Phylum Nemertea (Rhynchocoela)
Phylum Nemertea (Rhynchocoela)
Phylum Nemertea (Rhynchocoela)
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1. Proboscis<br />
2. Body wall architecture (3 types of muscles)<br />
3. Indirect development, free-living larvae<br />
4. Movement of the mouth anterior to the cerebral ganglion<br />
5. Movement of the longitudinal nerve cords to a mesenchymal position<br />
6. Fusion of the proboscis pore with the buccal region<br />
7. Proboscis armature<br />
8. Division of proboscis into distinct regions<br />
9. Reduction of sensory organs<br />
10. Appearance of posterior suckers<br />
11. Elongation and coiling of the gut<br />
12. Loss of intestinal diverticula<br />
<strong>Nemertea</strong>n Phylogeny
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