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

Sigambra grubii topotype, small specimen (ECOSUR SEM P1) A anterior region, dorsal view B same, close-up of anterior end C right parapodium, median chaetiger, of larger specimen (6.5 mm long), anterior view (arrow points to gonopore) D same, pectinate chaetae E same, another parapodium, pectinate chaetae F same, posterior region, dorsal view (asterisk indicates last chaetiger with notohooks). Scale bars: 200 µm (A, F), 110 µm (B), 100 µm (C), 22 µm (D), 12 µm (E).