Exogoninae (Polychaeta: Syllidae) from the Mexican Caribbean coast. A key to identify species from the Grand Caribbean Sea

The Exogoninae (Syllidae) family from the Mexican Caribbean coasts were identified and developed an identification key. The family classification and the Exogoninae composition are briefly examined; the correct names of the subfamilies are Syllinae, Eusyllinae, Autolytinae and Exogoninae includes Anguillosyllis, Brania, Braniella, Exogone, Exogonella, Exogonoides, Parapionosyllis, Psammosyllis, Spermosyllis and Sphaerosyllis. Pseudexogone, formerly included in the group, is not a syllid; it belongs to Pilargidae . 814 specimens belonging to 3 genera, 3 subgenera and 13 species as Brania (4), Exogone (4) and Sphaerosyllis (5); five new species are described: Brania russelli n. sp., Brania uebelackerae n. sp.., Brania westheidei n. sp., Exogone (Exogone) bondi n. sp., and Exogone (Parexogone) sanmartini n. sp.. For each species, selected references, diagnostic features, observations on morphological variability, distribution and illustrations are provided; new species also have an english diagnosis. Most abundant species were B. uebelackerae n. sp. (295), S. taylori (169), E. (E.) dispar (76), and E. (E.) bondi n. sp. (72).