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Once this had appeared, the protostomes could develop.
Arthropods are bilaterally symmetrical protostomes with strongly segmented bodies.
In the complementary category, the protostomes , which includes annelids and arthropods, the blastopore develops into the mouth.
These animals are all protostomes - the mouth develops before the anus in the young embryo - and they have long been recognized as belonging together as a group.
If the ancestor of protostomes displayed a segmentation comparable to annelids and arthropods, this necessarily means that segmentation was lost independently in different protostome lineages.
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