FIG. 38 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada

FIG. 38. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada; specimen MHNM 01-69A: photograph in immersion in water (A) and camera lucida drawing (B) of the anterior part of the head of MHNM 01-69A (area framed in C; same specimen as in Figure 4A); D, E, detail photograph (D) and camera lucida drawing (E) of the "doughnut-shaped structure" (area framed in A). Scale bars: A, B, 5 mm; D, E, 1 mm.