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Tully Monster

Tullimonstrum, colloquially known as the Tully Monster, is an extinct genus of soft-bodied bilaterian that lived in shallow tropical coastal waters of muddy estuaries during the Pennsylvanian geological period, about 300 million years ago.”

Taxonomists cannot yet agree on where it belongs in the animal taxonomy, or even as to whether it's a vertebrate or not. See: Wikipedia

Its fossils are an example of a large group of as yet unidentified remains collectively known as 'probematica' or Incertae sedis (Latin for “of uncertain placement”).

References:

McCoy, V., Saupe, E., Lamsdell, J., Tarhan, L., McMahon, S., Lidgard, S., Mayer, P., Whalen, C., Soriano, C., Finney, L., Vogt, S., Clark, E., Anderson, R., Petermann, H., Locatelli, E., Briggs, D. 2016. The ‘Tully Monster’ is a vertebrate. Nature. doi: 10.1038/nature16992

Sallan, L., Giles, S., Sansom, R., Clarke, J., Johanson, Z., Sansom, I., Janvier, P. 2017. The ‘Tully Monster’ is not a vertebrate: characters, convergence and taphonomy in Palaeozoic problematic animals. Palaeontology. doi: 10.1111/pala.12282

Also see: Number of species


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