Invertebrate Identification using a Dichotomous key

Invertebrate Identification using a Dichotomous key -...

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Anthony Cavallaro Biology 108 - Section 4 Key to Major Invertebrate Phyla 1a. Animal with jointed legs…………………………………………Phylum Arthropoda…. .…2 1b. Animal without jointed legs (but may have stubby, unjointed legs)…………………………5 2a. Has 3 pairs of legs…………………………. ..……Class Insecta; Order Hemiptera; true bugs 2b. Has more than 3 pairs of legs………………………………………………. ..………………3 3a. Has 4 pairs of legs, antennae absent…. .…. ..Class Arachnida; spiders, ticks, scorpions, mites 3b. Has 5 or more pairs of legs; one or two pair of antennae…………………………………….4 4a. Elongated body with numerous segments; a pair of legs associated with each segment distinct head with mouthparts……………………. ..…. .Class Chilopoda; centipedes 4b. Elongated or rounded body with 2-3 specialized regions (head, thorax, abdomen), legs specialized for eating, walking, defense, etc………………………Class Crustacea; crabs, shrimp, lobsters, crayfish
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This note was uploaded on 11/16/2011 for the course BIOL 107 taught by Professor Abbot during the Spring '08 term at UConn.

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