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Trilobita - Redlichiida - Biceratopsidae

Synonymy list
YearName and author
1993Bristoliinae Palmer and Repina p. 23
1998Bristoliinae Lieberman p. 73
1998Bristoliinae Palmer p. 659
1999Bristoliinae Lieberman p. 115

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EubilateriaAx 1987
phylumArthropodaLatreille 1829
subphylumArtiopoda(Hou and Bergstrom)
classTrilobitaWalch 1771
orderRedlichiidaRichter 1932

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.

Subfm. †Bristoliinae Palmer and Repina 1993
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G. †Bristolia Harrington 1956
Bristolia anteros Palmer and Halley 1979
Bristolia bristolensis Resser 1928
Bristolia colberti Gapp and Lieberman 2014
Bristolia fragilis Palmer and Halley 1979
Bristolia harringtoni Lieberman 1999
Bristolia insolens Resser 1928
Bristolia mohavensis Hazzard and Crickmay 1933
G. †Fremontella Harrington 1956
Fremontella halli Walcott 1910
G. †Lochmanolenellus Lieberman 1998
Lochmanolenellus mexicana Lochman 1952
Wanneria mexicana prima Lochman 1952
A. R. Palmer and L. N. Repina 1993Olenellidae with glabella usually strongly constricted at SI or L2; transverse width of anterior part of Li usually distinctly narrower than occipital ring; glabellar furrows generally well developed. Preglabellar field shorter than border or absent. Posterior tips of ocular lobes oppo- site or anterior to Ll. Third thoracic segment with inner part of pleural region strongly expanded distally; pleural spine may be extended posterior to end of thorax. Opisthothorax well developed. Pygidium not known.
B. S. Lieberman 1999Bristoliinae is redefined as a

116 Peabody Museum Bulletin 45
monophyletic subfamily that includes only the genera Fremontella, Lochmanolenellus and Bristolia. This subfamily can be defined by the possession of the following diagnostic char- acters (thoracic characters only found in a few species of Bristolia, the only members of the subfamily for which thoracic remains exist): 1. anterior cephalic border developed as an el- evated ridge, and prominently separated from extraocular area by furrow; 2. anterolateral margins of frontal lobe not prominently separated from anterior extraocular area by furrow (not anterior border furrow); 3. prominent parafrontal band not visible in dorsal view; 4. anterolateral margins of frontal lobe at each side of midline deflected posteriorly at roughly 10 degree angle relative to transverse line; 5. S3 same depth laterally as medially; 6. an- terodistal margins of L3 formed by ocular lobes; 7. surface of interocular area slopes evenly from tip of ocular lobe to glabella; 8. genal spine angle developed opposite S0 or position anterior of S0; 9. posterior edge of ocular lobe developed anterior of or opposite medial part of distal margin of L1; 10. lateral lobes absent from L0; 11. distal sector of S0 transverse; 12. intergenal angle relative to transverse line directed anteriorly at least 35 degrees; 13. T3 macropleural, pleural spine of T3 projects further posteriorly than length of entire protho- rax; 14. anterior margin of thoracic pleural furrow on T3, when proceeding from proximal to distal edge, parallels a transverse line before flexing strongly posteriorly; 15. posterior margin of thoracic pleural furrow on T3 with medial part directed strongly posteriorly, dis- tal part parallel to a transverse line or weakly flexing anterolaterally; 16. thoracic pleural spines on segments 5 to 8 developed as short projections extending two thoracic segments back; 17. sharp boundary between thoracic pleural furrow and anterior band; 18. prominent spine present on 15th thoracic axial ring.
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: base of the Lenian to the top of the Dyeran or 516.00000 to 511.20000 Ma

Collections (46 total)

Time interval Ma Country or state Original ID and collection number
Cambrian538.8 - 485.4Canada (Northern Territories) Bristolia colberti (228650)
Atdabanian - Toyonian521.0 - 510.2Argentina Fremontella inopinata (73361)
Montezuman520.0 - 515.3Mexico Wanneria mexicana (10682)
Lenian516.0 - 510.2Argentina Fremontella inopinata (51754)
Dyeran515.3 - 511.2USA (California) Bristolia anteros (149629 149699 226626) Bristolia anteros, Bristolia fragilis (10613 151378 230439) Bristolia brachyomma (10630) Bristolia bristolensis (10609 149628 149647 149648 149693 149694 149698) Bristolia bristolensis, Bristolia anteros, Bristolia fragilis (149610) Bristolia bristolensis, Bristolia insolens (10610) Bristolia fragilis (149649) Bristolia mohavensis (10607) Bristolia n. sp. 2, Bristolia n. sp. 3 (10618) Bristolia sp. (226265 226271 230298) Bristolia sp.1, Bristolia bristolensis (10608) Bristolia sp.2 (10612 10615 10616) Bristolia sp.2, Bristolia anteros (10611) Bristolia sp.2, Bristolia sp.3, Bristolia sp.4, Bristolia sp.5 (10619) Bristolia sp.3 (10621) Mesonacis bristolensis, Paedeumias mohavensis (219694) Mesonacis insolens (219698) Mesonacis insolens, Bristolia bristolensis, Paedeumias mohavensis, Bristolia anteros, Bristolia harringtoni (219695) Olenellus bristolensis, Olenellus insolens, Paedeumias mohavensis (192036) Paedeumias mohavensis (219697 219699)
Dyeran515.3 - 511.2Mexico (Sonora) Bristolia bristolensis (90559)
Dyeran515.3 - 511.2USA (Nevada) Bristolia anteros (149558) Bristolia anteros, Bristolia fragilis (149555 149556) Bristolia bristolensis (149576) Bristolia fragilis (149551)
Dyeran515.3 - 511.2Canada (Newfoundland) Bristolia mohavensis (195924)