BIOL 304 Lecture Notes - Lecture 33: Anomodont, Mandible, Confuciusornis
5 Mar 2018
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Document Summary
Exaptation, novelty & origin of birds and mammals. Adaptation: origin of features that increase the fitness of an individual; explained by natural selection; allele frequency differences. Novelty: origin of a trait that facilitates evolution of new variational opportunities within a lineage; explained by derived developmental features; novel genetic features. Archaeopteryx: (cid:862)first (cid:271)ird(cid:863) bird-like dinosaurs that is transitional between non-avian feathered dinosaurs and modern birds -> late jurassic. Braces shoulder jones and helps pump air into the lungs: also found in dinosaur skeletons. Sinosauropteryx: small body size was a re-invention -> dinos went from small birds to large dinos back to tiny dinos, this is an example of one, first feathered dinosaur found fossil found in 1996. Psittacosaurus sp: quill-like structures on the tail, could be that many other reptiles have quil-like feathers. Caudipteryx: tail feathers completely feather like, same as real flight feathers. If they could(cid:374)"t leap, the(cid:455) pro(cid:271)a(cid:271)l(cid:455) (cid:449)ould(cid:374)"t (cid:271)e a(cid:271)le to fl(cid:455)
