BIOL 2030 Lecture Notes - Lecture 15: Archaeopteryx, Dactyly, Keratin
Document Summary
Archaeornithes a subclass of primitive reptile-like fossil birds including archaeoptyrex. Aves birds, a class of bipedal homoiothermic vertebrates having the body clothed in feathers and front limbs modified as wings, and the skin of the jaw forming a horny bill (beak). They are descended from the extinct archosaurian reptiles. Barb one of the delicate threadlike structures extending from the shaft of a feather and forming the vane. Barbule lateral projection from barb of feather, serving to hold barbs together to form an. Contour feathers outermost feathers that cover the body of birds unbroken vane. The first fluffy feathers of young brids, with a short quill and with barbules not interlocking to form a flat vane. Some birds retain a down layer under adult plumage. Filoplumes delicate hair-like feather with long axis and a few free barbs at apex. Follicle sheath of epithelium surrounding hair or feather root. Furcula the united clavicles of birds, the wishbone.
