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7 results for “Olenidae”
FIGURE 6 in Phylogenetic analysis and revision of the trilobite subfamily Balnibarbiinae (Olenidae)
FIGURE 6. Cloacaspis tesselata Fortey and Droser, 1999, specimens from Ike's Canyon, Nevada. A. External mold of cranidium, USNM 720100. From USGS-D2219. B. Latex mold of cranidium, AMNH-FI-115823, cast from USNM 720100 (see A). C. Cranidium, AMNH-FI-115825. Found in Columbia University collections. D. Cranidium, AMNH-FI-115824. Found in Columbia University collections. E. Cranidium and thorax, USNM 720101. From USGS D2282-CO. Scale bar = 1 mm.
FIGURE 4. Cloacaspis spp. A. Cloacaspis ekphymosa Fortey, 1974, USNM 144232 in Phylogenetic analysis and revision of the trilobite subfamily Balnibarbiinae (Olenidae)
FIGURE 4. Cloacaspis spp. A. Cloacaspis ekphymosa Fortey, 1974, USNM 144232. Collected from the Lost River Area on Seward Peninsula, Alaska, and previously identified as Triarthrus sp. (Ross, 1965). Arrow pointing to postpalpebral furrow. B. Anterior border of Cloacaspis ceryx anataphra (Fortey, 1974), AMNH- FI-101655. Black arrows pointing to faint anterior border pits on internal mold. C. Cloacaspis ceryx anataphra (Fortey, 1974), AMNH-FI-101655. Collected from PO-18 of the Olenidsletta Member of the Valhallfonna Formation (Kröger et al., 2017). D) Cloacaspis ceryx ceryx (Fortey, 1974), AMNH-FI-101657. Close-up of E, anterior glabellar lobe and F, posterior wing, showing presence of fine granulation of recently prepared surface (white arrow) and lack of granulation on exposed and slightly eroded surface (black arrow). Collected from bed PO-18 of the Olenidsletta Member of the Valhallfonna Formation (Kröger et al., 2017). Scale bars = 1 mm except A and D, where scale bar = 5 mm.
FIGURE 3 in Phylogenetic analysis and revision of the trilobite subfamily Balnibarbiinae (Olenidae)
FIGURE 3. Size of preglabellar field relative to glabella in subspecies of Balnibarbi erugata and Cloacaspis ceryx. Arrow points to PMO-NF-227.730. Differences in relative length of preglabellar field are not correlated with overall size of the cranidium, and are thus not due to allometry. However, while subspecies of Balnibarbi erugata overlap in cranidial length, all measured specimens of C. ceryx anataphra are smaller than those of C. ceryx ceryx. Since these subspecies also differ in expression of surface granulation, it is possible that expression of granulation is related to size.
FIGURE 5 in Phylogenetic analysis and revision of the trilobite subfamily Balnibarbiinae (Olenidae)
FIGURE 5. Cloacaspis tesselata Fortey and Droser, 1999, specimens from Little Rawhide Mountain, Nevada. A. Librigena, AMNH-FI-115819. Specimen oriented relative to cranidium shown in B. B. Cranidium, AMNH- FI-115818. C. Librigena, AMNH-FI-115820. D. Paratype librigena, USNM 495690. Close-ups of B: E, posterior wing showing anastomizing lines along dorsal suture and glabella (white arrows) and curvature of distal part of posterior furrow (black arrow); and F, glabellar lobe L1, showing anastomizing lines and very fine granulation. G. Cranidium, AMNH-FI-115807. H. Cranidium, AMNH-FI-115808. All specimens except paratype collected by author in 2015. Scale bar = 1 mm.
FIGURE 7 in Phylogenetic analysis and revision of the trilobite subfamily Balnibarbiinae (Olenidae)
FIGURE 7. Cloacaspis tesselata? Fortey and Droser, 1999, specimens from Ike's Canyon, Nevada. A. Dorsal view of fused librigena, USNM 720102 (part). From USGS-D2217. B. Ventral view of fused librigena, USNM 720102 (counterpart). C. Close-up of anterior part of librigena USNM 720102 (counterpart), showing fusion and triangular projection. D. Close-up of advanced genal spine on librigena USNM 720102 (part). E. Pygidium, USNM 720103. From USGS D2217. F. Lateral view of pygidium, USNM 720103. Scale bar = 1 mm, except for A and B, where scale bar = 5 mm.
FIGURE 2. Balnibarbi erugata Fortey, 1974 in Phylogenetic analysis and revision of the trilobite subfamily Balnibarbiinae (Olenidae)
FIGURE 2. Balnibarbi erugata Fortey, 1974, close-ups. A. Balnibarbi erugata erugata, holotype cranidium, PMO-NF-3016. Note exfoliation of frontal area and glabella. Arrow points to terrace lines on anterior border that are expressed on both the external surface and internal mold. B. Anterior border of Balnibarbi erugata erugata, CAMSM F3976, showing faint caeca and very fine granulation on frontal area near anterior border furrow and terrace lines on border. C. Posterior border furrow on Balnibarbi erugata erugata, CAMSM F3976, showing very fine granulation. D. Occipital ring of Balnibarbi erugata erugata, PMO-NF-695, showing very fine granulation on glabella. E. Balnibarbi erugata erugata PMO-NF-772. Arrows point to select pits in anterior border furrow; specimen is exfoliated. F. Balnibarbi erugata sombrero, PMO-NF-2054. Arrows point to select pits in anterior border furrow on exfoliated surface. Scale bars = 1 mm.
Data from: Comparing phylogenetics and linear morphometrics to solve the generic assignment of Parabolinella? triarthroides Harrington (Trilobita, Olenidae)
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