Members of carinatae has keel?
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A keel or carina (plural carinae) in bird anatomy is an extension of the sternum(breastbone) which runs axially along the midline of the sternum and extends outward, perpendicular to the plane of the ribs.
The keel provides an anchor to which a bird's wing muscles attach, thereby providing adequate leverage for flight. Keels do not exist on all birds; in particular, some flightless birds lack a keel structure.
The presence or absence of a pronounced keel structure was used as a broad classification of birds in two orders:-
CARINATAE ( from carina - "keel") and RATITES ( from ratis - "raft" referring to flatness of the sternum)
Having subtle keel structure or lacking one entirely . However , This classification has fallen into disuse as evolutionary studies have shown that many flightless birds have evolved from fliighted birds .
The current definition of carinatae now includes all extant birds.
hope it helps u ^_^
The keel provides an anchor to which a bird's wing muscles attach, thereby providing adequate leverage for flight. Keels do not exist on all birds; in particular, some flightless birds lack a keel structure.
The presence or absence of a pronounced keel structure was used as a broad classification of birds in two orders:-
CARINATAE ( from carina - "keel") and RATITES ( from ratis - "raft" referring to flatness of the sternum)
Having subtle keel structure or lacking one entirely . However , This classification has fallen into disuse as evolutionary studies have shown that many flightless birds have evolved from fliighted birds .
The current definition of carinatae now includes all extant birds.
hope it helps u ^_^
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Carinatae is the group of all birds and their extinct relatives to possess a keel on the underside of the breastbone which is used to anchor large flight muscles. The most primitive known bird relative with a keeled breastbone is Confuciusornis. While some specimens of this stem-bird have flat breastbones, some show a small ridge that could have supported a cartilaginous keel.
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