Adapted from Lesser Known Protostome Phyla. SICB 2001. J.R. Garey. . . Possess trochophore larvae. Mollusca and Annelida are closely allied phyla . Phylum Annelida: 12,500 spp: 3 classes = Class Polychaeta (8000 spp)Class Clitellata; subclass Oligochaeta (3500 spp)subclass Hirudinea (630 spp).
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