Tulites

Tulites are a group of extinct marine organisms that lived during the Ordovician period, approximately 485 to 444 million years ago. They are characterized by their distinctive, segmented bodies and are considered to be among the earliest known arthropods. Tulites are typically found as fossils in marine sediments, often preserved in three dimensions, which allows for detailed study of their anatomy.

The name "Tulites" comes from the Greek word "tulos," meaning "turban" or "hood," referring to the distinctive hood-like structure on the head of some species. This hood is believed to have been used for sensory or defensive purposes. Tulites exhibit a range of body sizes, from a few millimeters to over a centimeter in length, and their bodies are segmented into a series of rings or segments.

The fossil record of tulites is extensive, with numerous species described from various locations around the world. They are often found in association with other early arthropods, such as trilobites and other small, segmented animals. Tulites are significant in the study of evolutionary biology because they represent one of the earliest known examples of arthropods, providing valuable insights into the origins and early evolution of these diverse and successful animal groups.