1. Plankton

2. Definition…

3. Diatoms

4. Green Algae: Chlorophytes

8. Zooplankton

9. Cladocera
Daphnia, water flea

10. Bosmina
Leptodora

11. Copepods
Calanoid
Harpracticoid
Cyclopoid

12. Copepod Nauplius

15. Rotifers

16. Plankton Nets

17. Net Size Classifications
Freshwater Plankton Classifications with Bolting Cloth Sizes
µm size
Inch size
Silk size
Plankton Classification
1,000
0.0394
000 XX
Largest zooplankton & ichthyoplankton
750
0.0295
00 XX
Larger zooplankton & ichthyoplankton
600
0.0236
-----
Large zooplankton & ichthyoplankton
560
0.0220
0 XX
Medium zooplankton & ichthyoplankton
363
0.0143 2
Large microcrustacea
243
0.0096 6
Microcrustacea
153
0.0060 10
Microcrustacea & most rotifers
118
0.0046 12
No definition 80
0.0031 20
Net phytoplankton & Net zooplankton 63
0.0024 25
Large nannoplankton
0.0004
none
Small nannoplankton

18. Plankton Size Cagetgories
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