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Phylum Arthropoda - Arthropods

Furrow Spider - Larinioides patagiatus - female Syphrid Fly? - Palpada vinetorum - male Pearl Crescent? - Phyciodes tharos - female Family Taeniopterygidae - Winter Stoneflies 6720 – Lytrosis unitaria – Common Lytrosis - Lytrosis unitaria native honesuckle leaf miner, under side of leaf - Phyllonorycter ID request Moth - Eumorpha pandorus
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 Japanese Spider Crab (legspan to 3.8 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)