Sigambra hernandezi sp. nov. A small specimen, dorsal view, body dehydrated B same, anterior end, oblique dorsal view C same, posterior region, dorsal view (asterisk indicates last chaetiger with hooks) D another specimen, anterior end, frontal view E another specimen, posterior region, dorsal view (asterisk indicates last chaetiger with hooks). largest specimen (UANL 5799) F Anterior region, dorsal view (asterisk indicates globular structures enlarged in C) G same, close-up of papillae series in tentacular segment H same, close-up of interramal globular structures, outer wall broken I left parapodia, chaetigers 11–16, oblique frontal view (asterisk indicates gonopore) J another specimen (UANL 4047), anterior end, oblique frontal view K same, posterior region, dorsal view (asterisk indicates last chaetiger with hooks). Scale bars: 150 µm (A), 80 µm (B, C), 140 µm (D), 170 µm (E), 330 µm (F), 90 µm (G), 60 µm (H), 200 µm (I), 220 µm (J), 140 µm (K).