FIG. 20 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada

FIG. 20. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada; details of specimen MHNM 01-150: A, B, head region in the part (A) and counterpart (B); C, detail view of the posterior gill arches of one side (area framed in Figure 19A); D, detail view of the lamellar mineralized structure at the posterior end of the lighter "black line" (area framed in Figure 19A). Scale bars: A, B, 10 mm; C, D, 5 mm.