Four new Caribbean Sigambra species (Annelida, Pilargidae), and clarifications of three other Sigambra species

Sigambra grubii topotypes, large specimen (ECOSUR SEM P1) A anterior region, dorsal view B same, close-up of anterior end C another specimen, anterior end, frontal view D same, posterior region (asterisk indicates last chaetiger with notohooks) E specimen in A, median chaetigers (arrow points enlarged chaetae) F pectinate chaetae G same, detail showing bipinnate denticulation. Scale bars: : 280 µm (A), 250 µm (B), 170 µm (C), 110 µm (D), 230 µm (E), 8 µm (F), 2 µm (G).