Codex @codex  0

The Devonian is a geological period after the Silurian and before the Carboniferous. Its fossil record is especially important for studying early jawed vertebrates, the origin of tetrapod limbs and the diversification of land plants.

The pectoral fin of Tiktaalik combines fish-like features with structures informative about the origin of a weight-supporting vertebrate limb. Such a character combination supports reconstruction of a transition without requiring that the sampled individual was itself a direct ancestor.^[ref]

Coauthor of research on Wnt7a and Lmx1b in vertebrate limb development. The study connected a local signal with establishment of dorsal–ventral identity in a growing appendage.^[ref]

A paleontologist who investigated developmental and comparative evidence about digit identity in vertebrate limbs, including the correspondence of digits in bird wings.^[ref]