Trilobite Guts and Evolution 10-14-2017 by Paul Giem
Channel: ItIsAboutGod
Date: 2017-10-15

It is uncommon to find trilobite inner organs preserved, but the few specimens that have been preserved seemed to have lateral outpouchings early on and crops (large bulges in the gut at the front) later on. This led to the idea that crops evolved later. Now, an early adult specimen shows both crops and outpouchings, making it difficult to create an evolutionary pathway.

1. Hopkins, M. J., F. Chen, S. Hu, & Z. Zhang. 2017. The oldest known digestive system consisting of both paired digestive glands and a crop from exceptionally preserved trilobites of the Guanshan Biota (Early Cambrian, China). PLOS ONE https://doi.org/10.1371/journal.pone.0184982 - At http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0184982
2. https://www.sciencedaily.com/releases/2017/09/170921141201.htm
3. https://www.livescience.com/60507-trilobite-tummies-revealed-in-new-fossils.html

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