calyptocephalus

from The Century Dictionary.

• noun A genus of toads, of the family Cystignathidæ, having the skull most extensively ossified, the ossification involving the derm and overarching the temporal fossæ, whence the name. C. gayi, the type-form, is a large, green, web-footed Chilian species.
• noun In entomology, a genus of lampyrid beetles, founded by Gray in 1832, having the head entirely covered by the prothorax, and from 3 to 10 bipectinate antennal joints.