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FIG. 40 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 40. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada; attempted reconstruction of the mineralized elements (black) based on MHNM 01-123 and 135A, in lateral view (axial endoskeleton of the tail and eye outline are hypothetical, caudal fin radials based on MHNM 01-02 and 01-79B; "diffuse mineralized matter" and "white line" omitted). Not to scale.
FIG. 37 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 37. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada; photograph in immersion in alcohol (A) and camera lucida drawing (B) of the central part of the visceral cavity and stomach contents of MHNM 01-98A, showing some imprints interpreted as possible blood vessel imprints. Scale bar: 1 mm.
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.
FIG. 36 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 36. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada, imprint of the visceral cavity in MHNM 01-02B (A) and 01-98 (B). Photographed in immersion in alcohol. Scale bars: 1 mm.
FIG. 34 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 34. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada; specimen MHNM 01-02A: photograph in immersion in alcohol (A) and camera lucida drawing (B1) of the posterior part of the branchial apparatus and the overlying structure (framed in C), regarded by Arsenault & Janvier (1991) as the possible imprint of the heart; B2, detail drawing of the elongated black grains, which suggest that this structure may rather be either gut contents, or "diffuse mineralized matter". Scale bars: A, B1, 1 mm; B2, 0.1 mm.
FIG. 32 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 32. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada: A, incomplete ventrolaterally collapsed specimen (MHNM 01-125A) photographed in immersion in water, and showing the series of paired fin radials overprinted on the branchial apparatus; framed areas are shown in detail in Figure 33; B, explanatory sketch. Scale bar: 5 mm.
FIG. 33 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 33. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada; detail views of the branchial apparatus and paired fin radials of MHNM 01-125A (areas framed in Figure 32A): A, dorsal boundary of the branchial apparatus, showing the loop-shaped structures assumed to be parts of the sinuous portion of the gill arches; B, assemblage of gill arch fragments and "gill rods"; C, ventral margin of the body, showing some gill arches and "gill rods", and a series of paired fin radials. Photographed in immersion in water. Scale bar: 1 mm.
FIG. 30 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 30. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada; posterior part of the branchial apparatus, posterior paired fin radials and anal fin of MHNM 01-123, photographed in immer- sion in water. Scale bar: 10 mm.
FIG. 31 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 31. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada: A, detail of the paired fin radials in MHNM 01-135A (area framed in B). Photographed in immersion in alcohol. Scale bar: 10 mm.
FIG. 29 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 29. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada: posterior extremity of the caudal fin of MHNM 01-79B, photographed in immersion in water (A), and camera lucida drawing of the same specimen (B). Scale bar: 10 mm.
FIG. 27 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 27. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada; elements referred to here as the "annular cartilage" and the "anterior ventral rod" in MNHN 01-123 (A) and 01-135A (B). Photographed in immersion in water. Scale bars: 10 mm.
FIG. 28 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 28. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada: photograph in immersion in water (A) and camera lucida drawing (B) of the mineralized skeletal elements of MHNM 01-123 at the level of the anal fin (area framed in C); black areas in the "posterior haemal series" indicate the extent of the more compact mineralized layer. Scale bar: 10 mm.
FIG. 26 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 26. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada: A, attempted reconstruction of the branchial apparatus, showing the relations between the gill arches and the dorsal and ventral "copular elements", diagrammatically figured here as cu- bic; the "gill rods" are omitted; B, horizontal section of a gill unit, showing three possible reconstructions of the position of the "gill rods". Not to scale.
FIG. 23 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 23. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada; specimen MHNM 01-135A, showing the head and paired fin skeleton, and the part of the disarticulated axial skeleton: A, photograph in immersion in water (detailed view of the branchial apparatus and ventral copular series in framed areas are shown in Figure 24); B, explanatory drawing ("gill rods" and middle part of gill arches omitted). Scale bar: 50 mm.
FIG. 25 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 25. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada; detail view of the posterior region of the branchial apparatus of MHNM 01-135B, showing the numerous and closely packed "gill rods" (A) and the regular arrangement of certain curved elements, regarded here as either looping "gill rods", or overprinted portions of right and left sinuous gill arches (B). Photographed in immersion in water. Scale bars: 2 mm.
FIG. 24 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 24. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada; details of the ventral copular elements and gill arches of MHNM 01-135A in the areas framed in Figure 23A: A, posterior part of the ventral series of "copular elements"; B, anterior part of the ventral series of "copular elements" and posterior extremity of the "anterior ventral rod". Photographed in immersion in water. Scale bars: 10 mm.
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.
FIG. 22 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 22. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada: photograph, in immersion in water (A), and camera lucida drawing (B) of the posterior part of the ventral series of "copular elements" in MHNM 01-123, showing the processes possibly connecting the ventral "copular elements" (area framed in C). Scale bar: 10 mm.
FIG. 17 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 17. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada; "braincase" and "head stains" of MHNM 01-123: photograph (A, in immersion in water) and camera lucida drawing (B) of the area framed in C. Scale bar: 10 mm.
FIG. 5 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada
FIG. 5. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada; specimen MHNM 01-123 showing an extensively mineralized skeleton (see also Figure 16 for details), and photographed in immersion in alcohol in order to enhance the carbonaceous imprint of the non-mineralized tissues of the body and the "head stains" (dark zones at the anterior end of the head and in the dorsal half of the body). Scale bar: 50 mm.
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