The first terrestrial forms of arthropods appeared in the Palaeozoic, at the turn of the Silurian and Devonian ages some 400 million years ago. Today, arthropods form about 85% of all known animal species. They are characterized by segmentation of the body and limbs, reticulated paired appendages (antennae etc.), exoskeleton formed mainly of chitin, and bilateral symmetry.
CITATION STYLE
Hubálek, Z., & Rudolf, I. (2010). Haematophagous Arthropods as Vectors of Diseases. In Microbial Zoonoses and Sapronoses (pp. 51–81). Springer Netherlands. https://doi.org/10.1007/978-90-481-9657-9_6
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