Protovsdeuterostomes.svg
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Summary
Description Protovsdeuterostomes.svg |
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 :
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Source | Own work | ||||||||||||||||||||||||
Author | W YassineMrabet ✉ | ||||||||||||||||||||||||
Permission
( Reusing this file ) |
GFDL and CC-BY-SA (see below) | ||||||||||||||||||||||||
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