| The scientific name for this kind of mouth segment is a prostomium, Jacobs explains. |
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| The prostomium is conical and shorter or equal to its base at the peristomium. |
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| Descriptions of this species, prostomium elongate are rounded anteriorly, flanked laterally by peristomial ridges leading to ventral mouth. |
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| Morphologically, it is characterized by a blunt prostomium forming a hood over its mouth. |
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| The specific name naso is a noun derived from the Latin word nasus and the Roman personal name Naso, emphasizing the nose-like prostomium of this worm. |
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| The shell-boring polychaete species were identified on the basis of fifth setiger chaetae, prostomium and pygidium morphology, and branchiae distribution. |
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| Prostomium anteriorly rounded, posteriorly extending to chaetiger. |
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