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Phylum Arthropoda - Arthropods

Immature Chinese Mantid - Tenodera sinensis - male Dot-lined White - Artace cribrarius We Evil? - Sphenophorus venatus Tachinid Fly - Belvosia Locust Borer Beetle (Megacullene robiniae) - Megacyllene robiniae Hairy Phyllophaga feasting on pine needles - Phyllophaga tarsalis Purseweb Spider  - Sphodros - female Ptenothrix? (2) - Ptenothrix renateae
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
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
15 classes
>120 orders
~2140 families [doesn't sound right, as Crustacea alone have >1000, Myriapoda close to 200, Arachnida and Hexapoda close to a thousand each, too... =v=]
>1.3 million described species (plus many more undescribed)
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), but most arthropods are in the range 2-25 mm
Three or more pairs of jointed legs (some mites have less, many insect larvae have none)
Body segmented, bilaterally symmetrical
Possessing an exoskeleton, usually tough, composed in part of chitin(2)
See Glossary for terminology.
Almost every habitat
Internet References
Introduction to the Arthropoda (Waggoner & Collins)
Tree of Life (Maddison 1995)
Insect Morphology (illustrated glossary)