Tarsometatarsus n. : The large bone next the foot in the leg of a bird. It is formed by the union of the distal part of the tarsus with the metatarsus.

Example:


Taxonomy
tarsometatarsus, bone, birds, fusion, free encyclopedia, bird evolution, Mesozoic birds, search, skeleton, number 8, lower leg, types of animals, mammalian, tarsal, ankle, metatarsal, several ways, extents.

Defination from the web:
tarsometatarsus is clearly visible. ... Their oldest remains date from the Late Triassic more than 200 million years ago, and predate the first birds with a tarsometatarsus by nearly 100 million years. ...