Genus Sigambra Müller, 1858 Type species: Sigambra grubii Müller, 1858. Gender: male (original spelling). Diagnosis: (Salazar-Vallejo et al. 2019, emended.) Body depressed. Prostomium with three antennae, longer than palps; palps biarticulate. Tentacular cirri as long as half width of tentacular segment. Parapodia biramous. Dorsal and ventral cirri foliose to tapered, dorsal ones usually longer than ventral ones. Notopodia with dorsal hooks along numerous segments, sometimes with accessory capillaries. Neurochaetae flaưened capillaries of varying length oħen twisted distally, one edge finely denticulate; additional shorter pectinate chaetae present in some species. Remarks: The diagnosis by Salazar-Vallejo et al. (2019) is herein emended in order to include species without shorter pectinate chaetae (pectinates), which have not been observed in specimens of Sigambra magnuncus studied here. A most recent key to species of Sigambra, together with a synoptic table of characters for all 26 species currently accepted (Read and Fauchald 2022), is presented in Bhowmik et al. (2021).