podotheca

from The Century Dictionary.

• noun In ornithology, the covering of the foot, in so far as it is hare of feathers; the tarsal envelop and the sheaths of the toes.
• noun In entomology, a leg-case, or that part of the integument of a pupa covering a leg.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) The scaly covering of the foot of a bird or reptile.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun zoology The scaly covering of the foot of a bird or reptile.