File:Ancestors 2.gif
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Ancestors_2.gif (347 × 246 pixels, file size: 8.63 MB, MIME type: image/gif, looped, 438 frames, 31 s)
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Description & Sources
[edit]Continuity and derivations of life forms between sponge and man.
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Orientation : Inside / outside. First stage of polycellular organism.
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Swimming worm. Bilateral symmetry. Segmentation. First internal organs.
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Primitive Cephalochordata, formation of the spine. Differentiation of internal organs.
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Typical fish - Invention of bones and scales, the fins have complex musculation and articulations. The lateral fins will evolve to become limbs.
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The fins evolve to fleshy members. Apparition or differentiation of lungs? First land movements?
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Formation of the neck. Fingers appear - movement and prehension ability.
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Land conquest. Lungs are functional, but the animal is still water-dependent for reproduction. (this one should be a salamander, not a lizard, but the general outlook is OK)
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Dry skin and water-independence of Amniote. (this one should be a lizard, not a salamander, but the general outlook is OK)
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Hair and gestation invention. Primitive mammalia are but insect-eaters "hairy lizards"... this one's cute, isen't it?
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Living in trees, our ancestors gained an opposable thumb and binocular frontal vision.
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(I needed an intermediary picture for smoother transition, so...) Higher monkey - social interaction and communication probably increased at that time. Ability to awkwardly walk on two feet.
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(I needed yet another intermediary picture for smoother transition, sorry) Our nearest cousin - lost its tail, by the way.
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Vertical position frees the brain and the hand.
Summary
[edit]DescriptionAncestors 2.gif | Evolution line from sponge to man |
Date | |
Source | Own work |
Author | Michelet-密是力 (talk) |
Other versions |
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current | 20:06, 3 January 2009 | 347 × 246 (8.63 MB) | Micheletb (talk | contribs) | {{Information |Description= Evolution line from sponge to man |Source= own work |Date= 1 january 2007 |Author= Michelet-密是力 (<span class="signature-talk">talk</span>) |Permission= |other_versions= }} [[Cate |
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