| 1 | Antennae, tentacular and dorsal cirri club-shaped. Trepan with 16–28 teeth. Chaetigers 1–4 with both unidentate and bidentate chaetae | Procerastea halleziana Malaquin, 1893 (1, 5) |
| – | Antennae, tentacular and dorsal cirri cylindrical. Trepan with 6–10 teeth. Chaetigers 1–4 with bidentate chaetae only | Procerastea nematodes Langerhans, 1884 (1, 5) |
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