Daphnia pulex Genome

"The water flea, Daphnia, represents a major taxonomic lineage of aquatic arthropod diversity. Colbourne et al. (p. 555; see the Perspective by Ebert) present Daphnia's tiny genome, which nevertheless contains a large inventory of genes with many duplicated genes and expanded gene families that lack homology to genes in other sequenced genomes."

Source: Science 4 February 2011