Rhamphotheca


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

Rhamphotheca

 

the horny covering of a bird’s bill. The rhamphotheca forms the culmen on the upper jaw and the gonys on the lower jaw. It usually consists of one piece, but in cormorants, gannets, geese, skuas, and Procellariiformes it is made up of separate parts. The rhamphotheca may have various growths and teeth, and there is a cere in the proximal section of the rhamphotheca. Molting of the rhamphotheca usually involves the continual breaking and falling away of the horny layer; less frequently it falls off all at once, as in the seasonal molt of grouse.

Mentioned in ?
References in periodicals archive ?
The mass had grown slightly, but still was contained within the rhamphotheca of the lower left beak.
An 8-year-old male citron-crested cockatoo with an ulcerated, fleshy, crusty, and hemorrhagic mass invading the left lower rhamphotheca (black arrow) (A).
Photomicrograph of a fine-needle aspiration from the mass invading the left lower rhamphotheca of the citron-crested cockatoo described in Figure 1.