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8 results for “Machaeracanthus”
FIG. 7. — Machaeracanthus goujeti n in Machaeracanthus goujeti n. sp. (Acanthodii) from the Lower Devonian of Spain and northwest France, with special reference to spine histology
FIG. 7. — Machaeracanthus goujeti n. sp.; Lower Devonian, Iberian Chain. Transverse section of middle part of spine MPZ 2010/958, juvenile: A, general view of upper longitudinal ridge, wing and pulp cavity; B, C, details of the hard tissues in the wing close to the central axis, showing lamellar dentine with growth increment and trabecular dentine with denteons; D, detail of centripetally growing trabecular dentine around the pulp cavity. Thin section observed in transmitted ordinary light. Abbreviations: see Material and methods Scale bars: A, 0.5 mm; B, D, 0.1 mm; C, 50 μm.
FIG. 9 in Machaeracanthus goujeti n. sp. (Acanthodii) from the Lower Devonian of Spain and northwest France, with special reference to spine histology
FIG. 9. — Scales of Machaeracanthus goujeti n. sp., Lower Devonian, Iberian Chain: A, B, element MGUV-15.075, Nogueras Fm, section Ni-2 (NI), in crown (A) and basal (B) views; C, D, element MGUV-15.077, Nogueras Fm., section Ni-2 (NI) in crown (C) and rostral (D) views; E, F, element MGUV-15.078, Nogueras Fm, section Ni-2 (NI), in crown (E) and rostral (F) views; G, element MPZ 2010/949, lateral view, Nogueras Fm., section Bco. Sur Sto. Domingo (ADRC); H, element MGUV-15.079, Nogueras Fm., section Bco. Sur Sto. Domingo (ADRC), basal view; I, element MGUV-15.080, Nogueras Fm., section Poyales-East (ADRC), crown view; J, element MGUV-15.082, Nogueras Fm., section Poyales-East (ADRC), crown view; K, element MGUV-15.081, Nogueras Fm., section Bco. Sur Sto. Domingo (ADRC), rostral view; L, element MGUV-15.076, Nogueras Fm, section Ni-2 (NI), anterior crown view. Scale bars: A-H, L, 500 μm; I-K, 250 μm.
FIG. 6. — Machaeracanthus goujeti n in Machaeracanthus goujeti n. sp. (Acanthodii) from the Lower Devonian of Spain and northwest France, with special reference to spine histology
FIG. 6. — Machaeracanthus goujeti n. sp.; Lower Devonian, Iberian Chain. Transverse section of distal part of spine MPZ 2010/955A, juvenile: A, general view; B, C, details of the upper longitudinal ridge. Arrows in C point to distal branches of dentinal tubules. Thin section observed in transmitted ordinary light. Abbreviations: see Material and methods. Scale bars: A, 0.5 mm; B, 0.1 mm; C, 50 μm.
FIG. 8. — Machaeracanthus goujeti n in Machaeracanthus goujeti n. sp. (Acanthodii) from the Lower Devonian of Spain and northwest France, with special reference to spine histology
FIG. 8. — Machaeracanthus goujeti n. sp.; Lower Devonian, Iberian Chain. Transverse section proximal part of spine MPZ 2009/27. A, general view of wing; B, detail of the wing (see framed area in A) showing trabecular dentine with taphonomic alteration; C, detail of B exhibiting the dentinal tubules. Thin section observed in transmitted ordinary light. Abbreviations: see Material and methods. Scale bars: A, 0.5 mm; B, 0.1 mm; C, 50 μm.
FIG. 3. — Machaeracanthus goujeti n in Machaeracanthus goujeti n. sp. (Acanthodii) from the Lower Devonian of Spain and northwest France, with special reference to spine histology
FIG. 3. — Machaeracanthus goujeti n. sp.; Lower Devonian, Iberian Chain; juvenile spine (morphotype 1) (MPZ 2010/950), Nogueras Fm., section Maripló (ADRC); Mpl26): A, upper surface view; B, lower surface view; C, trailing edge view. Arrows point to the distal end of wing and keel. Abbreviations: see Material and methods. Scale bar: 1 mm.
FIG. 5. — Machaeracanthus goujeti n in Machaeracanthus goujeti n. sp. (Acanthodii) from the Lower Devonian of Spain and northwest France, with special reference to spine histology
FIG. 5. — Machaeracanthus goujeti n. sp., Lower Devonian, Iberian Chain. Transverse sections of spines showing the development of pulp cavity and vascular pattern: A, distal part of spine MPZ 2010/955A, juvenile (morphotype 1), Nogueras Fm., Poyales-East (ADRC); B, middle part of spine MPZ 2010/958, juvenile (morphotype 1); C, proximal part of spine MPZ 2009/27 (morphotype 1), Nogueras Fm., Poyales-East; D, middle part spine MPZ 2010/959 (morphotype 2). Abbreviations: see Material and methods. Scale bars: 1 mm.
FIG. 2 in Machaeracanthus goujeti n. sp. (Acanthodii) from the Lower Devonian of Spain and northwest France, with special reference to spine histology
FIG. 2. — Synthetic columns of the axial depression of Nigüella (NI) (A) and of the axial depression of the Río Cámaras (ADRC) (B) with the distribution of the different types of remains attributed to Machaeracanthus goujeti n. sp. from the Lochkovian-Pragian strata of the Nogueras Fm. (modified from Valenzuela-Ríos & Botella 2000; Botella & Valenzuela-Ríos 2005).
FIG. 1. — A in Machaeracanthus goujeti n. sp. (Acanthodii) from the Lower Devonian of Spain and northwest France, with special reference to spine histology
FIG. 1. — A, Geographical setting of the studied area with indication of the distribution of Precambrian and Palaeozoic rocks in the Iberian Peninsula; B, geological map of Palaeozoic rocks in the Iberian chains pointing out the two studied areas (Devonian outcrops in black). Abbreviations: ADRC, axial depression of the Río Camaras (Carls 1988); NI, axial depression of Nigüella (Valenzuela-Ríos 1989).
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