The morphological trait that shows the most variation among organisms exhibiting protostome development is the type of body cavity.
Protostomes are animals having bilateral symmetry in which the mouth is developed before the anus.
The organisms (protostomes) represent the main classification feature of animals according to the type of embryo development.
The genetic analysis of molecular sequences has shown that protostomes emerged first in the evolution in the animal kingdom.
Protostomes include diverse groups of animals such as annelids, nematodes, arthropods, mollusks, flatworms, etc.
In conclusion, the morphological trait that shows the most variation among protostomes is the type of body cavity.
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