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Phylum Arthropoda - Arthropods

Stink Bug nymph eating a caterpillar - Podisus Eggs on Basswood Tree Diplotaxis frondicola (Say) - Diplotaxis frondicola Soldier - Stratiomys Hemiptera - Podisus maculiventris - female bee 75 - Holcopasites stevensi Reddish bark beetle - Xylosandrus crassiusculus Viceroy Caterpillar - Limenitis archippus
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Other Common Names
Insects
Bugs
Explanation of Names
from the Greek arthron (αρθρον)- "joint" + podos (ποδος)- "of foot, leg"; refers to the jointed legs of all members in the phylum
Numbers
Worldwide: (1)
17 classes
99 orders
About 2140 families
About 1.1 million described species (plus many more undescribed)
Size
ranges from the smallest mite (about 0.10 mm) and the smallest insect (a Hymenopteran, Dicopomorpha echmepterygis at 0.139 mm), up to the King Crab (legspan more than 3.5 m)
most species of Arthropods are in the range 2-25 mm (or 1/12th to 1 inch)
Identification
Three or more pairs of jointed legs
Segmented body
Bilaterally symmetrical
Possessing an exoskeleton, usually tough, composed in part of chitin (1)
See BugGuide Glossary for terminology.
Range
Cosmopolitan
Habitat
Almost every habitat.
Remarks
Arachnida, Merostomata, and Pycnogonida belong to subphylum Chelicerata.
Insecta, Collembola, Diplura, Protura belong to subphylum Hexapoda.
Chilopoda, Diplopoda, Symphyla, Pauropoda belong to subphylum Myriapoda.
Branchiopoda, Malacostraca, Maxillopoda, and Ostracoda belong to subphylum Crustacea.
Print References
Borror and White (2)
Internet References
Introduction to the Arthropoda - overview of fossil record, life history, ecology, systematics, and morphology (Ben Waggoner and Allen Collins, U. of California Museum of Paleontology)
Tree of Life - starting page of Arthropoda taxonomic tree, with representative images, many literature references, and links to more info (David Maddison, U. of Arizona)
Modern Systematics of Insects - includes complete hierarchial listing of all higher taxa of Arthropoda, plus links to discussions on systematics (N. Kluge, St. Petersburg State U., Russia)
Insect Morphology - excellent illustrated glossary (U. of Minnesota, adapted from U. of Sydney, Australia)
Works Cited
1.Animal: The Definitive Visual Guide to the World's Wildlife
Don E. Wilson, David Burnie. 2001. Dorling Kindersley Publishing.
2.A Field Guide to Insects
Richard E. White, Donald J. Borror, Roger Tory Peterson. 1998. Houghton Mifflin Co.