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7 results for “Lepidonotothen squamifrons”
Figure 4 in Morphological and histological study of the scales of the grey notothen, Lepidonotothen squamifrons (Günther 1880) (Nototheniidae; Perciformes; Teleostei)
Figure 4. – Mineralizing front of scales (SEM). A: Near the margin of the scale the basal plate is mineralized on its whole thickness (white asterisks) and the Mandl's corpuscles are small. At a small distance the basal plate is incompletely mineralized and the Mandl's corpuscles are bigger with an ovoid or a quadrangular shape (arrows). B: Detail of spherical and ovoid Mandl's corpuscles. C: Detail of the mineralizing front (anterior area) showing on the upper right merging Mandl's corpuscles (white arrows). On the left the mineralizing front is smooth with some Mandl's corpuscles not still merged with the mineralizing front (arrowheads). D: Detail of two quadrangular Mandl's corpuscles. Their surface is perfectly smooth. Scale bars: A, B = 20 μm; C = 10 μm; D = 5 μm.
Figure 1 in Morphological and histological study of the scales of the grey notothen, Lepidonotothen squamifrons (Günther 1880) (Nototheniidae; Perciformes; Teleostei)
Figure 1. – Drawing of three overlapped scales. The focus (fo) has a posterior location and the surface of the posterior area is reduced. The posterior margin is ornamented by some sharp spines, the ctenii (ct). an = anterior side; po = posterior side. Scale bar = 1 mm.
Figure 2 in Morphological and histological study of the scales of the grey notothen, Lepidonotothen squamifrons (Günther 1880) (Nototheniidae; Perciformes; Teleostei)
Figure 2. – Superficial view of scales (SEM). A: Detail of the circuli of the anterior area near the anterior margin. We show three radii (arrowheads) and the circuli with some very thin spines at their tip. In the inset, detail of the spines at the tip of the circuli. (scale bar = 7 μm). B: Detail of the circuli of the anterior area near the focus, between two radii. The circuli are thicker than the more anterior ones (compare with Fig. A). C: Detail of the posterior area. Four cteni are seen, the base of which are fit each other and with more ancient ctenial bases. Scale bars: A, C = 100 μm; B = 25 μm.
Figure 1 in Some histological data on bone and teeth in the grey notothen (Lepidonotothen squamifrons) and in the mackerel icefish (Champsocephalus gunnari) (Notothenioidei; Perciformes; Teleostei)
Figure 1. – Lepidonotothen squamifrons (227 mm SL). Cross section of the dental (APS-Groat-PIC). A: Bony tissue is deprived of osteocytes. Arrows point to vascular cavities. B: Detail of an erosive cavity showing active osteoclasts (arrowheads). The arrows point to osteoblastic canaliculi. C: Champsocephalus gunnari (150 mm SL) (AZAN). Bony tissue is deprived of osteocytes and osteoblastic canaliculi are seen (arrowheads). Scale bars: A = 250 μm; B, C = 25 μm.
Figure 3 in Morphological and histological study of the scales of the grey notothen, Lepidonotothen squamifrons (Günther 1880) (Nototheniidae; Perciformes; Teleostei)
Figure 3. – Transversal ground sections of a scale. A-B: Respectively transmitted natural light and polarized light showing the external layer (el) and the successive collagenous layers of the basal plate (bp). A: The arrowheads point to mineralized corpuscles of the basal plate under a radius (black asterisk). The white asterisks point to the mineralized part of the basal plate. B: In the basal plate (bp) lighted layers alternate with dark layers, indicating an orthogonal plywood-like organization. (el = external layer). C: X-ray showing the external layer (el) slightly hypermineralized relatively to the basal plate (white arrows) that is incompletely mineralized (white asterisks). The section crosses a radius (r) that is not mineralized. The arrow-head points to several mineralized Mandl's corpuscles at the bottom of the radius (compare this X-ray preparation to Fig. 3A). Scale bars: A = 10 μm; B, C = 20 μm.
Figure 2. – Lepidonotothen squamifrons. A in Some histological data on bone and teeth in the grey notothen (Lepidonotothen squamifrons) and in the mackerel icefish (Champsocephalus gunnari) (Notothenioidei; Perciformes; Teleostei)
Figure 2. – Lepidonotothen squamifrons. A: Cross section of the premaxilla (microradiography). B: Cross section of the dental (microradiography). C: Cross section of a dorsal spiny ray (microradiography). D: Cross section of a caudal vertebra (microradiography) showing the numerous vertebral bony arches fixed on the centrum. E: Detail of a section of a caudal vertebra (Polarized light showing the fibrous organization of bone and two vascular canals (arrowheads). F: Same section than Fig. E observed in transmitted natural light. The vascular canals are surround- ed by a reversal line (arrows). G: Detail of a section (polarized light) in a vertebral centrum showing growth marks. Scale bars: A = 500 μm; B = 250 μm; C, D, E, F = 200 μm; G = 50 μm. A: 415 mm TL; B-D, G: 333 mm TL; E, F: 250 mm TL.
Figure 3. – Lepidonotothen squamifrons. A in Some histological data on bone and teeth in the grey notothen (Lepidonotothen squamifrons) and in the mackerel icefish (Champsocephalus gunnari) (Notothenioidei; Perciformes; Teleostei)
Figure 3. – Lepidonotothen squamifrons. A: Horizontal section (microradiography) showing several cross sections of teeth on the right and the lower jaw on the left. B: Horizontal section (microradiography) taken lower than Fig. A. The wall of the pulp cavity of the central tooth (*) is crossed by vascular canals. We can see three very young non-functional teeth (arrowheads). C: Cross section of the lower jaw (microradiography) showing a young erupted tooth (arrow) and a fall- en tooth (*). D: Detail of a functional tooth showing the unmineralized ligament (arrowhead). E: Cross section of the jaw showing a tooth bud inserted in an alveola (arrow), beside a functional tooth (arrowhead). F, G: Cross section of a tooth (respectively in transmitted natural and polarized light. The more lateral dentinous tissue is striated, indi- cating the presence of odontoblastic canaliculi. (Scale bars: A, D = 250 μm; B, F, G = 150 μm; C = 500 μm; E = 1 mm. (A, B, F, G: 259 mm TL; C: 415 mm TL; D, E: 190 mm TL).
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