Molluscs (A-26), which also have trochophore larvae, may have
evolved from annelid ancestors or from sipunculans; alternatively,
the trochophore larvae may have arisen independently, an
example of convergent evolution. Unlike wormlike nemertines
(A-10), nematodes (A-11), nematomorphs (A-12), and acanthocephalans
(A-13), annelids have linearly segmented bodies,
coeloms, a ventral nerve cord, and distinct eyes (in polychaetes).
Onychophorans (A-28) and annelids may have a common
ancestor. The phylogenetic relationship between annelids and
arthropods is currently controversial
Molluscs (A-26), which also have trochophore larvae, may have
evolved from annelid ancestors or from sipunculans; alternatively,
the trochophore larvae may have arisen independently, an
example of convergent evolution. Unlike wormlike nemertines
(A-10), nematodes (A-11), nematomorphs (A-12), and acanthocephalans
(A-13), annelids have linearly segmented bodies,
coeloms, a ventral nerve cord, and distinct eyes (in polychaetes).
Onychophorans (A-28) and annelids may have a common
ancestor. The phylogenetic relationship between annelids and
arthropods is currently controversial
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