Type species: Arachnoidea annosciae d'Hondt & Geraci, 1976
Gordon (1986) proposed that Arachnoidella be raised to generic status to include the marine species formerly assigned to Arachnoidea.
This genus includes the species:
| Arachnoidella annosciae | (d'Hondt & Geraci, 1976) | Recent | Mediterranean |
| Arachnoidella barentsia | (Kluge, 1962) | Recent | Arctic |
| Arachnoidella brevicaudata | (d'Hondt & Mawatari, 1987) | Recent | Japan |
| Arachnoidella dubia | (d'Hondt, 1975) | Recent | North Atlantic |
| Arachnoidella echinophilia | Gordon, 1986 | Recent | New Zealand |
| Arachnoidella evelinae | (Marcus, 1937) | Recent | Brazil |
| Arachnoidella ophiomorpha | (d'Hondt & Mawatari, 1987) | Recent | Japan |
| Arachnoidella prenanti | (d'Hondt, 1975) | Recent | NE Atlantic |
| Arachnoidella protecta | (Harmer, 1915) | Recent | Indonesia |
| Arachnoidella thalassae | (d'Hondt, 1979) | Recent | North Atlantic |
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