File:Protovsdeuterostomes.svg

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Descreeption
English: This diagram is showing the difference of the two major types of coelomates: the protostomes (molluscs, annelids, arthropods, ...) and deuterostomes (echinoderms, vertebrates, ...). These groups differ in several characteristics of early development; In deuterostomes blastula divisions is called "radial cleavage" 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 gastrulation, protostomes embryos' mouth was given first by the blastopore while the anus was formed later and vice versa for the deuterostomes. As examples :
  • Squids are protostomes.
    Squids are protostomes.
  • Sea urchins are deuterostomes.
    Sea urchins are deuterostomes.
Date
Soorce Ain wirk
Author WYassineMrabet✉
Permission
(Reuisin this file)		 GFDL and CC-BY-SA (see below)
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Protovsdeuterostomes-de.svg
Deuterostomes.png
Protostomes.png
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Date/TimeThummnailDimensionsUiserComment
current10:22, 17 October 2009Thumbnail fer version aes o 10:22, 17 October 2009577 × 527 (1.31 MB)YassineMrabetfixing error : <s>coelome</s> coelum
16:24, 14 October 2009Thumbnail fer version aes o 16:24, 14 October 2009577 × 527 (1.31 MB)YassineMrabet{{Information |Description={{en|1=This diagram is showing the difference of the two major types of coelomates: the protostomes (molluscs, annelids, arthropods, ...) and deuterostomes (echinoderms, vertebrates, ...). T

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