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arthropod

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ar·thro·pod (ärthr-pd)
n.
Any of numerous invertebrate animals of the phylum Arthropoda, including insects, crustaceans, arachnids, and myriapods.

arthropod
[är′thrəpod′]
Etymology: Gk, arthron + pous, foot
a member of the Arthropoda, a large phylum of animal life that includes crabs and lobsters as well as mites, ticks, spiders, and insects. Arthropods generally are distinguished by a jointed exoskeleton (shell) and paired, jointed legs. They bite, sting, cause allergic reactions, and may serve as vectors for viruses and other disease-causing agents.

arthropod [ahr″thro-pod]
an individual of the phylum arthropoda.

arthropod
an individual of the phylum arthropoda.


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I don't know which dictionary Mr Fletcher uses, but in my dictionary an insect is defined as "any of a class of small air-breathing arthropod with a body divided into head, thorax and abdomen, three pairs of legs and (in most cases) two pairs of wings".
Hurdia, an early offshoot of the lineage that led to modern arthropods--the large group that contains insects, crustaceans, spiders, millipedes, and centipedes--had defining arthropod features such as compound eyes and limbs, revealing that the origins of these features go far back in time.
Hagadorn and Adolf Seilacher of Yale University studied arthropod trackways found in 500-million-year-old sandstone in central Wisconsin.
 
 
 
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