| 1. | It is no longer translucent but is covered in short setae.
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| 2. | The tibia is frequently composed of short, closely set setae.
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| 3. | Setae black with white spots in front of the dorsolateral tubercles.
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| 4. | The setae on the ventral margin of the mandibles are normal.
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| 5. | Compared with other annelids, echiurans have relatively few setae.
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| 6. | The body of the labial palps bearing 6 or 7 major setae.
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| 7. | Certain species have distinctive tufts of setae extending from their posterior end.
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| 8. | Their long setae also serve to stem convective heat loss.
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| 9. | The setae of this species have a uniformly rusty appearance.
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| 10. | Setae are as varied in form and function as appendages.
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