Despite myriad challenges, clinicians see room for progress.
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Contributed by Neil H. Shubin, December 3, 2013 (sent for review November 12, 2013)
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Figures
- Fig. 1.
Right pelves of Gooloogongia (A), Eusthenopteron (B), and Acanthostega (C) in lateral view. Gooloogongia is preserved as a natural cast in one orientation. Figures were modified from refs. 10, 12, and 14. Cranial is to the right.
- Fig. 2.
Type specimen (NUFV108): ventral surface of cranial block (figured in ref. 6) aligned in preserved position with ventral view of the block containing the pelvic fin. (Inset) Line diagram of lepidotrichia and preserved portions of endochondral bones of pelvic fin. f, fin; i, intermedium?; l, lepidotrichia; r, radials.
- Fig. 3.
Tiktaalik roseae, stereopairs of the right pelvis from NUFV108 in (A) ventral (cranial is to the Top), (B) dorsal (cranial is to the Bottom), (C) caudal (lateral is to the Right), and (D) cranial views (lateral is to the Left). A, acetabulum; i, ilium; p, pubis; r, ossified ridge; u, unfinished bone.
- Fig. 4.
Cladogram with right pectoral and pelvic girdles drawn to the same scale. (A) Pectoral girdles in lateral view. (B) Pelvic girdles in ventral view. (C) Pelvic girdles in lateral view. Figures were modified, and relative proportions were derived, from refs. 10, 16, and 17, and NUFV108. Cranial to the Right in A and C; Cranial at the Top in B.
- Fig. 5.
Acanthostega (Top), Tiktaalik (Middle), and Eusthenopteron (Bottom) reconstructions with pectoral and pelvic girdles (proportions were derived from refs. 10, 16, and 17 and NUFV108).
- Fig. 6.
Reconstruction of the skeleton of Tiktaalik roseae, updated from ref. 6.
Pelvic girdle and fin of Tiktaalik roseae
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