Nereis oligohalina. Neotype female A–G (ECOSUR 0172); paraneotypes H–O (ECOSUR 0173). A Anterior end, dorsal view B Posterior end, dorsal view C Parapodium 2, anterior view D Parapodium 10, anterior view E Parapodium 46, anterior view F Parapodium 64, anterior view G Left jaw, dorsal view H Supra-acicular homogomph spiniger, parapodium 40 I Sub-acicular heterogomph spiniger, from same J Supra-acicular homogomph spiniger, from same K Notopodial homogomph falciger, from same L Supra-acicular heterogomph falciger, parapodium 28 M Sub-acicular heterogomph falciger, from same N Notopodial homogomph spiniger, parapodium 40 O Sub-acicular heterogomph spiniger, from same. Scale bars: 1 mm (A); 0.3 mm (B, G); 50 μm (C); 0.1 mm (D–F); 10 μm (H–M); 30 μm (N, O).