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7.3: Lab 7 Assignment- Soil Arthropods

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    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: ___________________________________________________________

    This page titled 7.3: Lab 7 Assignment- Soil Arthropods is shared under a CC BY-NC 4.0 license and was authored, remixed, and/or curated by Melissa Scherr and Gail Langellotto (OpenOregon) via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.