Photos scaled to size within each class, not overall.

Small - 0.5-1.0mm
to 1.0mm	Daphnia galeata (Male)	Photos scaled ~40x
to 1.0mm	Ceriodaphnia laticaudata (Female)
to 1.0mm	Ilyocryptus sordidus
to1.0mm	Alona affinis
to 1.0mm	Ceriodaphnia quadrangula (Female)
to 1.0mm	Camptocercus macrurus
to 1.0mm	Camptocercus rectirostris
to 1.0mm	Leydigia acanthocercoides
0.8-0.9mm	Diaphanosoma brachyurum (Female)
0.8-0.9mm	Ceriodaphnia lacustris (Female)
0.9mm (0.8-1mm)	Scapheloberis kingi
to 0.9mm	Alona quadrangularis
to 0.9mm	Leydigia leydigia
0.88mm (0.75-1.0mm)	Daphnia ambigua
0.88mm (0.75-1.0mm)	Daphnia parvula
0.8mm	Polyphemus pediculus (Male)
0.8mm	Diaphanosoma birgei (Male)
0.7mm (0.2-1.2mm)	Daphnia longiremis (Female)
to 0.8mm	Ilyocryptus spinifer
to 0.8mm	Wlassicsia kinistinensis
to 0.8mm	Pleuroxus striatus (Female)
to 0.8mm	Chydorus globosus (Female)
0.75mm (0.7-0.8mm)	Chydorus latus (Female)
0.7mm (0.4-1.0mm)	Alona costata
0.7mm (0.6-0.8mm)	Alonopsis elongata
to 0.7mm	Ceriodaphnia laticaudata (Male)
to 0.7mm	Drepanothrix dentata
to 0.7mm	Ilyocryptus acutifrons
0.65mm (0.4-0.9mm)	Acroperus harpae
0.6mm (0.2-1.0mm)	Daphnia longiremis (Male)
0.6mm (0.5-0.7mm)	Macrothrix laticornis
0.6mm (0.5-0.7mm)	Graptoleberis testudinaria
0.6mm (0.4-0.8mm)	Ceriodaphnia reticulata (Male)
0.6mm	Pleuroxus hastatus (Female)
to 0.6mm	Kurzia latissima
to 0.6mm	Pleuroxus aduncus (Female)
to 0.6mm	Pleuroxus striatus (Male)
to 0.6mm	Ceriodaphnia quadrangula (Male)
to 0.6mm	Chydorus globosus (Male)
0.55mm (0.4-0.7mm)	Ceriodaphnia pulchella (Female)
0.55mm (0.5-0.6mm)	Chydorus faviformis (Female)
0.55mm (0.5-0.6 mm)	Holopedium gibberum (Male)
0.55mm (0.5-0.6mm)	Pleuroxus denticulatus (Female)
0.55mm (0.5-0.6mm)	Moina micrura
By Family ... Chydoridae Daphnidae Holopedidae Macrothricidae Polyphemoidea Sididae Moina

Very Small - <0.5mm
to 0.5mm	Alona rectangula	Photos scaled ~70x
to 0.5mm	Alonella excisa
to 0.5mm	Pleuroxus procurvus
to 0.5mm	Ceriodaphnia pulchella (Male)
to 0.5mm	Chydorus gibbous (Female)
to 0.5mm	Rhynchotalona falcata
0.48mm (0.37-0.59)	Disparalona rostrata (Female)
0.45mm	Pleuroxus aduncus (Male)
0.45mm	Pleuroxus hastatus (Male)
0.45mm (0.4-0.5mm)	Monospilus dispar
0.4mm (0.2-0.6mm)	Bosmina longirostris (Female)
0.4mm (0.2-0.6)	Eubosmina coregoni (Female)
0.4mm (0.2-0.6)	Eubosmina coregoni (Male)
0.4mm	Alona circumfimbriata
0.4mm	Diaphanosoma brachyurum (Male)
<0.4mm	Alona guttata
0.39mm (0.38-0.40)	Disparalona rostrata (Male)
to 0.36mm	Pleuroxus denticulatus (Male)
0.35mm (0.2-0.5mm)	Bosmina longirostris (Male)
0.35mm (0.3-0.4mm)	Chydorus sphaericus (Female)
0.35mm	Anchistropus minor
0.31mm (0.22-0.4mm)	Disparalona acutirostris
to 0.28mm	Alonella nana
By Family ... Bosminidae Chydoridae Daphnidae Sididae

Photos Courtesy of:
Bio-DiTRL - University of Alberta
BioImages: The Virtual Field-Guide (UK). Cladocera.
Jerry Evans, CENTEX Naturalist
GLERL
KLS
Plankton-Gruppen
Taxonomy of Cladocera - Ruediger Rudolf
Southwest Missouri State University Zooplankton Project
UK-Microscopy
The Cladoceran Website - University of Guelph, Canada
Yokkaichi University
Zooplankton of the Great Lakes - Central Michigan University

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