The joints of the elbow provide evidence of the independent
mobility of the radius and ulna (Figs 6b and 7). As in Acanthostega22,
the humeral facets for the radius and ulna are separate from one
another, in contrast to the confluent facets in Eusthenopteron9 and other non-tetrapodomorph fishes25. The radial facet is smaller than
and anteroventral to the ulnar facet. Neither facet faces exactly
distally; both are slightly ventrally oriented, with the radial facet
more so than the ulnar. On this evidence the antebrachium would
have been slightly flexed in the rest position, with the radius more
flexed than the ulna.