Fig. 11 in Early Frasnian acanthodians from central Iran

Fig. 11. Diplacanthid spine morphology and histology. Early Frasnian, horizon GI4 of an unnamed formation in the Chahriseh section, Kaftari Mt., central Iran. A. AEU 320, fin spine in lateral (A1) and leading edge (A2) views. B. Histological microstructure of a diplacanthid fin spine. Vertical transverse section LIGG 3807 of spine fragment which had two roundedquadrangular sculptural ribs (lost during sectioning, but were positioned at top). B1, general structure of an osseous vascularised tissue embracing all of the preserved spine; B2, abundant osteocyte cells densely displaced among the large vascular canals appeared in two perpendicular directions, longitudinal and transverse.