Thursday, May 14, 2020

Greenops sp. trilobites from the Moscow formation

Greenops sp. is a commonly found trilobite at Deep Springs Rd. and I have a number of specimens. I have left the ID at the generic level as I need to study the features that differentiate the species from one another a little more.

For example, here is a partial specimen that I found but the eyes are missing, the pygidium is tucked under the thorax, and the genal spines are missing or hidden. All of these features are needed to narrow the species down from a list of three or four.

One of the ways you can ID the species of a Greenops is by the configuration of the spines (also called pleural lappets) that extend from the pygidium. As pygidium are very common, one might be able to find a couple of species without having the full body fossil. In the case of the three specimens below, I believe all are Greenops boothi as they all have "short, rounded pleural lappets" (Wilson, 2014).

Specimen #1

Specimen #2

Specimen #3

* Wilson, Karl. (2014). Field Guide to the Devonian Fossils of New York. pg 204

These specimens were found at a borrow pit on Deep Springs Road in Madison County, NY which exposes the Windom shale member of the Moscow formation (middle Devonian in age, Givetian stage.)  

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