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Head large relative to body
Rostrum usually long and acute
Adult body length generally greater than 1.25 mm
Head small relative to body with or without helmet (h)
Small rostrum (r)
Body length generally less than 1 mm
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Branchiopoda
Suborder Cladocera
Family Daphniidae
Genus Daphnia