| 1. | It is also without a collar-like structure around the peristomium.
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| 2. | Its peristomium is small and short, covering the posterior prostomium margin.
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| 3. | Its peristomium shows a dorsal fold partly covering the prostomium.
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| 4. | Its peristomium is shorter than the segments that succeed it, being bilobed.
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| 5. | Its peristomium measures the same as its succeeding segments.
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| 6. | It is characterised by possessing a long biannulate peristomium and fibrillated capillary setae.
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| 7. | Its peristomium is similar to the segments that succeed it, being somewhat bilobed.
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| 8. | Its peristomium measures the same as its succeeding segments, covering the posterior half of the prostomium.
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| 9. | Prostomium rectangular shaped with two lateral horns making it appear as a " T . peristomium " without chaetae.
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| 10. | It carries two ciliated nuchal organs between its prostomium and peristomium, the latter being similar in length to the adjacent segments.
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