Spirobranchus, Blainville, 1818

Brandão, Ivison Cordeiro & Brasil, Ana Claudia dos Santos, 2020, On a new species of Spirobranchus Blainville, 1818 (Annelida: Serpulidae) and considerations on the genus along the Brazilian coast, Papéis Avulsos de Zoologia 60, pp. 1-17 : 14-15

Key for the species of Spirobranchus recorded in Brazil

1. Radiolar lobes forming 2-8 whorls in spiral .......................... S. giganteus

1’. Radiolar lobes in 1 whorl or semicircular ...............................................2

2. Spirobranchus - type chaetae present...................................... S.tetraceros

2’. Collar chaetae all limbate or absent.......................................................3

3. Operculum with flat or convex,bilobed endplate;ocelli or ocelar clusters absent on radioles;tube with 3 keels and alveoli................. S.minutus

3’. Operculum with concave, funnel-shape endplate; paired ocelar clusters present on radioles;tube with1 pointed keel and transversal ridges... ................................................................................ S.lirianeae sp.nov.