Fig. 6

Comparative skull and pectoral girdle of living Ariidae. a, b Amphiarius rugispinis (Valenciennes), UNEFM PR-04; c, d Aspistor quadriscutis (Valenciennes), UNEFM PR-012; e, f Bagre marinus (Mitchill), UNEFM PR-011; g, h Cathorops wayuu, (Betancur-R., Acero and Marceniuk), UNEFM PR-010; i, j Genidens planifrons (Higuchi, Reis and Araújo), FURG- uncatalog; k, l Notarius grandicassis (Valenciennes), UNEFM PR-012; m, n Sciades parkeri (Traill), UNEFM PR-070; o C. hypophtalmus (Steindachner), STRI 5.4.2.2; p C. dasycephalus (Günther), STRI 5.2.1.7; q C. multiradiatus (Günther), INVEMAR-PEC 6798; r C. arenatus (Valenciennes), USNM 233482. adp-cl anterior dorsal process of cleithrum, cl cleithrum, dg dorsal groove, dspe dorsal spine, ex extrascapula, fr frontal, me mesethmoid, np nuchal plate, pdp-cl posterior dorsal process of cleithrum, pp-cl posterior process of cleithrum, pt pterotic, pttsc posttemporal-supracleitrum, psoc parieto-supraoccipital, psocp parieto-supraoccipital process, sp sphenotic, spt spinelet. Scale bar 10 mm (scale unavailable in figures q and r) (plate and photos modified from Aguilera and Rodrigues de Aguilera 2004; and Aguilera and Luckenbill, http://catfishbone.acnatsci.org/Ariidae/index.html; photo q courtesy of R. Betancur-R; photo r courtesy of A. Marceniuk)