File:Protovsdeuterostomes.svg
Summary
This diagram is showing the difference of the two major types of coelomates: the <a href="https://en.wikipedia.org/wiki/protostomes" class="extiw" title="w:protostomes">protostomes</a> (molluscs, annelids, arthropods, ...) and <a href="https://en.wikipedia.org/wiki/deuterostomes" class="extiw" title="w:deuterostomes">deuterostomes</a> (echinoderms, vertebrates, ...). These groups differ in several characteristics of early development; In deuterostomes blastula divisions is called "<a href="https://en.wikipedia.org/wiki/radial_cleavage" class="extiw" title="w:radial cleavage">radial cleavage</a>" because it occurs parallel or perpendicular to the major polar axis. In protostomes the cleavage is called "spiral" because division planes are oriented obliquely to the polar major axis. During <a href="https://en.wikipedia.org/wiki/gastrulation" class="extiw" title="w:gastrulation">gastrulation</a>, protostomes embryos' mouth was given first by the <a href="https://en.wikipedia.org/wiki/blastopore" class="extiw" title="w:blastopore">blastopore</a> while the anus was formed later and vice versa for the deuterostomes. As examples :
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<a href="//commons.wikimedia.org/wiki/File:Loligo_vulgaris.jpg" class="image"><img alt="" src="https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Loligo_vulgaris.jpg/120px-Loligo_vulgaris.jpg" width="120" height="90" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Loligo_vulgaris.jpg/180px-Loligo_vulgaris.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Loligo_vulgaris.jpg/240px-Loligo_vulgaris.jpg 2x" data-file-width="2400" data-file-height="1800"></a>
Squids are protostomes.
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<a href="//commons.wikimedia.org/wiki/File:SeaUrchin.jpg" class="image"><img alt="" src="https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/SeaUrchin.jpg/90px-SeaUrchin.jpg" width="90" height="120" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/SeaUrchin.jpg/135px-SeaUrchin.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/SeaUrchin.jpg/180px-SeaUrchin.jpg 2x" data-file-width="1704" data-file-height="2272"></a>
Sea urchins are deuterostomes.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:36, 4 January 2017 | | 577 × 527 (1.31 MB) | 127.0.0.1 (talk) | This diagram is showing the difference of the two major types of coelomates: the <a href="https://en.wikipedia.org/wiki/protostomes" class="extiw" title="w:protostomes">protostomes</a> (molluscs, annelids, arthropods, ...) and <a href="https://en.wikipedia.org/wiki/deuterostomes" class="extiw" title="w:deuterostomes">deuterostomes</a> (echinoderms, vertebrates, ...). These groups differ in several characteristics of early development; In deuterostomes blastula divisions is called "<a href="https://en.wikipedia.org/wiki/radial_cleavage" class="extiw" title="w:radial cleavage">radial cleavage</a>" because it occurs parallel or perpendicular to the major polar axis. In protostomes the cleavage is called "spiral" because division planes are oriented obliquely to the polar major axis. During <a href="https://en.wikipedia.org/wiki/gastrulation" class="extiw" title="w:gastrulation">gastrulation</a>, protostomes embryos' mouth was given first by the <a href="https://en.wikipedia.org/wiki/blastopore" class="extiw" title="w:blastopore">blastopore</a> while the anus was formed later and <i>vice versa</i> for the deuterostomes. As examples : <center> <ul class="gallery mw-gallery-traditional"> <li class="gallerybox" style="width: 155px"><div style="width: 155px"> <div class="thumb" style="width: 150px;"><div style="margin:30px auto;"><a href="//commons.wikimedia.org/wiki/File:Loligo_vulgaris.jpg" class="image"><img alt="" src="https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Loligo_vulgaris.jpg/120px-Loligo_vulgaris.jpg" width="120" height="90" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Loligo_vulgaris.jpg/180px-Loligo_vulgaris.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Loligo_vulgaris.jpg/240px-Loligo_vulgaris.jpg 2x" data-file-width="2400" data-file-height="1800"></a></div></div> <div class="gallerytext"> <p>Squids are protostomes. </p> </div> </div></li> <li class="gallerybox" style="width: 155px"><div style="width: 155px"> <div class="thumb" style="width: 150px;"><div style="margin:15px auto;"><a href="//commons.wikimedia.org/wiki/File:SeaUrchin.jpg" class="image"><img alt="" src="https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/SeaUrchin.jpg/90px-SeaUrchin.jpg" width="90" height="120" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/SeaUrchin.jpg/135px-SeaUrchin.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/SeaUrchin.jpg/180px-SeaUrchin.jpg 2x" data-file-width="1704" data-file-height="2272"></a></div></div> <div class="gallerytext"> <p>Sea urchins are deuterostomes. </p> </div> </div></li> </ul> </center> |
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