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Arthropods are typically classified into five subphyla, four of which are extant - trilobites are a group of formerly numerous marine animals that died in the mass extinction at the end of the Permian-Triassic extinction event. Chelicerates include spiders, mites, scorpions and related organisms. They are characterised by the presence of chelicerae. Myriapods comprise millipedes and centipedes and their relatives and have many body segments, each bearing one or two pairs of legs. They are sometimes grouped with the hexapods. Hexapods comprise insects and three small orders of insect-like animals with six thoracic legs. They are sometimes grouped with the myriapods, in a group called Uniramia, though genetic evidence tends to support a closer relationship between hexapods and crustaceans.
Crustaceans are primarily marine (a notable exception being woodlice) and are characterised by having biramous appendages. They include lobsters, crabs, barnacles, and many others. They live anywhere lolol

2006-09-07 13:03:39 · answer #1 · answered by ★HigHTƹcH★ 7 · 0 0

Arthropoda (ärthrŏp'ədə) [Gr.,=jointed feet], largest and most diverse animal phylum. The arthropods include crustaceans, insects, centipedes, millipedes, symphylans, pauropodans, and the extinct trilobites. Arthropods are characterized by a segmented body covered by a jointed external skeleton (exoskeleton), with paired jointed appendages on each segment; a complex nervous system with a dorsal brain, connective nerves passing around the anterior end of the digestive tract, and a ventral nerve cord with a ganglion in each body segment; an open circulatory system with a dorsal heart into which blood flows through paired openings (ostia); and a greatly reduced body cavity (coelom). Because the jointed exoskeleton blocks growth of the organism, it must be shed periodically. This phenomenon, called molting, or ecdysis, is a characteristic feature of the phylum; it permits rapid growth in size and significant change in body form until the new exoskeleton, secreted by the animal, has hardened. Arthropods are mainly terrestrial, but aquatic representatives are well known. There are three subphyla, comprising nine classes.

2006-09-08 04:58:58 · answer #2 · answered by Anonymous · 0 0

Nobody said it simply.

Arthropods are all the creatures with a hard exoskeleton, segmented body and segmented legs.

So, when you ask where they live - they live everywhere.

Even the tiny mites that eat dried skin off your body are arthropods, so these critters live on you.

If you are unlucky enough to have fleas or lice, there's even more living on you.

2006-09-07 13:34:06 · answer #3 · answered by nick s 6 · 0 0

"Arthropods are the largest phylum of animals and include the insects, arachnids, crustaceans, and others. More than 80% of described living animal species are arthropods."

knowing that, i guess they can live anywhere from forests and woodlands to the ocean.

2006-09-07 13:01:10 · answer #4 · answered by ✠TotalTechMasta✠ 4 · 0 0

Everywhere! From the depths of the sea to the heights of the mountains!

2006-09-07 12:57:56 · answer #5 · answered by Shadow 3 · 0 0

all over, like he said

2006-09-07 13:01:01 · answer #6 · answered by loon_mallet_wielder 5 · 0 0

in a shell???

2006-09-07 12:56:36 · answer #7 · answered by Anonymous · 0 0

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