Dichotomous Classification Keys Helping to place organisms in the appropriate classification group • A dichotomous classification key Specimen includes two choices for each characteristic Subgroup Subgroup #1 #2 Subgroup Subgroup Subgroup Subgroup #3 #4 #5 #6 Spider Key • One common mistake is the assumption that a particular species is actually included in the key. It is possible that a specimen can not be identified with that key. This may lead to an incorrect answer. • A dichotomous key alone should not be used to identify species.
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