| 1. | In most species the head is antennae is reduced and unsegmented.
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| 2. | This tissue derives from the unsegmented paraxial mesoderm and prechordal mesoderm.
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| 3. | Likely, the axial skeleton consisted of an unsegmented notochord.
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| 4. | The rays are unsegmented lepidotrichia, resulting in a rather stiff structure.
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| 5. | The cerci are unsegmented and modified into large, forceps-like structures.
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| 6. | In contrast, all modern mymarids have unsegmented palpi.
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| 7. | They have no carapace or limbs, having only unsegmented sac-like bodies.
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| 8. | It is a cylindrical, unsegmented worm with a crown of tentacles around the mouth.
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| 9. | "P . hermaphrodita " is unsegmented, vermiform, bilateral symmetrical pseudocoelomate.
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| 10. | In modern forms, the whole of the opisthosoma is fused into a single unsegmented structure.
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