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File:Goniagnostus nathorsti fossil trilobites (Alum Shale Formation, upper Middle Cambrian; Kreklinger, Konigsburg, Norway) (15250614496).jpg

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Goniagnostus nathorsti (Brogger, 1878) fossil agnostoid trilobites in black shale from the Cambrian of Norway (FMNH P 25, Field Museum of Natural History, Chicago, Illinois, USA) (centimeter scale).

Agnostoids differ from "ordinary" trilobites (= polymeroids) by having the following characeristics: two-segmented thorax; blind (no eyes); isopygous (the heads & tails are equal-sized). Agnostoids are usually quite small.

Many modern arthropod phylogenetic studies conclude that agnostoids should be excluded from the trilobites.

Classification: Animalia, Arthropoda, Trilobita, Agnostida, Ptychagnostidae

Stratigraphy: Alum Shale Formation, Lejopyge laevigata Interval-zone, upper Middle Cambrian

Locality: Kreklinger, Konigsburg, Norway
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Source Goniagnostus nathorsti fossil trilobites (Alum Shale Formation, upper Middle Cambrian; Kreklinger, Konigsburg, Norway)
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15250614496. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

6 May 2015

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current18:56, 6 May 2015Thumbnail for version as of 18:56, 6 May 20151,908 × 1,334 (1.48 MB)Natuur12 (talk | contribs)Transferred from Flickr via Flickr2Commons

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