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Biology LibreTexts

7.3: Lab 7 Assignment: Soil Arthropods

  • Page ID
  • Guide to Common Soil Arthropods                                           Name: __________________________

    PART I. Identification

    Mites (Class Arachnida, Order Acari):                               Round Worms (Phylum Nematoda):

    Mite-295x300.jpg                                                   Round-Worm-218x300.jpg

    Segmented Worms                                                               Leeches (Phylum Annelida, Class Hirundinea):

    (Phylum Annelida, Class Oligochaeta):

    Segmented-Worm-300x72.png                                                                        Leech-84x300.jpg

    Snails, Slugs (Phylum Mollusca, Class Gastropoda):           Isopod (Phylum Crustacea, Order Isopoda):

    Snail-300x136.jpg                                       Isopod-234x300.jpg

    Centipedes (Phylum Uniramia, Class Chilopoda):                 Millipedes (Phylum Uniramia, Class Diplopoda):

    Centipede-1024x347.jpg                     Millipede-267x300.jpg

    Insects (Phylum Arthropoda, Class Insecta)

    Hymenoptera: Formicidae                                                                  Collembola

    Ants                                                                                                          Springtails

    Ant-1024x530.jpg                            Collembola-202x300.jpg

    Coleoptera                                                                                                   Coleoptera

    Beetles (grubs)                                                                                           Beetles (adults)

    Grub-296x300.jpg                                          Beetle-173x300.jpg

    Additional, Morpho-species (draw and describe each of the “artificial” designations used in your data reporting):

    Data Collection

    Collection Site Name TAXA/Morpho-species TALLY TOTALS

    Part II. Soil Arthropods Study

    1. Report your results – major trends, morphological differences in guilds between samples, etc.



    1. Discuss your results – why did the arthropod assemblages vary as they did in your samples?

    Part III. Identification

    Create a Dichotomous Key for the organisms identified in your group samples: these are set up as couplets of two choices that are opposite. For example:

    1A. Shape does not have discernible “sides” …                                                  …CIRCLE

    1B. Shape has discernible sides …                                                                           … 2

    2A. Sides of shape are all of equal length…                                                           …3

    2B. Sides of shape are not all of equal length…                                                   …RECTANGLE

    3A. Shape has three sides …                                                                                     …TRIANGLE

    3B. Shape has four sides …                                                                                       …SQUARE

    Select SIX of the soil organisms you identified in this lab and create a dichotomous key that can be used to identify them.

    Key approved by: ___________________________________________________________