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5 results for “Tiaracrinus”
Fig. 6 in A new species of Tiaracrinus from the latest Emsian of Morocco and its phylogeny
Fig. 6. Reconstruction of the phylogeny of the species of Tiaracrinus, based on their morphology and stratigraphic occurrences. Devonian timescale after Kaufmann (2006). All ranges of species lack precision and are thus indicated by open boxes.
Fig. 4 in A new species of Tiaracrinus from the latest Emsian of Morocco and its phylogeny
Fig. 4. PCA of some published (Le Menn 1190; Hauser 2008) and the two newly described specimens of Tiaracrinus (see Table 1). See Methods for definition of the parameters. A. Plot of principal components 1 and 2; note, how the new species separates well from the previously known ones. B. Plot of principal components 1 and 3. C. Plot of principal components 2 and 3; again, the new species is morphologically separated from the others. Open circles mark the values of the new species T. jeanlemenni sp. nov., solid squares mark all other species.
Fig. 2 in A new species of Tiaracrinus from the latest Emsian of Morocco and its phylogeny
Fig. 2. Zophocrinid crinoid Tiaracrinus jeanlemenni sp. nov., probably late Polygnathus patulus Conodont Biozone, late Anarcestes lateseptatus Ammonoid Biozone, latest Emsian, Early Devonian, eastern Anti-Atlas Morocco. A. PIMUZ 29739, holotype, "Red cliff" at Hamar Laghdad, Tafilalt. Lateral views (A1, A2), showing the radial channel and the rib-fields; note the ornamentation in the channel near the oral surface in A2. Aboral view (A3), note the small cross section of the trimeral basals and the low rim around it. Oral view (A4), note the ornamentation in the channel near the oral surface. Detail of A3 (A5), note the epispires and the uniform thickness of the ribs. On the top right, the subtle striation is faintly visible between the ribs. Oblique view of the aboral side (A6), showing the epispires. Due to weathering, the ribs obtained a tuberculate ornament (A7). B. PIMUZ 29741, paratype, Jebel Oufatene, Maïder. Aboral view (B1), the rib-fields are less vaulted and the cross section of the calyx less quadrate than in the holotype; the fossil on the top left is a spiriferid. Lateral views (B2, B3), showing the narrow ribs and the smooth surface of the radial channels; in the lateral aspect it looks like the radial channel is tapering towards the oral side of the cup.
Fig. 1 in A new species of Tiaracrinus from the latest Emsian of Morocco and its phylogeny
Fig. 1. Geological map (modified from Klug 2002) of the eastern Anti-Atlas showing the two localities that yielded Tiaracrinus.
Fig. 5 in A new species of Tiaracrinus from the latest Emsian of Morocco and its phylogeny
Fig. 5. Cluster analysis (Euclidean, paired group) of some published specimens and the two newly described specimens (see Table 1). The cluster on the right including Tiaracrinus quadrifrons and Tiaracrinus tetraedra is supported by the bootstrap (at 500 replicates; 59%with past); the Tiaracrinus oehlerti and Tiaracrinus moravicus-group (59 and 64%) and the Tiaracrinus jeanlemenni and Tiaracrinus rarus-group (62 and 72%) are also reasonably well supported. See also the methods chapter for definition of the parameters.
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