Fig. 9 in Early Frasnian acanthodians from central Iran

Fig. 9. Diplacanthid acanthodian Milesacanthus sp. aff. M. antarctica Young and Burrow, 2004 from early Frasnian, horizon GI4 of an unnamed formation in the Chahriseh section, Kaftari Mt., central Iran. Photomicrographs of thin sections of flank scales in vertical longitudinal (A) and vertical transverse (B) sections. A. Thin section LIGG 3800. Structure of syncitial mesodentine with mainly upwardly directed dentine tubules in the upper crown part, unbranched ascending vascular canals in the lower crown part, and numerous elongated?vascular canals and Sharpey's fibres piercing an acellular bone in scale base. B. Thin section LIGG 3801. B1, ascending, radial and?pore canals of the neck area, knot of canals in primordial zone, and small?vascular canals in an acellular bone of base, all exposed in a section made through the anterior, most ridged crown part; B2, positioning of fungal hyphae of a magnified area in the upper right corner of crown of the same scale. Scale bars 0.1 mm.