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Arthropods are easily the most diverse group of animals on the planet. The number of insects alone is greater than all the other animals combined. The fossil record shows a similar trend (at least for some groups): the number of trilobite species is greater than 10,000.
ARTHROPODS OF MEDICAL IMPORTANCE IN OHIO CHARLES O. MASTERS Sanitarian, Licking and Knox Counties, Ohio It is rather difficult to state with authority that arthropods, which make up about 86 percent of the world's animal species, are not of medical importance in the state of Ohio.
Biol 206 - Zoology Lecture Handout - Arthopods Phylum Arthropoda Overview: Most abundant and diverse of any group of animals on Earth; over 1,000,000 spp. known. Eucoelomate protostomes, organ-system level of development. Exoskeleton of chitin (nitrogenous polysaccharide).
animals on the planet are the arthropods. They have conquered land, sea and air, and make up over three-fourths of all currently known living and fossil organisms, or over one million species in all.
An overview of morphological features of the different Classes of arthropods and Orders of insects, with photos of Italian arthropods by Alessandro Strano.