FIGURE 1. Historical photograph of the holotype skeleton (BRSMG Cb 2335) of Atychodracon megacephalus (Stutchbury, 1846). Photograph taken from glass plate negative in the Bristol City Museum & Art Gallery, originally published by Swinton (1948). Bristol City Museum & Art Gallery, reproduced with permission. Length of skeleton equals 4960 mm.

figure1

FIGURE 2. Plaster cast (BGS GSM 118410) of the holotype (BRSMG Cb 2335) skull of Atychodracon megacephalus (Stutchbury, 1846) in ventral (palatal) view. Three dimensional scan with texture (colour) removed. Scale bar equals 100 mm.

figure2

FIGURE 3. Plaster cast (BGS GSM 118410) of the anterior part of the holotype (BRSMG Cb 2335) skull of Atychodracon megacephalus (Stutchbury, 1846). 1-3, dorsal views, 4-6, ventral views. 1 and 4, three dimensional scans with texture (colour) removed, 2 and 5, photographs, 3 and 6, interpretations. Abbreviations: aiv - anterior interpterygoid vacuity; den - dentary; en - external naris; fo - nutritive foramina; fr - frontal; in - internal naris; mx - maxilla; pal - palatine; pmx - premaxilla; pt - pterygoid; sp - splenial; t - teeth; vom - vomer. Cross-hatching represents original broken surfaces, stippling represents original matrix. Scale bar equals 100 mm.

figure3

FIGURE 4. Plaster cast (BGS GSM 118410) of the anterior portion of the holotype (BRSMG Cb 2335) skull of Atychodracon megacephalus (Stutchbury, 1846). 1-3, right lateral view, 4-6, left lateral view, 7-9, oblique posterolateral view. 1, 4, 7, three dimensional scans with texture (colour) removed, 2, 5, 8, photographs, 3, 6, 9, interpretations. Abbreviations: aiv - anterior interpterygoid vacuity; ch - 'chin'; cor - coronoid; den - dentary; en - external naris; in - internal naris; mx - maxilla; pal - palatine; pmx - premaxilla; pt - pterygoid; sp - splenial; t - teeth; vom - vomer. Cross-hatching represents original broken surfaces, stippling represents original matrix. Scale bar equals 100 mm.

figure4

FIGURE 5. Posterior part of a plaster cast (BGS GSM 118410) of the holotype (BRSMG Cb 2335) skull of Atychodracon megacephalus (Stutchbury, 1846) in ventral (palatal) view. 1, three dimensional scan with texture (colour) removed, 2, photograph, 3, interpretation. Abbreviations: ang - angular; ar - articular; at - atlas; ax - axis; bs/bo? - basisphenoid or basioccipital; c3 - cervical vertebra 3; c8 - cervical vertebra 8; cr - cervical ribs; ec? - probable ectopterygoid; hy - hyoid; imf - internal mandibular foramen; mb - medial boss of retroarticular process; piv - posterior interpterygoid vacuity; ppt - posterior process of pterygoid; pro - possible additional process between zygapophyses; ps - parasphenoid; pt - pterygoid; ? - unknown element. Cross-hatching represents original broken surfaces, stippling represents original matrix. Scale bar equals 100 mm.

figure5

FIGURE 6. Transverse cross-sections of the plaster cast (BGS GSM 118410) of the holotype (BRSMG Cb 2335) skull of Atychodracon megacephalus (Stutchbury, 1846), showing surface morphology. 1, ventral view of skull showing position of cross-sections, 2-7, cross-sections, dorsal surface towards top. Abbreviations: aiv - anterior interpterygoid vacuity; chan - channels anterior to external nares; fl - ventrolaterally directed flanges of pterygoid; hy - hyoid; in - external nares; k - ventral keel on parasphenoid; piv - posterior interpterygoid vacuity; vlc - ventral longitudinal crest; vlf - ventrolateral flange. Scale bar equals 100 mm (in 1) and 50 mm (in 2-7 ), note that cross-sections are to scale relative to each other.

figure6

FIGURE 7. Plaster cast (BGS GSM 118410) of the ventral surface of the right forelimb of the holotype of Atychodracon megacephalus (Stutchbury, 1846) (BRSMG Cb 2335). 1, three dimensional scan with texture (colour) removed, 2, photograph, 3, interpretation. Abbreviations: 1 - distal carpal 1; 2-3 - fused distal carpals 2 and 3; 4 - distal carpal 4; h - humerus; i - metacarpal i; ii - metacarpal ii; iii - metacarpal iii; iv - metacarpal iv; v - metacarpal v; in - intermedium; r - radius; radiale; ra - radiale; u - ulna; ul - ulnare. Scale bar equals 100 mm.

figure7