Figure 8 in The Late Cenozoic Passerine Avifauna from Rackham's Roost Site, Riversleigh, Australia

Figure 8. Comparison of fossil and extant acanthizid bones. Left carpometacarpi of (A–B) acanthizid gen. et sp. indet. QM F57928 and (C–D) Gerygone fusca AM O.66008 in (A,C) ventral and (B,D) dorsal aspects. Distal left tibiotarsi of (E) acanthizid gen. et sp. indet. QM F22796 and (F) Gerygone fusca AM O.66008 in cranial aspect. Some distinguishing features of Acanthizidae highlighted: 1, fovea lig. ventralis deep and recessed cranially; 2, ventral fossa on distal end of os metacarpale minus deep; 3, proc. dentiformis prominent and situated at proximo-distal midpoint of os metacarpale majus; 4, fovea carpalis caudalis small and shallow; 5, distal shaft narrow with respect to width of distal end; 6, pons supratendineus long; 7, lateral bony ridge for retinaculum m. fibularis well developed; 8, tuberositas retinaculi extensori lateralis prominent. Scale bar = 2 mm.