''Pseudopenilia bathyalis'' is a species of

diplostraca The Diplostraca or Cladocera, commonly known as water fleas, are a superorder of small crustaceans that feed on microscopic chunks of organic matter (excluding some predatory forms). Over 1000 species have been recognised so far, with many more ...

n, described in 2004, that lives at depths of in the anoxic zone of the

Black Sea The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Roma ...

. Originally described in the family

Sididae Sididae is a family of ctenopods in the order Diplostraca. There are about 6 genera and at least 20 described species in Sididae. Genera * ''Diaphanosoma ''Diaphanosoma'' is a genus of '' Sididae''. The genus was described in 1850 by Fischer. ...

, it was transferred to its own family, the Pseudopenilidae, in 2008.

References

Cladocera Monotypic arthropod genera Branchiopoda genera {{Branchiopoda-stub