FIG. 5. — Promesacanthus eppleri n. gen., n in Promesacanthus eppleri n. gen., n. sp., a mesacanthid (Acanthodii, Acanthodiformes) from the Lower Devonian of northern Canada

FIG. 5. — Promesacanthus eppleri n. gen., n. sp.: A, photograph of sclerotic plates and rostral scales of UALVP 42152; B, photograph of head scales level with the otic region of the braincase on UALVP 42152; C, postorbital scales of UALVP 43027; D, postorbital scales of UALVP 42152; E, anterior lateral line scales of UALVP 42152; F, ornament of hyoidean plates below the jaw articulation of UALVP 43027. Scale bars: 1 cm.