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Trilobita - Asaphida

Synonymy list
YearName and author
1864Asaphida Salter
1990Asaphida Fortey p. 560
1994Asaphida Hughes
2002Asaphida Sepkoski, Jr.
2011Asaphida Adrain p. 107

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EubilateriaAx 1987
phylumArthropodaLatreille 1829
classTrilobitaWalch 1771
orderAsaphidaSalter 1864
orderAsaphidaSalter 1864

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.

R. A. Fortey 1990Libristoma having ventral median suture. Only primitive forms retain natant hypostomal condition, the majority of the group being conterminant or impendent. Higher Asaphida also have a distinctive inflated protaspis - the asaphoid protaspis.
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
Comments: ECOSPACE CODE: 312 JA: originally entered as "detritivore" but "organic particle feeders on soft sediments" according to Fortey and Owens 1999; applies to "primitive members" onlyo
Created: 2009-10-11 08:22:09
Modified: 2012-08-27 07:22:20
Source: o = order, c = class
References: Aberhan et al. 2004, Hendy et al. 2009

Age range: base of the Botomian to the top of the Pridoli or 516.00000 to 419.20000 Ma

Collections (4841 total)

Oldest occurrences

Time interval Ma Country or state Original ID and collection number
Cambrian541.0 - 485.4USA (Wisconsin) Ptychaspis sp. (250)
Cambrian541.0 - 485.4USA (Montana) Macronoda sp., Promesus sp. (258)
Cambrian541.0 - 485.4Norway (Ringsaker) Proceratopyge nathorsti (194050)
Cambrian541.0 - 485.4USA (Alaska) Richardsonella sp. (114979) Tostonia sp. (114982)
Cambrian541.0 - 485.4USA (Utah) Euptychaspis sp., Eurekia sp., Bayfieldia sp., Idiomesus sp. (259)
Cambrian541.0 - 485.4USA (New York) Keithiella sp. (254)
Cambrian541.0 - 485.4China (Jilin Provence) Onychopyge depressa (156912) Platypeltoides hunjiangensis, Platypeltoides laevigata, Richardsonella lilia (156921) Platypeltoides hunjiangensis, Richardsonella lilia (156922) Platypeltoides laevigata, Platypeltoides hunjiangensis, Richardsonella lilia (156924) Richardsonella sp., Richardsonella lilia (156928) Yosimuraspis sp. (156929)
Botomian516.0 - 513.0Russian Federation (Tuva) Kolbinella prima (9978)
Taijangian513.0 - 505.0China (Guizhou) Fuquania gelaobaoensis, Fuquania conica (127442)
Taijangian513.0 - 505.0China (Shanxi) Haniwoides brevicus (125222)

Youngest occurrences

Time interval Ma Country or state PBDB collection number
Aeronian - Telychian440.8 - 433.4USA (Georgia) Isotelus brachycephalus (164677)
Sheinwoodian433.4 - 430.5United Kingdom (England) Raphiophorus parvulus (23091)
Wenlock433.4 - 427.4USA (Arkansas) Raphiophorus niagarensis (26020)
Homerian430.5 - 427.4Czech Republic Raphiophorus roualti (14028 14050 14103) Raphiophorus sp. (14102)
Gorstian427.4 - 425.6Algeria Raphiophorus rouaulti (27153)
Gorstian - Ludfordian427.4 - 423.0Czech Republic Raphiophorus roualti (14127)
Ludlow427.4 - 423.0Morocco Raphiophorus roualti (27029) Raphiophorus rouaulti (27053)
Ludlow427.4 - 423.0United Kingdom (England) Raphiophorus sp. (482)
Ludfordian425.6 - 423.0Austria Raphiophorus roualti (13908)
Pridoli423.0 - 419.2Italy (Sardinia) Ampyx ouralti (26173) Raphiophorus sp. (26187)