Basic info Taxonomic history Classification Relationships
Morphology Ecology and taphonomy External Literature Search Age range and collections


Trilobita - Agnostida

Synonymy list
YearName and author
1864Agnostida Salter
1957Agnostida Harrington and Leanza
1968Agnostida Robison and Pantoja-Alor p. 775
1972Agnostida Palmer and Gatehouse p. 9
1992Agnostida Bengtson p. 1022
1997Agnostida Whittington et al. p. 331
2002Agnostida Sepkoski, Jr.
2008Agnostida Landing et al. p. 892

Is something missing? Join the Paleobiology Database and enter the data

EubilateriaAx 1987
phylumArthropodaLatreille 1829
classTrilobitaWalch 1771
orderAgnostidaSalter 1864
orderAgnostidaSalter 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.

No diagnoses are available
No measurements are available
Composition: low Mg calcitec
Composition 2: chitinc
Ontogeny: molting, addition of partsc
Environment: marinec
Locomotion: slow-movingo
Life habit: epifaunalo
Diet: detritivoreo
Comments: ECOSPACE CODE: 121.o
Created: 2004-02-29 09:55:43
Modified: 2018-11-10 16:55:31
Source: o = order, c = class
References: Kiessling 2004, Aberhan et al. 2004

Age range: base of the Tommotian to the top of the Ludlow or 530.00000 to 423.00000 Ma

Collections (2278 total)

Oldest occurrences

Time interval Ma Country or state Original ID and collection number
Early/Lower Cambrian541.0 - 513.0Canada (Northwest Territories) Pagetides sp., Pagetides spinulus (156156) Pagetides spinulus (156132 156143 156145 156147 156159) Pagetides spinulus, Yukonides lacrinus (156150 156157 156158) Yukonides lacrinus (156152)
Early/Lower Cambrian541.0 - 513.0Norway (Ringsaker) Runcinodiscus index (191020)
Early/Lower Cambrian - Middle Cambrian541.0 - 501.0USA (Nevada) Pagetia sp. (149389)
Cambrian541.0 - 485.4USA (Wisconsin) Litagnostus sp., Pseudagnostus sp. (250) Proagnostus sp., Armonia sp. (230)
Cambrian541.0 - 485.4Norway (Eiker-Sandsvær) Agnostus obesus (194058) Agnostus pisiformis (194040)
Cambrian541.0 - 485.4Norway Agnostus obesus (194054 194057) Agnostus pisiformis (194038)
Cambrian541.0 - 485.4Canada (British Columbia) Pagetia sp. (186)
Cambrian541.0 - 485.4Norway (Eiker) Agnostus pisiformis (194039 194041) Agnostus rudis (194091)
Cambrian541.0 - 485.4USA (Georgia) Solenopleurella buttsi, Armonia elongata (164675)
Cambrian541.0 - 485.4Norway (Brevik-Skien) Agnostus pisiformis (194036)

Youngest occurrences

Time interval Ma Country or state PBDB collection number
Pusgillian449.5 - 445.6China (ZheJiang) Geragnostus sp. (7808)
Pusgillian449.5 - 445.6China (Guizhou) Trinodus sp. (4750 7382)
Pusgillian449.5 - 445.6Sweden Sphaeragnostus sp., Trinodus sp. (2773)
Pusgillian449.5 - 445.6China (Hubei) Geragnostus sp. (4689)
Ashgill449.5 - 443.7China (ZheJiang) Corrugatagnostus sp. (7767)
Ashgill449.5 - 443.7USA (Maine) Corrugatagnostus sp., Geragnostus sp., Sphaeragnostus sp., Trinodus tardus (185954)
Ashgillian449.5 - 443.7China (Hubei) Trinodus sinensis (114989)
Hirnantian445.2 - 443.4Poland Arthrorhachis sp. (2760)
Aeronian440.8 - 438.5United Kingdom (England) Dawsonia sp. (453)
Wenlock - Ludlow433.4 - 423.0Canada (Northwest Territories) Solenopleura sp. (188855)