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| Figure 8: Hemichordates and a planctosphere (with approximate lengths). A, B, Saccoglossus (Hemichordata, Enteropneusta): A, adult (1.5 m); B, tornaria larva (3 mm). C, D, Rhabdopleura (Hemichordata, Pterobranchia): C, adult (0.5 mm); D, larva (0.4 mm). E, Planctosphaera (Planctosphaeromorpha) (25 mm). |
