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. 2023 Oct 11;1182:35–134. doi: 10.3897/zookeys.1182.104258

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Robin S. Wilson, Christopher J. Glasby, Torkild Bakken

This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Figure 1. — Prostomium, pharynx A barrel-shaped palps (orange dashed outline) and palpophore surface with a single transverse groove (open arrow) Namalycastisabiuma LNG M16Q3 B subconical palps (orange dashed outline) and palpophore surface with several oblique grooves (filled arrows) Neanthesglandicincta MD165 anterior C caecal glands (filled arrows) in ventral dissection of PerinereisvallataNMV F108784 D spherical palpostyles (filled arrow) and prostomium with longitudinal groove (open arrow) NamalycastisabiumaE acutely conical palpostyles (filled arrow) and indented prostomium (open arrow) GymnonereisminyamiF prostomium anterior margin entire Nereis sp. G prostomium anterior margin indented (open arrow) Ceratonereis sp. H dentate jaws (filled arrow) PlatynereisbicanaliculataNTM W17252 I smooth/crenulate jaws (white arrow) LeonnatescrinitusNTM W3330 J everted pharynx a truncate cone with greatest width at margin of tentacular belt (= “frustrum-shaped”) Alitta sp. NMV F94547 K everted pharynx cylindrical SimplisetiaaequisetisNMV F94248 L ventral peristomial flap (filled arrows) and palpostyles subconical to oval-shaped (open arrow) CheilonereisperistomialisM ventrum of anterior chaetigers with rows of tubercles extending to the base of each neuropodium (filled arrows) AustralonereisehlersiN ventrum of anterior chaetigers smooth Neanthes sp. NMV F182608 O dorsal view pharynx with numbering following Kinberg PerinereisvallataP ventral view pharynx with numbering following Kinberg Perinereisvallata. Sources: A, B, F, H, I, M C. Glasby photographs C, J, K, N R. Wilson photographs D modified after C. Glasby (1999)E modified after Hutchings and Reid (1990)G Leon Altoff photograph L, O, P R. Wilson drawings. Not to scale; body widths of these example specimens are in the range 2–5 mm wide excluding parapodia.