A new stethacanthid chondrichthyan from the lower Carboniferous of Bearsden, Scotland

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A Reappraisal of the Origin and Basal Radiation of the Osteichthyes (2010, background): “…Goujet and Young, 2004) is accepted here because it is the only arrangement discovered by analyses that can meaningfully test the intrarelationships of gnathostomes: those that root their shortest networks on jawless vertebrates (Coates and Sequeira 2001a, 2001b; Friedman, 2007a; Brazeau, 2009).”
The Evolution of Animal Weapons (2008, background): “Vertebrates: Fish, Amphibians, and Reptiles Jawless fish (Galeaspida) and sharks each radiated in the Devonian (∼400 Mya) and included many species with odd projections that may have functioned as weapons (Figure 4a) (45, 164, 167, 168).”