Twenty-one species of the genera
Grubeosyllis Verrill, 1900, and
Exogone Örsted, 1845 (Exogoninae: Syllidae), principally from Cuba but also from the Gulf of Mexico, Florida and Puerto Rico are reported in this paper. The genus
Grubeosyllis is re-erected to replace
Pseudobrania San Martín, 1984, a junior synonym. The genus
Exogone is revised, three subgenera are proposed:
Exogone Örsted, 1845,
Parexogone Mesnil and Caullery, 1916, and
Sylline Claparède, 1864. Keys of each subgenus for the identification of all species described are given. The following new species are described:
Exogone (Parexogone) caribensis,
E. (P.) wolfi,
Exogone (Exogone) rolani,
E. (E.) longispinulata, and
E. (E.) pseudolourei. The species and subspecies
Grubeosyllis heterocirra (Rioja, 1941);
G. vieitezi (San Martín, 1984);
G. euritmica (Sardá, 1984);
Exogone (Parexogone) exmouthensis Hartmann-Schröder, 1980;
Exogone (Parexogone) parahomoseta mediterranea San Martín, 1984;
Exogone (Exogone) breviantennata Hartmann-Schröder, 1959; and
Exogone (Sylline) naidinoides Westheide, 1974, are new to the Caribbean and Gulf of Mexico area. The species
Grubeosyllis nitidula Verrill, 1900;
Grubeosyllis rugulosa Verrill, 1900;
Exogone (Parexogone) atlantica Perkins, 1981;
Exogone (Exogone) dispar (Webster, 1879);
E. (E.) lourei Berkeley and Berkeley, 1948; and
E. (E.) arenosa Perkins, 1981, are new to the Cuban fauna. The species
Grubeosyllis nitidula and
G. rugulosa are identified tentatively because there is doubt about their correct determination, and
G. nitidula is re-described on the bases of Cuban specimens. Two species of
Exogone (Exogone) have been identified only to subgenus.
