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7 results for “Cornulites”
Figure 6 in Systematics, shell structure and affinities of the Palaeozoic Problematicum Cornulites
Figure 6. Shell structures in Cornulites cellulosus sp. nov. A, B, BU 4378, ×60. Longitudinal section through apertural version of shell showing continuity between lamellae (lam) in the shell wall and partitions bounding cellulae (cel): selected lamellae are highlighted in B, 'ag' indicates the apertural groove. The pattern of overlap in the lamellae shows that growth occurred in the direction indicated by the arrows.
Figure 5 in Systematics, shell structure and affinities of the Palaeozoic Problematicum Cornulites
Figure 5. Shell structures in Cornulites cellulosus sp. nov. A–C, BU 4371, pseudopuncta. A, transverse view, ×45, B, longitudinal view, ×45. C, ESEM image of transverse section (scale bar = 20 µm), shell interior towards top in all images. D, BU 4371, ESEM image of transverse section across mid-region shell wall, showing bipartite structure within lamellae, scale bar = 10 µm. E, BMNH A455, transverse section across apertural region showing concentric lamellae and apertural groove filled with cellulae, ×4. F, G, BMNH A459. F, transverse section close to aperture, ×3.25. G, close-up of concentric lamellae, separated by zones of cellulae, ×4.
Figure 9 in Systematics, shell structure and affinities of the Palaeozoic Problematicum Cornulites
Figure 9. Development of cellulae in Cornulites cellulosus sp. nov. A, B, BU 4378, ×60. Longitudinal section through annulation in apertural region of shell, showing stacking of cellulae (cel) and lamellae (lam). Lamellae deposited at selected time intervals t0–t5 are highlighted in B; black arrows represent growth directions within and between cellulae. L1 and L2 are thickened series of lamellae without cellulae, and represent later shell layers that closed off and overgrew the lamellae and cellulae of an earlier growth stage.
Figure 3. Cornulites scalariformis Vine, 1882 in Systematics, shell structure and affinities of the Palaeozoic Problematicum Cornulites
Figure 3. Cornulites scalariformis Vine, 1882, Much Wenlock Limestone Formation, Dudley. A, B, four specimens attached to brachiopod BU 4373. A, ×2.25, B, ×3. C, three specimens attached to brachiopod BU 4374, ×3. D, NHM A847, ×0.75.
Figure 7. A, B in Systematics, shell structure and affinities of the Palaeozoic Problematicum Cornulites
Figure 7. A, B, BU 4387, C. scalariformis, longitudinal
Figure 1 in Systematics, shell structure and affinities of the Palaeozoic Problematicum Cornulites
Figure 1. Morphology of Cornulites. A, external morphology, showing apertural groove (ag), annulations (ann) and costae (cos). B, internal morphology in longitudinal section. BU 4390, C. cellulosus, apical and mid-region, showing lamellar shell wall (lam), with internal tabulae (tab) and camerae (cam) in apical region, ×6. Cellulae (cel) occur towards the apertural end of the specimen.
Figure 8 in Systematics, shell structure and affinities of the Palaeozoic Problematicum Cornulites
Figure 8. Schematic reconstruction of Cornulites shell
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