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).