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33 results for “Cheiracanthus”
FIGURE 24 in A redescription of the three longest-known species of the acanthodian Cheiracanthus from the Middle Devonian of Scotland
FIGURE 24. Cheiracanthus latus head and branchial region, morphology. 1-2, NHM PV P 3253 from Tynet Burn. 3, NMS G.1891.92.320 from Gamrie. 4, NHMUK PVP43273 from Tynet Burn, branchial region with ridges visible on lowest branchiostegal plates. Abbreviations: br.l, left branchiostegal plates; br.r, right branchiostegal plates; cop, circumorbital plate; gr, gular rays; Mc.l, left Meckel's cartilage; Mc.r, right Meckel's cartilage; pect.fs, pectoral fin spines; pq.l, mineralised cartilage along ventral edge of left palatoquadrate; proc, procoracoid; sc, scapulocoracoids; tess, head tesserae. Scale bars equal 10 mm.
FIGURE 25 in A redescription of the three longest-known species of the acanthodian Cheiracanthus from the Middle Devonian of Scotland
FIGURE 25. Cheiracanthus latus head and branchial region, histology, NMS G.2019.3.3; position of sections shown in Figure 6.6. 1, 2, thin section NMS G.2019.3.3.3: 1,?Meckel's cartilage; 2, closeup of calcified cartilage blocks; 3, 4, NMS G.2019.3.3.5, indet. jaw cartilage and branchial arches; 5, NMS G.2019.3.3.2, branchiostegal plate in oblique section, body scales, branchial denticles, indet. cartilage; 6, NMS G.2019.3.3.4, body scales, gill bars; 7, 8, NMS G.2019.3.3.17: 7, jaw cartilage, head tesserae, gill bars, branchiostegal plates; 8, head tessera vertical section, stellate mineralisation artifacts. Scale bars equal 1.0 mm in 1, 3, 5, 7, 0.1 mm in 2, 4, 6, 8. ba, branchial arch; br, branchiostegal plate; ccb, calcified cartilage blocks; d, denticle; gb, gill bar; gcc, globular calcified cartilage; gz, growth zones in crown; s, body scale; t, tessera.
FIGURE 19. Cheiracanthus grandispinus NMS G.2019.9.7 in A redescription of the three longest-known species of the acanthodian Cheiracanthus from the Middle Devonian of Scotland
FIGURE 19. Cheiracanthus grandispinus NMS G.2019.9.7, serial sections of pectoral (22-15) and pelvic (9-14, 23) spines, thin section drawings, numbered as on map in Figure 6.4.
FIGURE 16 in A redescription of the three longest-known species of the acanthodian Cheiracanthus from the Middle Devonian of Scotland
FIGURE 16. Cheiracanthus grandispinus head and branchial region, histology. 1-3, NMS G.2019.9.8: 1, 2, NMS G.2019.9.8.8 series of endoskeletal branchial rays, some showing gill raker projections; 3, NMS G.2019.9.8.14 calcified cartilage blocks; 4, NMS G.2019.9.35.1, calcified cartilage of Meckel's cartilage? Scale bars equal 0.1 mm. gb, gill bars; gbp, gill bar projections; gcc, globular calcified cartilage; s, scale.
FIGURE 18. Cheiracanthus grandispinus spines histology. 1-5, NMS G.2019.9.7 in A redescription of the three longest-known species of the acanthodian Cheiracanthus from the Middle Devonian of Scotland
FIGURE 18. Cheiracanthus grandispinus spines histology. 1-5, NMS G.2019.9.7 from Achanarras: 1-3, NMS G.2019.9.7.21, thin section of distal end of pectoral spine, with closeups of the structure of the leading edge ridge and boundary between the main spine osteodentine and the areas bounding the trailing edge groove; 4, NMS G.2019.9.7.11, TS pelvic spine; 5, NMS G.2019.9.7.12, TS through both pelvic fin spines. 6, 7, NMS G.2019.9.8 from Jessie Port, median spine,?anal: 6, TS NMS G.2019.9.8.8 at proximal end of exserted part; 7, NMS G.2019.9.8.15, towards mid spine. 8-10, NMS G.2019.9.35.1-7 from Achanarras, pectoral spine: 8, 9, NMS G.2019.9.35.2, midspine; 10, NMS G.2019.9.35.3, more distal. Scale bars equal 0.5 mm in 1, 4-8, 10, 0.1 mm in 2, 3, 9. bc, basal cartilage.
FIGURE 15 in A redescription of the three longest-known species of the acanthodian Cheiracanthus from the Middle Devonian of Scotland
FIGURE 15. Cheiracanthus grandispinus head and branchial region, morphology. 1-2, NMS G.1966.40.24 from Lethen Bar. 3, NMS G. FR1603 from Achanarras Quarry, Caithness. 4, NMS G.2002.26.1481 from Achanarras Quarry. 5, NMS G.1903.130.19 from Achanarras Quarry, dorsoventrally flattened. 6, NHMUK PVP.1363 from Orkney. Scale bars equal 10 mm. addf, adductor muscle fossa; artc, articular cotylus; br, branchiostegal rays; cr.epq, extrapalatoquadrate ridge; gr, gular rays; Mc, Meckel's cartilage; pdbr, posterodorsal branchiostegal rays; pq, palatoquadrate; pqv, palatoquadrate vacuity; pregl, preglenoid process. Anterior to right in 1-3, 6, to left in 4-5.
FIGURE 5. 1 in A redescription of the three longest-known species of the acanthodian Cheiracanthus from the Middle Devonian of Scotland
FIGURE 5. 1, Site map indicating the most important localities in northern Scotland where Middle Devonian Cheiracanthus specimens have been collected, land in white, current shoreline in blue, alluvial plains in yellow, alluvial fans in ochre; main lake area in blue; 2, biostratigraphic table of Cheiracanthus species occurrences in the Orcadian Basin of northern Scotland. Modified from Burrow et al. (2016, figure 2).
FIGURE 22 in A redescription of the three longest-known species of the acanthodian Cheiracanthus from the Middle Devonian of Scotland
FIGURE 22. Cheiracanthus grandispinus comparison of scale structure in different sized fish. 1, NMS G.2019.9.5.2, from Achanarras, small fish c. 10 cm long, vertical transverse section through scale anterior. 2, NMS G.2019.9.6.1, from Achanarras, medium sized fish less than 30 cm long, vertical transverse section through scale anterior. 3, NMS G.2019.9.8.12, from Jessie Port, medium sized fish, vertical transverse section through scale anterior. 4, NMS G.2019.9.9.14, from Achanarras, fish 30 cm or longer, vertical transverse section through scale anterior. 5, NMS G.2019.9.9.7, from Achanarras, fish 30 cm or longer, vertical longitudinal section. NMS G.2019.9.35.4, medium sized incomplete fish, vertical section of scale showing Sharpey's fibre bundles through base. Scale bars equal 0.1 mm.
FIGURE 10. Cheiracanthus murchisoni NMS G.2019.3.6 in A redescription of the three longest-known species of the acanthodian Cheiracanthus from the Middle Devonian of Scotland
FIGURE 10. Cheiracanthus murchisoni NMS G.2019.3.6 from Gamrie, scapula shaft and pectoral spine histology. 1, NMS G.2019.3.6.27, transverse section of scapula shaft. 2-6, transmission microscope images of NMS G.2019.3.6.14, 15, 16, 18, 19; 7, drawings of main histological features in thin sections 19-14, from tip to near the base of the exserted part. Scale bars equal 0.1 mm in 1-3, 0.5 mm in 4-6. co, canal opening; en, enameloid; r, sharp crested lateral ridges.
FIGURE 20. Cheiracanthus grandispinus scale morphology. 1-3, 5-9 in A redescription of the three longest-known species of the acanthodian Cheiracanthus from the Middle Devonian of Scotland
FIGURE 20. Cheiracanthus grandispinus scale morphology. 1-3, 5-9, light microscope images; 4, 10-18, SEM images; midbody scales unless detailed otherwise. 1, NMS G.1891.92.317 from Lethen Bar. 2, NMS G.2019.9.8 from Jessie Port, Ross and Cromarty. 3, 4, USCP F00115b from Edderton. 5, NMS G.2019.9.9 from Achanarras, primordial scale revealed after abrasion/flaking of overlying crown growth zones. 6-9, NMS G.2019.9.10.1 from Cromarty: 6, mid-body scales; 7-9, pectoral fin web: spine and web; 8, distal scales; 9, scales near fin base. 10-12, NMS G.2019.9.11 from Marwick: 10, view of crown before removal of scale from matrix; 11, anterocrown view; 12, posterior view. 13, NMS G.2019.9.3.27.1 from Gamrie Den of Findon, laterocrown view. 14-18, NMS G.2019.9.13.8 from Cromarty, Eathie to Navity: 14, NMS G.2019.9.13.8.16, anterocrown view; 15, NMS G.2019.9.13.8.2 pair of scales in posterocrown view; 16, NMS G.2019.9.13.8.8, laterocrown view; 17, NMS G.2019.9.13.8.6, lateral view; 18, NMS G.2019.9.13.8.17, posterobasal view. Scale bars equal 0.5 mm in 1-9, 0.2 mm in 10-18. p, neck protuberance; ps, primordial scale. Arrows indicate anterior.
FIGURE 7. Cheiracanthus murchisoni head and branchial region morphology. 1, 2, NMS G.1884.60.3 from Tynet Burn. 3, NMS G.2019.9.24 from Cruaday Quarry, Orkney. 4, NRM P1651 from Gamrie, sclerotic ring. 5, NRM P1654 from Tynet Burn, sclerotic ring. 6, NMS G.2000.65.2 from Tynet Burn. 7, NMS G.2019.14.2 from Tynet Burn. 8, 9, NRM P1560 in A redescription of the three longest-known species of the acanthodian Cheiracanthus from the Middle Devonian of Scotland
FIGURE 7. Cheiracanthus murchisoni head and branchial region morphology. 1, 2, NMS G.1884.60.3 from Tynet Burn. 3, NMS G.2019.9.24 from Cruaday Quarry, Orkney. 4, NRM P1651 from Gamrie, sclerotic ring. 5, NRM P1654 from Tynet Burn, sclerotic ring. 6, NMS G.2000.65.2 from Tynet Burn. 7, NMS G.2019.14.2 from Tynet Burn. 8, 9, NRM P1560 from Gamrie: 8, detail of branchiostegal rays; 9, impression of spiracular valve. Scale bars equal 10 mm in 1, 3, 6, 7; 5 mm in 4, 5; 2 mm in 8, 9. addf adductor muscle fossa; artc, articular cotylus; br, branchiostegal rays; ch, ceratohyal; gr, gular rays; Mc, Meckel's cartilage; pdbr, posterodorsal branchiostegal rays; pq, palatoquadrate; pqv, palatoquadrate vacuity; pregl, preglenoid process; scl, sclerotic plate; t-l, tooth-like elements. Arrows indicate anterior.
FIGURE 3 in A redescription of the three longest-known species of the acanthodian Cheiracanthus from the Middle Devonian of Scotland
FIGURE 3. Cheiracanthus grandispinus holotype SM H4423 from Orkney. 1, mirrored illustration of specimen and scales from M'Coy (1855, plate 2.B, figure 1); 2, specimen in present condition. Scale bar equals 20 mm.
FIGURE 33 in A redescription of the three longest-known species of the acanthodian Cheiracanthus from the Middle Devonian of Scotland
FIGURE 33. Reconstruction of a whole Cheiracanthus latus in lateral view.
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