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3 results for “Eotebenna”
Fig. 3. Helcionelloid mollusc Eotebenna viviannae Peel, 1991a in Muscle attachment scars in helcionelloids from Denmark cast light on mollusc evolution in the Cambrian
Fig. 3. Helcionelloid mollusc Eotebenna viviannae Peel, 1991a, internal moulds, Andrarum Limestone, Bornholm, Denmark, Guzhangian, Miaolingian, middle Cambrian. A. MGUH 19565, paratype, lateral view (A1) with detail of apex (A2). B. MGUH 34273, lateral (B1) and apico-lateral views showing impression of comarginal ornamentation and cylindrical form of median sub-apical area (B2). C. Specimen lost, lateral view (C1) with detail of apex (C2), arrow locates detail of shell structure (C3). D. MGUH 34274, lateral view with detail of radial fibrous structure and overlying imbricated lamellae (D2), and patch of ornamented outer shell (D1, arrow). E. MGUH 34275, lateral view with detail of apex (E2) with muscle scars; arrows locate possible muscle scar. F. MGUH 34276, lateral view (F1) with detail of possible muscle scar (F2) located by arrows.
Fig. 2. Helcionelloid mollusc Eotebenna viviannae Peel, 1991a, MGUH 19564 in Muscle attachment scars in helcionelloids from Denmark cast light on mollusc evolution in the Cambrian
Fig. 2. Helcionelloid mollusc Eotebenna viviannae Peel, 1991a, MGUH 19564, holotype, internal mould, Andrarum Limestone, Bornholm, Denmark, Guzhangian, Miaolingian, middle Cambrian. A1. Oblique lateral view showing margin of shell (arrow) along the narrow slit joining the sub-apical and supra-apical apertures. A2. Oblique apico-lateral view. A3. Lateral view. A4. Oblique view showing inverted teardrop-shaped sub-apical aperture and irregular area (arrow) of possible muscle scar. A5. Lateral view of apex. A6. Oblique lateral view of apex showing radial fibrous structure beneath smooth outer layer.
Fig. 1. Pinnocaris and Eotebenna. A, B. Pinnocaris lapworthi Etheridge, 1878 in Pinnocaris and the origin of scaphopods
Fig. 1. Pinnocaris and Eotebenna. A, B. Pinnocaris lapworthi Etheridge, 1878, Ordovician, Girvan, southern Scotland; A1, A2, lateral view of internal mould of partially crushed specimen with adherent shell patches showing the pegma and the coiled protoconch, NHM In 20372, scale bars: A1 3 mm, A2 1 mm; B1, B2, lateral view of partially crushed specimen showing the coiled protoconch, NHM In 20400; scale bars: B1 3 mm, B2 1 mm. C. Eotebenna viviannae Peel, 1991, Middle Cambrian, Andrarum Limestone, Bornholm, Denmark, right side of phosphatic internal mould showing the protoconch, MGUH 19.565, scale bar 100 µm. D. Yochelcionella greenlandica Atkins and Peel, 2004, Lower Cambrian, Aftenstjernesø Formation, Peary Land, North Greenland, lateral view of right side showing the prominent snorkel, MGUH 27.018 from GGU sample 271470, scale bar 200 µm. E. Eotebenna arctica Peel, 1989, Lower Cambrian, Henson Gletscher Formation, Freuchen Land, North Greenland, lateral view which has been horizontally mirrored to enhance comparison, MGUH 18.701 from GGU collection 315109, scale bar 1 mm.
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