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Beautiful Triarthrus eatoni trilobite fossil from New York.

Triarthrus Trilobite Facts and Information - The Details

Triarthrus trilobites, of the Ptychopariida Order, are known from the Upper Ordovician rock in North America and Northern Europe.

These trilobites are narrow with a long thorax, have a small pygidium, and a plain looking cephalon. One notable feature on the cephalon is the presence of a series of glabellar furrows (It has a wide glabella with notable parallel ridges running across it). The eyes are slender, and often difficult to see in specimens, unless they are well preserved.

Based on the strata they are found in, they appear to have lived on the deep sea floor near the exareobic zone, a zone that is below the oxygen level required by most organisms. Elrathia of the Cambrian also lived in this type of environment.

Triarthrus trilobites would have been an often overlooked, indistinct trilobite if it wasn't for its preference toward exareobic environments. These environments of little oxygen tend to favor fossilization. In one of these places in the Frankfort Formation, called Beecher's Trilobite Bed, Pyrite has delicately preserved Triarthus to the point of soft tissue preservation. In the Beecher's Trilobite Bed, which is only a few centimeters thick, come some of the finest preserved fossil trilobites in the world.

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Trilobites from Fossil Era
Trilobite fossils are some of the most beautiful and collectible fossils in the world! There are countless species of trilobites. They make beautiful display and conversation pieces. Common ones make very affordable for gifts to fossil and paleontology enthusiasts. Fossil Era has a huge selection of top quality trilobites from many states and many countries. It's fun just to browse through the inventory and look at all the different types!

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Triarthrus Fossil Examples

The Ordovician rocks of New York are one of the easiest places to find Triarthrus trilobites.

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