Ctenodrilidae

Magalhães, Wagner F., Bailey, Julie H., Brock, - & Davenport, Jennifer S., 2011, On the genus Raphidrilus Monticelli, 1910 (Polychaeta: Ctenodrilidae) with description of two new species, Zootaxa 2804, pp. 1-14 : 3

Key to genera of Ctenodrilidae (After Petersen & George 1991 and Dean 1995)

1A With long bodies (up to c. 35 segments); with filamentous branchiae (subfamily Raphidrilinae )...................... 2A

1B With short bodies (up to c. 15 segments); without branchiae (subfamily Ctenodrilinae )............................. 3A

2A Anterior segments distinct dorsally; 1–2 anterior and dorsally biannulate achaetous segments; indistinct posterior end; serrated capillaries throughout.......................................................................... Raphidrilus

2B Anterior segments indistinct dorsally; distinct posterior end with 1–2 modified posterior segments; chaetae may include serrate and coarsely serrate capillaries, pectinate falcigers, and simple curved spines............................... Raricirrus

3A All chaetae coarsely serrate..................................................................... Ctenodrilus

3B With capillaries in addition to serrate forms...................................................... Aphropharynx