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