Insects (from Latin insectum, a calque of Greek á¼âýÃâÿüÿý [éntomon], cut into sections) are a class of invertebrates within the arthropod phylum that have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae. They are among the most diverse groups of animals on the planet, including more than a million described species and representing more than half of all known living organisms.[2][3] The number of extant species is estimated at between six and ten million,[2][4][5] and potentially represent over 90% of the differing animal life forms on Earth.[6] Insects may be found in nearly all environments, although only a small number of species reside in the oceans, a habitat dominated by another arthropod group, crustaceans.
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進階授權 | WEL | 5184 x 3456 | JPG | 88 | |
進階授權 | PEL | 5184 x 3456 | JPG | 88 | |
進階授權 | UEL | 5184 x 3456 | JPG | 88 |
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標準授權 | 480 x 320 px | JPG | 13 點 |
標準授權 | 800 x 533 px | JPG | 15 點 |
標準授權 | 2121 x 1414 px | JPG | 18 點 |
標準授權 | 2738 x 1825 px | JPG | 20 點 |
標準授權 | 3464 x 2309 px | JPG | 22 點 |
標準授權 | 5184 x 3456 px | JPG | 23 點 |
標準授權 | 7331 x 4888 px | TIF | 39 點 |
進階授權 | 5184 x 3456 px | JPG | 88 點 |
進階授權 | 5184 x 3456 px | JPG | 88 點 |
進階授權 | 5184 x 3456 px | JPG | 88 點 |