This sea lily was collected from Upper Ordovician (Katian) rocks in Ontario, Canada. It was found in the Bobcaygeon Formation, which has many well-preserved crinoids, for which it is somewhat famous (Cole et al., 2018). Glyptocrinus ramulosus is one of the largest species among the crinoids found at this fossil locality (Cole et al., 2020), growing to about 40 cm (16 inches) in length. Its arms formed a large and dense fan to filter suspended particles from the water (Cole et al., 2019). It was attached to the substrate by a structure called a holdfast. This camerate crinoid is classified in the order Monobathrida.

References:

Cole, S.R., Ausich, W.I., Wright, D.F. and Koniecki, J.M., 2018. An echinoderm Lagerstätte from the Upper Ordovician (Katian), Ontario: taxonomic re-evaluation and description of new dicyclic camerate crinoids. Journal of Paleontology, 92(3), pp. 488-505. DOI: https://doi.org/10.1017/jpa.2017.151.

Cole, S.R., Wright, D.F. and Ausich, W.I., 2019. Phylogenetic community paleoecology of one of the earliest complex crinoid faunas (Brechin Lagerstätte, Ordovician). Palaeogeography, Palaeoclimatology, Palaeoecology, 521, pp. 82-98. DOI: https://doi.org/10.1016/j.palaeo.2019.02.006.

Cole, S.R., Wright, D.F., Ausich, W.I. and Koniecki, J.M., 2020. Paleocommunity composition, relative abundance, and new camerate crinoids from the Brechin Lagerstätte (Upper Ordovician). Journal of Paleontology, 94(6), pp. 1103-1123. DOI: https://doi.org/10.1017/jpa.2020.32.