Arthropods are characterised by the possession of a segmented body with appendages on each segment. They have a dorsal heart and a ventral nervous system. All arthropods are covered by a hard exoskeleton made of chitin, a polysaccharide, which provides physical protection and resistance to desiccation. Periodically, an arthropod sheds this covering when it moults.
2007-05-15 01:55:28
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answer #1
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answered by ? 7
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Arthropods (Phylum Arthropoda, from the Greek ,''arthro'' meaning joint and ''poda'', meaning foot) are the largest phylum of animals and include the insects, arachnids, crustaceans, and others. More than 80% of described living animal species are arthropods [1], with over a million modern species described and a fossil record reaching back to the late proterozoic era. Arthropods are common throughout marine, freshwater, terrestrial, and even aerial environments, as well as including various symbiotic and parasitic forms. They range in size from microscopic plankton (~¼ mm) up to forms several metres long. The largest living arthropod is the Japanese spider crab, with a leg span up to 3½ m (12 ft), and some prehistoric arthropods were even larger, such as Pterygotus and Arthropleura.
Arthropods are characterised by the possession of a segmented body with appendages on each segment. They have a dorsal heart and a ventral nervous system. All arthropods are covered by a hard exoskeleton made of chitin, a polysaccharide, which provides physical protection and resistance to desiccation. Periodically, an arthropod sheds this covering when it moults.
2007-05-15 23:39:05
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answer #2
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answered by tejas92 3
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what i feel it cannot be ATHROPODS rather it should be ARTHROPODS
so first u go and check ur spelling
(032407g) Fossilized Trilobite - Arthropod
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Extinct Sea creatures similar to present day horseshoe crabs. They had Hard Exoskeletons with many multi-jointed Legs. These were the Predominant animals of the Palaeozoic Era.(600-225 million yrs ago). There were thousands of different species and these animals were the first ones on Earth to have highly developed vision, as evident from the compound eyes that are amazingly preserved in some of the species. There are so many different types of trilobites that there are collectors who concentrate their entire collecting to only trilobites.
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ARTHROPODS (Insects, Spiders, etc.)
The Arthropod phylum -- all those animals who possess external skeletons (composed of chitin -- a cellulose that forms a strong yet somewhat flexible shell), with segmented bodies and jointed legs (insects, spiders, scorpions, crustaceans, centipedes, etc.) -- is far more diverse than are members of the chordate phylum to which all vertebrates including humans belong. Indeed, the number of Arthropod species is far greater than those of all other phyla combined, and there are probably millions of species among the insects alone which have not yet even been identified and described.
Moreover, the importance of the Arthropods to our ecosystems is huge, despite their individually small sizes, and they may well be considered the most successful animals on the planet -- ancient and contemporary inhabitants of sea, land, and air. The Trilobites of the Cambrian Period (540 MYA) and later Paleozoic are perhaps the best-known ancestral form.
2007-05-15 07:06:35
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answer #3
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answered by aleena the pari 2
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Arthropods (Phylum Arthropoda, from the Greek, meaning joint and , meaning foot) are the largest phylum of animals and include the insects, arachnids, crustaceans, and others.
Arthropods are characterised by the possession of a segmented body with appendages on each segment. They have a dorsal heart and a ventral nervous system. All arthropods are covered by a hard exoskeleton made of chitin, a polysaccharide, which provides physical protection and resistance to desiccation. Periodically, an arthropod sheds this covering when it moults
2007-05-15 01:59:35
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answer #4
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answered by subhasri s 2
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Arthro means "joint" and pod means " foot" (greek origin)
they are the largest phylum of animals and include the insects, arachnids, crustaceans, and others.
Arthropods are characterised by the possession of a segmented body with appendages on each segment.
2007-05-15 07:09:31
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answer #5
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answered by Anonymous
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An anthropod is a creature that walks upright - like a human.
An arthropod is an invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin - like a crayfish.
2007-05-15 02:37:27
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answer #6
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answered by elflaeda 7
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Arthropods are creatures with segmented bodies and jointed limbs, usually with a hard outer covering.Insects, crustaceans,and arachnids are all arthropods. Examples: beetles, lobsters, scorpions
Hope this helps
2007-05-15 02:00:16
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answer #7
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answered by SKCave 7
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Arthropods are a group of insects and other small animals with jointed legs.
2007-05-15 02:17:28
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answer #8
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answered by Anonymous
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8 legged organisms
2007-05-15 01:54:59
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answer #9
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answered by drvivekmahajan 3
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it is arthropods. it is from phyllum arthropoda that includes insects like cockroaches
2007-05-16 17:44:35
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answer #10
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answered by Pratik 2
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