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):

Segmented Worms Leeches (Phylum Annelida, Class Hirundinea):

(Phylum Annelida, Class Oligochaeta):

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

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

Insects (Phylum Arthropoda, Class Insecta)

Hymenoptera: Formicidae Collembola

Ants Springtails

Coleoptera Coleoptera

Beetles (grubs) Beetles (adults)

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

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

LINEAR TRANSECT:

DEPTH PROFILE:

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: ___________________________________________________________