Guide to Identification of Fresh Water                       Microorganisms        Microscopic autotrophic organisms (i.e....
Protozoa – heterotrophic only   Name          Picture                  Characteristic            Taxonomy                 ...
1. mostly free                                 living forms                              2. cell of fixed                 ...
Other fresh water plankton (Animalia, Monera, etc)     Name                     Picture    Characteristic          Taxonom...
1. moves in rapid                                 “s” form                              2. round bodyRoundworms           ...
Arthropods - segmented, exoskeletons   Name                  Picture   Characteristic            Taxonomy                 ...
1. two jointed tailsStonefly                                    (cerci)              Class Insectanymph                   ...
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Plankton

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Plankton

  1. 1. Guide to Identification of Fresh Water Microorganisms Microscopic autotrophic organisms (i.e. algae) Name Picture Characteristic TaxonomyGreen algae Phylum 1. flagella(with Chlorophyceae 2. smallflagella, i.e. 3. solitarysmall) Chlamyolomonas 4. rapid movement<.05 mm sp.Green algae 1. spherical Phylum(with 2. colonial Chlorophyceaeflagella) 3. with two flagella i.e. Volvox sp..5-2mm 1. spherical toGreen algae conical Phylum(no flagella) 2. not attached to Chlorophyceae <.5 mm surface i.e. Pediastrum sp. 3. no movementFilamentous 1. non branching Phylumgreen algae 2. chains of cells Gamophyceae<.1 mm – with chloroplast i.e. Zygnema sp.cms 3. no flagella Spirogyra sp. 1. green 2. no flagella Phylum 3. mainly solitary,Desmids Gamophyceae some colonial<.5 mm i.e. Desmidium sp 4. various shapes Closterium sp. 5. two semi-cell, mirror image 1. one cell 2. slow gliding motion PhylumDiatoms 3. solitary or Bacillariophyceae<.5 mm colonial i.e. Pennales, 4. cell wall Centric (frustules) made of silicaMath/Science Nucleus © 2004 1
  2. 2. Protozoa – heterotrophic only Name Picture Characteristic Taxonomy 1. one or more flagellaFlagellates 2. colonial or free Zoomastigophora<.5mm living i.e choanoflagellates 3. with or without lorica 1. pseudopodia SacrodinaAmoeba 2. slow movement Order Amoebina.02 –5 mm 3. engulfs food i.e. Amoeba proteus 1. amoeba with aShelled shell, usually SacrodinaAmoeba sand grains Order Testacea.1-.4 mm 2. pseudopodia i.e Arcella sp. 3. slow movement 1. sphericalHeliozoans 2. radiating hair Sacrodina.01-1 mm like pseudopods Order Heliozoea 3. no movement 1. cylindrical or bell shaped bodiesCiliates – 2. undulating cilia CiliophoraPeritrich 3. some stalked Order Peritrichida< .25 mm 4. often colonial i.e. Vorticella sp. 5. attached to different substrate 1. no cilia, stickyCiliates – tentacles CiliophoraSuctoria some attached to Order Eridogenida<.7 mm other organisms i.e. Tokophyra sp. (i.e. Suctoria)Math/Science Nucleus © 2004 2
  3. 3. 1. mostly free living forms 2. cell of fixed CiliophoraCiliates shape OrderParamecium 3. movement by Oliogohymenophorea.01 – 4mm contraction and i.e. Paramecium sp use of cilia 4. fixed mouth and anal pore 1. large bodyCiliates Ciliophora 2. contractileStentor Orer Heterotrichea 3. cilia on mouth.01 – 4 mm i.e. Stentor sp. end 1. barrel-shapedCiliates 2. spinous CiliophoraColeps projection at Order Prostomatea.01-4mm posterior end i.e. Coleps sp. 3. cytosome apicalMath/Science Nucleus © 2004 3
  4. 4. Other fresh water plankton (Animalia, Monera, etc) Name Picture Characteristic Taxonomy 1. blue green color KingdomBlue-green 2. gliding Moneraalgae movement i.e. Annabella(cyanobacteria) 3. prokaryote sp. 1. sometimes PhylumEuglenoids green Euglenida<.4mm 2. flagellate i.e. Euglena sp. 3. red eye spot 1. free swimming 2. tough armorDinoflagellates Phylum 3. flagellate<.4mm Dinoflagellate 4. autotrophic, heterotrophic 1. corona with cilia 2. hairy appendages Phylum Rotifer 3. transparent with ClassRotifers lorica Bdelloided.4mm - 2 cm 4. free swimming Class or attached Monogononta 5. organs, compressed body 1. green brown or colorless 2. body and PhylumHydra tentacles Cnidaria2 cm contract and i.e. Hydra sp. stretch 3. primitive organs Phylum 1. flattened PlatyhelminthesFlatworms 2. eye spots Class1-15+ mm 3. move in gliding Turbellaria motion i.e. Planaria sp.Math/Science Nucleus © 2004 4
  5. 5. 1. moves in rapid “s” form 2. round bodyRoundworms Phylum 3. bilateral.2-10 mm Nematodes 4. anterior, posterior openings 1. segmented PhylumOligochaetes 2. worm motion Annelida1.5 mm - >2 3. hair bundles Classcm (setae) Oligochaeta 1. predatory or PhylumLeeches parasitic Annelida> 1 cm 2. terminal suckers Class Hirudinea 3. hermaphroditic 1. mainly benthic Phylum 2. head bristles GastrotrichaGastrotricha 3. eat algae, Order.1-1.5mm bacteria, Chaetonotida protozoa 1. head and 4 trunkTardigrades segmentsLittle water Phylum 2. 4 pair legsbears Tardigrada 3. eyes< 1 mm 4. herbivoresMath/Science Nucleus © 2004 5
  6. 6. Arthropods - segmented, exoskeletons Name Picture Characteristic Taxonomy Class 1. bean-like shell CrustaceaOstracods 2. filter feeders Order<2mm 3. bivalve Ostracoda carapace i.e. Cypris sp. Class 1. long antennaeCopepods Crustacea 2. tiny eyespot.5-3mm Order 3. holoplankton Copepoda 1. antennae Class 2. large compound CrustaceaWater fleas eye Order.3-10mm 3. holoplankton Cladocera i.e. Daphnia sp 1. flattened ClassIsopods 2. 7 pairs legs Crustacea5-20mm 3. scavengers Order Isopoda 1. curved Class 2. compressedAmphipods Crustacea body5-25mm Order 3. humped back Amphipoda 4. scavengers 1. 8 legs 2. round bodyWater Class 3. larvaemites Arachnida (parasitic).5-5mm Order Acarina 4. nymph looks like adult 1. one tail Class InsectaAlderfly 2. long filaments Ordernymph along the Megaloptera5-25mm abdomen Family Sialidae 3. meroplankton 1. cylindrical caseCaddisfly for protection Class Insectalarva 2. distinct case but Order3-40mm different Trichoptera materialsMath/Science Nucleus © 2004 6
  7. 7. 1. two jointed tailsStonefly (cerci) Class Insectanymph 2. carnivorous Order<15 mm 3. indicates clean Plecoptera water 1. three jointedMayfly Class Insecta tailsnymph Order 2. leaf-like gills on<15mm Ephemeroptera sides 1. three leaf likeDamselfly Class Insecta tail appendagesNymph Order Odonata (gills)<15mm Zygoptera 2. extendable jaws 1. robustDragonfly Class Insecta 2. no tailnymph Order Odonata appendages<15mm Anisoptera 3. extendable jawsWater Class Insecta 1. no jawsboatman Order 2. tube-like beaknymph.and Hemiptera 3. nymphs don’tadult Family have wings10-15mm Corixidae 1. strong jaws 2. tough shield 3. fierce predator Class InsectaWater adult Orderbeetle 1. strong jaws Coleoptera<45mm 2. long segmented Family Elmidae body 3. short legs nymph 1. long slenderMosquito body Class Insectalarva 2. moves in Order Diptera1-20 mm undulating s curves Drawings redrawn from http://www.microscopy-uk.org.uk/pond/index.htmlMath/Science Nucleus © 2004 7

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