Bradabyssa Hartman 1967

Key to species groups of Bradabyssa Hartman, 1967

1 Dorsal papillae not visible; sediment particles fused into crusts, covering papillae completely............ group “crustosa”

- Dorsal papillae visible; sediment particles, if any, not completely covering papillae................................. 2

2(1) Dorsal papillae without sediment cover, or sediment forming very thin layers; papillae tiny or forming tubercles..................................................................................................... group “ nuda ”

- Dorsal papillae with sediment cover, at least basally; tubercles present or absent.................................... 3

3(2) Body papillae small, often with long tip.........................................................group “ villosa ”

- Body papillae large, often transformed into tubercles, all of similar size, or in two markedly different sizes. group “ verrucosa ”