Fig. 5.

Morphology of skull, hyobranchial skeleton and rectus cervicis musculature in metamorphic (a, c and e) and paedomorphic (b, d and f) Alpine newts in lateral (a and b), ventral (c and d) and dorsal views (e and f). The skull is virtually removed in e and f to allow free view to the dorsal face of the hyobranchial skeleton and the rectus cervicis musculature. Golden colour indicates bony tissue, blue cartilage and the rectus cervicis muscle is indicated in red. Abbreviations: Ar, articular; At, atlas (cervical vertebra); Bb, basibranchial; Cb1–4, ceratobranchial 1–4; Chy, ceratohyal; De, dentary; Ex, exoccipital; Fr, frontal; Hb1–2, hyobranchial 1–2; Hh, hypohyal (=radial); Mx, maxillary; Na, nasal; Os, orbitosphenoid; Pa, parietal, Pm, premaxillary; Q, quadrate; RC, rectus cervicis musculature; Sq, squamosal; Vo, vomerine. Scale bars: 5 mm