<img src=”https://naked-science.ru/wp-content/uploads/2025/02/tentaculioida.jpg” alt=”Paleontologists have described the anatomy of mysterious Devonian tentaculites”/>Tentaculites are problematic animal fossils that are especially numerous in Devonian rocks. The strange, elongated, bolt-like shells have been attributed to a variety of taxa, most often annelids or mollusks. However, a whole scattering of new finds from Armenia have pointed to the structure of the tentaculite body-retracting muscles. They suggest that the Paleozoic “screws” are related to bryozoans and other tentacled animals.