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The Class Malacostraca

The Class Malacostraca - inches(25 cm Centipedes have...

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The Class Malacostraca The class Malacostraca is the largest taxonomic class of Crustaceans, having over 20,000 primarily marine species. Some malacostracans are freshwater, while others occupy diverse terrestrial habitats. Typical malacostracans include sowbugs, krill, and a very large order, the Decapoda, that contains many kinds of shrimp, crabs, and crayfish. Malacostracans typically possess a body with eight thoracic and six abdominal body segments, each bearing a pair of appendages. Class Malacostraca contains a number of economically significant species, such as edible lobsters, shrimp, crayfish and crabs. Many malacostracans contribute to plankton and as such are at the base of an immensely important marine food chain. The Class Chilopoda This taxonomic class includes 20 families and more than 2500 species of centipedes, all terrestrial. Most centipedes are small, but a few can attain a length of up to 10
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Unformatted text preview: inches (25 cm). Centipedes have bodies are made up of a chain of many (up to 177) flattened segments. With the exception of the segment behind the head and the last body segment, each segment has a single pair of appendages (legs). The appendages of the first body segment have been modified to form large, poisonous fangs that are used to capture prey. The bite of a large centipede, however, can be painful to an adult and dangerous to a small child. The Class Diplopoda Millipedes, Figure 20, comprise this class containing some 8000 species. Bodies of members of this class are made up of numerous segments. Millipedes lack poisonous fangs and do not bite. Prerdators are discoraged by the millipede's rolling into a defensive ball. Production of poisonous or foul-smelling substances also serve to disuade any would be predators. Most millipedes are apt burrowing herbivores or scavengers....
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The Class Malacostraca - inches(25 cm Centipedes have...

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