Abstract
The taxonomic affinities of fossils from the Frasnian succession of Belgium previously described as phyllopod and phyllocarid crustacean shields are discussed. The rediscovery of the holotype of Ellipsocaris dewalquei, the type species of the genus Ellipsocaris Woodward in Dewalque, 1882, allows to end the discussion on the taxonomic assignation of the genus Ellipsocaris. It is removed from the phyllopod crustaceans as interpreted originally and considered here as an ammonoid anaptychus. Furthermore, it is considered to be a junior synonym of the genus Sidetes Giebel, 1847. Similarly, Van Straelen’s (1933) lower to middle Frasnian record Spathiocaris chagrinensis Ruedemann, 1916, is also an ammonoid anaptychus. Although ammonoids can be relatively frequent in some Frasnian horizons of Belgium, anaptychi remain particularly scarce and the attribution to the present material to peculiar ammonoid species is not possible.
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Acknowledgements
We are very grateful to Gerard Ciavatti (http://www.evolution-biologique.org) for supplying us his beautiful reconstruction drawing of Ceratiocaris. We are grateful to RBINS photographer Wilfried Miseur for producing high-resolution photographs of the specimen. We also thank Eric Dermience (RBINS) for granting us access to the RBINS Paleozoic Invertebrates collection. S.G. and B.M. benefit from a BELSPO financial support, and J.D. is supported by the FNRS. Rodney Feldmann, Sven Tathje, and three anonymous reviewers are thanked for their helpful suggestions.
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Goolaerts, S., Denayer, J. & Mottequin, B. Late Devonian (Frasnian) phyllopod and phyllocarid crustacean shields from Belgium reinterpreted as ammonoid anaptychi. Sci Nat 104, 98 (2017). https://doi.org/10.1007/s00114-017-1522-0
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DOI: https://doi.org/10.1007/s00114-017-1522-0