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I have found these small pacman-like segments at Jacksboro, TX (Lost Creek Reservoir), which is Pennsylvanian, and have always thought that they were a segment from a crinoid stem. I then found what looks like a stem with about 7-8 segments along with more of the individual segments. However, the segments never have any of the radial lines that I often seen in other crinoid segments. Any idea what these are? Thanks.