| 1. | Its peristomium is small and short, covering the posterior prostomium margin.
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| 2. | Its peristomium shows a dorsal fold partly covering the prostomium.
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| 3. | The head, or prostomium, is relatively well developed, compared with other annelids.
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| 4. | The prostomium generally has a proboscis, from which the genus has got its name.
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| 5. | The prostomium has two short frontal antennae, two globular palps and five main antennae.
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| 6. | Its prostomium has cirri, with simple supraacicular chaetae and compound subacicular chaetae with serrated blades.
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| 7. | The prostomium bears eyes, two pairs of antennae and a pair of large retractile nuchal organs.
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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. | Its proventricle is similar in length to the prostomium, spanning 3 segments, with about 18 muscle cell rows.
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| 10. | Prostomium rectangular shaped with two lateral horns making it appear as a " T . peristomium " without chaetae.
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