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Insecta is merely 1 class under the phylum arthropoda. The other classes are crustacea, arachnid, chilopoda, and diplopoda. Chilopoda and Diplopoda fit beneath the subphylum myriapoda.
An example of a class diplopoda is a millipede. Diplopoda means having two pair of legs.
It's an Arthropod.
It's an Arthropod.
Chilopoda and Diplopoda are placed with insects in the same subphylum. They are placed here because they have the same common ancestor. In addition, they have jointed limbs, antennae and exoskeletons, which is similar to insects.
There are not five clean cut classes of arthropoda. There are three classes under the subphylum Chelicerata, which are: Pycnogonida, Merostomata, and Arachnida. Then under the subphylum Mandibulata, there are three superclasses: Myriapoda, Crustacea, and Hexapoda. Myriapoda has four classes: Chilopoda, Diplopoda, Pauropoda, and Symphyla. Crustacea have six classes: Ostracoda, Maxillopoda, Remipedia, Cephalocarida, Branchiopoda, and Malacostraca. The Hexapoda superclass has four classes: Collembola, Protura, Diplura, and Insecta.
The most obvious answer is the Chilopoda, the centipedes. The Diplopoda or millipedes seem to have two pairs of legs per segment, though actually that is because their real segments are joined in twos so that what looks like one segment really is a double segment and therefore bears four legs.
Phylum Arthropoda hosts at least eighteen classes, (not counting those yet to be fully classified): Trilobita - trilobites (extinct) Arachnida - Spiders, scorpions, etc. Merostomata - horseshoe crabs, eurypterids (extinct), etc. Pycnogonida - sea spiders Chilopoda - centipedes Diplopoda - millipedes Pauropoda - sister group to millipedes Symphyla - resemble centipedes Branchiopoda - brine shrimp etc. Remipedia - blind crustaceans Cephalocarida - horseshoe shrimp Maxillopoda - barnacles, copepods, fish lice, etc. Ostracoda - seed shrimp Malacostraca - lobsters, crabs, shrimp, etc. Insecta - insects Entognatha - wingless Camptophyllia (extinct) Marrellomorpha (with one extinct species)
Phylum Arthropoda (Arthropods)Body composed of head, thorax and abdomen with three or more pairs of jointed legs; chitinous exoskeleton covering all body parts, molted at intervals; divided into seven major classes: Class Onychophora (walking worms); Class Crustacea (shrimp, crabs & barnacles); Class Insecta (insects); Class Chilopoda (centipedes); Class Diplopoda (millipedes); Class Arachnida (Spiders & ticks); and Class Merostomata (horseshoe crabs).
Insects are definitely members of the animal kingdom. The animal kingdom is broken down into groups called Phyla. The Phylum insects are classified in is Arthropoda (root words arthro- (joint) and pod- (foot or leg) meaning "jointed leg"). Insects are further classified in Subphylum Hexapoda (root words hexa- (six) and pod- (feet or leg) meaning "six legs") and Class Insecta. Other arthropods include Subphylum Chelicerata with Class Arachnida (spiders and scorpions), Class Merostomata (horseshoe crabs), Subphylum Myriapoda with Class Chilopoda (centipedes) and Class Diplopoda (millipedes), Subphylum Crustacea with Class Malacostraca (lobsters, crabs, shrimp), just to give a few examples.
Note that in some texts the subphyla may be referred to as classes; occasionally the taxonomic discipline appears somewhat fluid. Arthropoda has subphyla Chelicerata, Myriapoda, Crustacea, and Hexapoda. (There is also an extinct class Marrellomorpha and an the extinct Trilobite subphylum). The chelicerata, like spiders, scorpions, mites, etc., get their name from having appendages appear before the mouth; myriapods like centipedes and millipedes characterized by a high count of body segments and legs; crustaceans like crabs, shrimp, woodlice characterized by their biramous (two-part) limbs and a specialized larval form; hexapoda named for their consolidated thorax with only three pairs of legs. Classes below phylum Arthropoda could be selected from these subphyla; for example classes Arachnida, Chilopoda, Branchiopod, Insecta, and Malacostraca - but there are many more classes.
Millipede belong to class Diplopoda of phyllum Arthropoda .