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Bristolia

Trilobita - Redlichiida - Olenellidae

Taxonomy
Bristolia was named by Harrington (1956) [Sepkoski's age data: Cm Tojo].

It was assigned to Olenellinae by Harrington (1956); to Olenellida by Sepkoski (2002); and to Olenellidae by Whittington et al. (1997) and Jell and Adrain (2003).

Species lacking formal opinion data

View classification of included taxa

Synonymy list
YearName and author
1956Bristolia Harrington p. 58
1997Bristolia Whittington et al. p. 409
2002Bristolia Sepkoski, Jr.
2003Bristolia Jell and Adrain p. 352

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
RankNameAuthor
phylumArthropodaLatreille 1829
subphylumMandibulata
classTrilobitaWalch 1771
orderRedlichiidaRichter 1932
familyOlenellidae
genusBristolia

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
H. J. Harrington 1956Olenellinae with well advanced genal spines. Metagenal spines absent in adult. Metagenal angle narrowly obtuse to acute. Glabella with three pairs of lateral glabellar lobes, strongly constricted at the level of the preoccipital furrow. Second (3p) furrow transglabellar, gently curved backward, not reaching the axial furrows. Preoccipital (2p) furrow curved, chevron shaped, disconnected at middle. Frontal glabellar lobe pyriform, expanded in front and encroaching over anterior border of cephalon. Occipital ring broad (sag.) and as wide (tr.) as frontal glabellar lobe. Eye lobes short, submedian (slightly anterior), reaching level of preoccipital furrow. Cephalic border raised, narrowing anteriorly.