Cladocera Daphnia, water flea
Copepods Calanoid Harpracticoid Cyclopoid
Freshwater Plankton Classifications with Bolting Cloth Sizes. µm size. Inch size. Silk size. Plankton Classification. 1, XX. Largest zooplankton & ichthyoplankton XX. Larger zooplankton & ichthyoplankton Large zooplankton & ichthyoplankton XX. Medium zooplankton & ichthyoplankton Large microcrustacea Microcrustacea Microcrustacea & most rotifers No definition Net phytoplankton & Net zooplankton Large nannoplankton none. Small nannoplankton.
Group. Size range. Megaplankton. > 2×10−2 m. (20+ mm) metazoans; e.g. jellyfish; ctenophores; salps and pyrosomes (pelagic Tunicata); Cephalopoda. Macroplankton. 2×10−3→2×10−2 m. (2–20 mm) metazoans; e.g. Pteropods; Chaetognaths; Euphausiacea (krill); Medusae; ctenophores; salps, doliolids and pyrosomes (pelagic Tunicata); Cephalopoda. Mesoplankton. 2×10−4→2×10−3 m. (0.2 mm-2 mm) metazoans; e.g. copepods; Medusae; Cladocera; Ostracoda; Chaetognaths; Pteropods; Tunicata; Heteropoda. Microplankton. 2×10−5→2×10−4 m. ( µm) large eukaryotic protists; most phytoplankton; Protozoa (Foraminifera); ciliates; Rotifera; juvenile metazoans - Crustacea (copepod nauplii) Nanoplankton. 2×10−6→2×10−5 m. (2-20 µm) small eukaryotic protists; Small Diatoms; Small Flagellates; Pyrrophyta; Chrysophyta; Chlorophyta; Xanthophyta. Picoplankton. 2×10−7→2×10−6 m. (0.2-2 µm) small eukaryotic protists; bacteria; Chrysophyta. Femtoplankton. < 2×10−7 m. (< 0.2 µm) marine viruses.
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