Evo jednog zanimljivog i jednostavnog
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The ancestral amphibians had a rather weak skull and paired "aortas" (systemic arches).
The first reptiles immediately split into two major lines which modified these traits in different ways. One line developed an aorta on the right side and
strengthened the skull by swinging the quadrate bone down and forward, resulting in an enormous otic notch (and allowed the later development of good hearing without much further modification). This group further split into three major groups, easily recognizable by the number of holes or "fenestrae" in the side of the skull: the anapsids (no fenestrae), which produced the turtles; the diapsids (two fenestrae), which produced the dinosaurs and birds; and an offshoot group, the eurapsids (two fenestrae fused into one), which produced the ichthyosaurs.
The other major line of reptiles developed an aorta on left side only, and strengthened the skull by moving the quadrate bone up and back, obliterating the otic notch (making involvement of the jaw essential in the later development of good hearing). They developed a single fenestra per side. This group was the synapsid reptiles. They took a radically different path than the other reptiles, involving homeothermy, a larger brain, better hearing and more efficient teeth. One group of synapsids called the "therapsids" took these changes particularly far, and apparently produced the mammals.
Ovdje ti priča o razvoju aorti i ojačanju lubanje kod prijelaza između vodozemaca i reptila,
povećanje mozga i zuba.
Jebiga znam da je na engleskom, ali mi se stvarno ne da prevoditi.
A gomile materijala na engleskom.