File:Ancestors.gif
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Ancestors.gif (347 × 246 pixels, file size: 8.63 MB, MIME type: image/gif, looped, 438 frames, 31 s)
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Description & Sources
Continuity and derivations of life forms between sponge and human male.
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Orientation : Inside / outside. First stage of poly-cellular 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 insect-eaters and are basically "hairy lizards"... this one's cute, isn'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 hands. Brain volume increases, and larger in proportion to total body volume. Loss of body hair around the same time as clothing invented.
Summary
DescriptionAncestors.gif | Evolution line from sponge to man |
Date | |
Source | Own work |
Author | Michelet-密是力 (talk) |
Other versions |
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Licensing
I, the copyright holder of this work, hereby publish it under the following licenses:
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
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Items portrayed in this file
depicts
1 January 2007
image/gif
fc0f928c6b6403fbf96c0c7de0159d4ecd82c359
9,052,722 byte
31.219999999999825 second
246 pixel
347 pixel
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:08, 3 January 2009 | 347 × 246 (8.63 MB) | wikimediacommons>Micheletb | Final pause |
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