Taxonomic contribution to the genus Sphaerosyllis (Annelida: Syllidae: Exogoninae) in the Black Sea Martín, Guillermo San Zootaxa 2017 2017-10-05 4329 3 281 291 84TQW San Martin & Aguado 2014 [491,652,1800,1826] Polychaeta Syllidae Sphaerosyllis Animalia Phyllodocida 7 288 Annelida genus    1. Parapodial glands present...............................................................................2  - Parapodial glands absent................................................................................5   2. Dorsal cirri shorter than parapodial lobes, at least in anterior chaetigers.......................................... 3  - Dorsal cirri longer than parapodial lobes...................................................................4   3. Blades of falcigers strongly serrated, short (<9 µm); shafts with strong distal spines.................................. ..................................................................   Sphaerosyllis thomasi San Martín, 1984b- Blades of falcigers moderately serrated only in anterior and midbody dorsalmost chaetae; blades with slight dorso-ventral gradation but always longer than 9 µm; shafts smooth...................................   Sphaerosyllis pontica sp. nov.  4. Blades of falcigers without marked dorso-ventral gradation in length.................   Sphaerosyllis taylori Perkins, 1981  - Blades of falcigers with a marked dorso-ventral gradation in length (dorsalmost falcigers at least 1.5 times the length of ventral ones)................................................................   Sphaerosyllis hystrix Claparède, 1863    5. All parapodia with one straight acicula with subdistal enlargement; midbody parapodia with one enlarged modified chaetae lacking the blade.......................................................   Sphaerosyllis bulbosa  Southern, 1914  - Anterior parapodia with two aciculae each, one straight and one with tip bent at right angle; midbody parapodia with all heterogomph chaetae having blades...........................................   Sphaerosyllis pirifera Claparède, 1868 1661822841 Southern 8 289 1 Southern