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6 June 2012 A New Species of Tiaracrinus from the Latest Emsian of Morocco and Its Phylogeny
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We describe a new species of the unusual crinoid Tiaracrinus, T. jeanlemenni sp. nov. from the latest Emsian of the famous mudmound locality Hamar Laghdad, Morocco. It differs from the previously known species in the higher number of ribs and the vaulted rib-fields, which is corroborated by the comparison of simple quantitative characters and ratios as well as by the results of a cluster analysis and a Principal Component Analysis. Based on the new material and the published specimens, we discuss the phylogeny of the genus and suggest that T. oehlerti and T. moravicus represent the ancestral forms of this small clade.

© 2014 C. Klug et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Christian Klug, Kenneth De Baets, Carole June Naglik, and Johnny Waters "A New Species of Tiaracrinus from the Latest Emsian of Morocco and Its Phylogeny," Acta Palaeontologica Polonica 59(1), 135-145, (6 June 2012).
Received: 30 November 2011; Accepted: 4 June 2012; Published: 6 June 2012

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