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Xenostegium

Trilobita - Asaphida - Asaphidae

Taxonomy
Xenostegium was named by Walcott (1924) [Sepkoski's age data: O Trem-l O Trem-u Sepkoski's reference number: 795]. It is not extant.

It was assigned to Asaphidae by Jell and Adrain (2002); and to Ptychopariida by Sepkoski (2002).

Synonymy list
YearName and author
1924Xenostegium Walcott
2002Xenostegium Jell and Adrain p. 461
2002Xenostegium Sepkoski

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Ecdysozoa
—Panarthropoda
phylumArthropodaLatreille 1829
RankNameAuthor
subphylumArtiopoda(Hou and Bergstrom)
classTrilobitaWalch 1771
subclassLibristoma
orderAsaphidaSalter 1864
superfamilyAsaphoideaSalter 1864
familyAsaphidaeBurmeister 1843
genusXenostegiumWalcott 1924

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. †Xenostegium Walcott 1924
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†Xenostegium shepardi Raymond 1922
Diagnosis
No diagnoses are available
Measurements
No measurements are available
Composition: low Mg calcitec
Composition 2: chitinc
Entire body: yesf
Adult length: 10 to < 100f
Adult width: 10 to < 100f
Ontogeny: molting, addition of partsc
Environment: marinec
Locomotion: fast-movingo
Life habit: low-level epifaunalo
Diet: carnivorec
Vision: well-developedf
Created: 2009-06-11 14:38:06
Modified: 2009-12-14 00:45:08
Source: f = family, o = order, c = class
References: Aberhan et al. 2004, Hendy 2009, Hendy et al. 2009

Age range: Demingian or 485.40000 to 478.60000 Ma

Collections (21 total)


Time interval Ma Country or state Original ID and collection number
Skullrockian487.5 - 482.3USA (Utah) X. franklinense (104158 104163 104174 104180 104184) X. sp. (104164 104171 104175 105776)
Ibexian487.5 - 470.0USA (Nevada) X. franklinense (104562)
Tremadoc486.5 - 477.7USA (Montana) X. sp. (275)
Demingian485.4 - 478.6USA (Montana) X. sp. (284)
Gasconadian485.4 - 477.7USA (California) X. sp. (104643)
Gasconadian485.4 - 477.7USA (Utah) X. franklinense (103913)
Gasconadian485.4 - 477.7USA (Idaho) X. franklinense (103827)
Gasconadian485.4 - 477.7USA (Nevada) X. franklinense (104341) X. sp. (104337)
Gasconadian485.4 - 477.7USA (Montana) X. franklinense (210719 210720)
Canadian485.4 - 457.3Canada (Northwest Territories) X. sp. (25438)
Tulean480.8 - 474.9USA (Idaho) X. taurus (103803)