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You are watching: Which is a feature of all arthropods?

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Insects and spiders space fascinating, from breakable butterflies to dancing honeybees and fuzzy tarantulas. However how much do you yes, really know around their behavior and origins?

The phylum Arthropoda is frequently divided into 4 subphyla of extant forms: Chelicerata (arachnids), Crustacea (crustaceans), Hexapoda (insects and also springtails), and Myriapoda (millipedes and also centipedes). Some zoologists believe that arthropods possessing only single-branched appendages, particularly the insects, centipedes, and also millipedes, progressed from a different ancestor and therefore group them in ~ a different phylum—the Uniramia, or Atelocerata; however, in this treatment these develops are dispersed among several subphyla. In addition, the phylum Arthropoda includes the extinct subphylum Trilobitomorpha. This team is made up of the trilobites, the leading arthropods in the at an early stage Paleozoic seas (541.0 million to 251.9 million years ago). Trilobites came to be extinct during the Permian duration (298.9 million come 251.9 million year ago) in ~ the finish of the Paleozoic Era.

The myriapods (centipedes, symphylans, millipedes, and pauropods) live in ~ stones and logs and in leaf mold; insects are found in all species of terrestrial habitats and some have invaded new water. The sea has actually remained the domain that the crustaceans, however, and also only in ~ its an extremely edges space insects (subphylum Hexapoda) found.

A south African millipede.

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The subphylum Crustacea consists of mostly naval arthropods, though many of that is members, such together the crayfish, have invaded new water, and also one group, the pill bugs (sow bugs), has become terrestrial, living beneath stones and also logs and in leaf mold. In the sea, huge crustaceans such as crabs and also shrimps are typical bottom-dwelling arthropods. Countless minute varieties of crustaceans (particularly the copepods) are critical component that the zooplankton (floating or weakly swimming animals) and also serve as food for other invertebrates, fishes, and even whales.