30425 - Rare 0.24 Inch Agnostus bidens Middle Cambrian Trilobite - Utah USA
30425 - Rare 0.24 Inch Agnostus bidens Middle Cambrian Trilobite - Utah USA 30425 - Rare 0.24 Inch Agnostus bidens Middle Cambrian Trilobite - Utah USA 30425 - Rare 0.24 Inch Agnostus bidens Middle Cambrian Trilobite - Utah USA

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30425 - Rare 0.24 Inch Agnostus bidens Middle Cambrian Trilobite - Utah USA

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Agnostus bidens
Middle Cambrian,(~509 Million Years)
House Range, Utah (USA)
Wheeler Shale Formation
6.1 mm   •    in
5 g   •    oz
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Agnostus, Brongniart 1822 (trilobite)
Trilobita - Agnostida - Agnostidae

PaleoDB taxon number: 19176

Parent taxon: Agnostidae according to H. B. Whittington et al. 1997

See also Henningsmoen 1958, Jell and Adrain 2002 and Sepkoski 2002

Sister taxa: Acmarhachis, Acutatagnostus, Agnostardis, Ammagnostus, Biciragnostus, Connagnostus, Eurudagnostus, Formosagnostus, Glyptagnostus, Gymnagnostus, Hadragnostus, Homagnostus, Idolagnostus, Innitagnostus, Ivshinagnostus, Kormagnostella, Kormagnostus, Leiagnostus, Lotagnostus, Micragnostus, Neoagnostus, Oncagnostus, Oxyagnostus, Peronopsinae, Phalagnostus, Proagnostus, Ptychagnostinae, Quadrahomagnostus, Strictagnostus, Trilobagnostus

Subtaxa: Agnostus (Agnostus), Agnostus (Homagnostus), Agnostus artilimbatus, Agnostus babcocki, Agnostus brighamensis, Agnostus captiosus, Agnostus desideratus, Agnostus neglectus, Agnostus tardus, Agnostus valentinus

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Ecology: slow-moving epifaunal detritivore

Environments: slope (11 collections), marine (7), carbonate (4), deep subtidal ramp (2), offshore shelf (2), (1), shallow subtidal (1), basinal (carbonate) (1), offshore (1)

Age range: 513.0 to 478.6 Ma


• Ordovician of the United Kingdom (1 collection), United States (1: Nevada)

• Ayusokkanian of Kazakhstan (3)

• Marjumian of Greenland (2)

• Cambrian of Argentina (1), Canada (5: Yukon), China (9), the Czech Republic (1), Greenland (3), Kazakhstan (8), the Russian Federation (5), Sweden (2), United States (9: Idaho, Nevada, Pennsylvania, South Dakota, Utah)

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