4The Protostome-Deuterostome Split
The coelomate phyla can be divide into two distinct evolutionary lines. Mollusks, annelids, arthropods, and several other phyla represent one of these lines and are collectively called protostomes. Echinoderms, chordates, and some other phyla, collectively called deuterostomes, represent the other line. Protostomes and deuterostomes are distinguished by several fundamental differences in their development.
4The Protostome-Deuterostome SplitThe coelomate phyla can be divide into two distinct evolutionary lines. Mollusks, annelids, arthropods, and several other phyla represent one of these lines and are collectively called protostomes. Echinoderms, chordates, and some other phyla, collectively called deuterostomes, represent the other line. Protostomes and deuterostomes are distinguished by several fundamental differences in their development.
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