocular region opposite L1 equal to roughly 35 percent width of glabella at L1; genal spine angle developed opposite medial part of distal margin of L0; intergenal angle developed posterior of lateral margins of ocular lobes.
Measurements
No measurements are available
Composition: low Mg calcitec
Composition 2: chitinc
Ontogeny: molting, addition of partsc
Environment: marinec
Locomotion: fast-movingo
Life habit: low-level epifaunalo
Diet: deposit feedero
Created: 2009-09-21 20:18:56
Modified: 2012-08-27 07:43:00
Source: o = order, c = class
References: Hendy et al. 2009, Aberhan et al. 2004

Age range: Montezuman or 520.00000 to 515.30000 Ma

Collections (3 total)


Time interval Ma Country or state Original ID and collection number
Montezuman520.0 - 515.3USA (California) Cirquella nelsoni (type locality: 196129 196145 196185)